Tools Studio (574)
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Cycling Tools
7 toolsFixed Gear and Skid Patch Calculator
Fixed gear physics: calculate skid patches, gear inches, and optimize your rear tire wear for elite 400-600 word urban riding.
Bicycle Gear and Cadence Calculator
Precision drivetrain engineering: visualize gear overlaps, prevent cross-chaining, and optimize your pedaling with professional 400-600 word tools.
Bicycle Spoke Length Calculator
Absolute mechanical precision for your wheelbuilds: PCD, ERD, and cross patterns. Calculate the exact length for any hub and rim.
Tire Pressure Calculator for Cyclists
Professional tire pressure calculator for road, gravel, and MTB bikes. Optimize your setup with real-time pressure recommendations based on weight, discipline, and terrain.
Bicycle Chain Length Calculator for Road and MTB
Calculate bicycle chain length from chainstay, largest chainring, and largest cassette cog. Get an even link count, millimeters, and a largest to largest bench check for 1x, 2x, singlespeed, and full suspension bikes.
Bicycle Saddle Height Calculator for Road MTB and Gravel
Estimate a bicycle saddle height from your inseam, bike style, and crank length. Get a measured starting point, a practical adjustment range, and a visual setup check for road, gravel, mountain, and time trial bikes.
Bike Crank Length Fit Calculator
Estimate a starting bicycle crank length from inseam, height, and riding discipline. Compare a practical range of commercial crank sizes without treating the result as a clinical bike fit.
Pet Tools
6 toolsPet Age Calculator
Discover your dog or cat's true age in human years. Forget the "multiply by 7 rule." Use our calculator based on current veterinary science for precise results.
Pet Daily Ration Calculator
Calculate the exact amount of food your dog or cat needs. Tool based on veterinary RER and DER formulas for a healthy weight.
Pet Gestation Calculator
Estimate a dog, cat, rabbit, or ferret delivery date from the mating date, with a documented range and a clear reminder that veterinary care comes first.
Pet Food Toxicity Checker
Check common food exposures for dogs and cats, understand the main warning signs, and know when to contact a veterinarian or animal poison service.
Dog and Cat Water Intake Calculator
Estimate daily water needs for a dog or cat from body weight, diet, activity, and heat context, with a clear guide to total water and bowl drinking.
Pet Carrier Crate Size Planner
Estimate practical internal carrier dimensions for a dog or cat from six measurements, with a separate air travel review and a clear comfort checklist.
Alcohol and Party Utilities
9 toolsHangover & BAC Calculator: Recovery Predictor
Calculate your Blood Alcohol Content (BAC) and time to reach 0.0 using Widmark's formula. Plan your pre-sleep hydration and know when you'll be fully recovered.
Beer Cooling Calculator with Newton's Law
Calculate with real thermodynamics - Newton's Law of Cooling - exactly how long your beer needs to reach the perfect serving temperature in the fridge or freezer.
Beer Carbonation & Priming Calculator
Calculate the exact grams of Dextrose, Table Sugar or DME (Dry Malt Extract) for bottling your homebrew. Enter your volume, fermentation temperature and style for a perfect priming.
Cocktail Balancer: The Sour Law
Calculate the perfect balance between sweet and sour for your cocktails. Master the golden ratio of mixology.
Party Beer Calculator: Amount Per Person for Weddings & Birthdays
Free tool to calculate how much beer and ice you need based on guests, duration and temperature. Perfect for weddings, birthdays and outdoor events.
Jello Shot Lab: The Perfect Gelatin and Alcohol Ratio Calculator
Calculate exactly how much spirit and gelatin to use for jello shots that actually set. Avoid the runny or rubbery failures with science-backed ratios for any spirit strength.
Fortified Wine & Vermouth Builder: Pearson Square Calculator
Calculate exactly how much spirit to add to your wine to reach your target ABV. Craft perfect vermouth, port, and sherry with the Pearson Square method.
ABV Dilution Calculator and Proof Converter
Calculate how much water to add when reducing a spirit to a target ABV or proof. The offline calculator shows final volume, pure alcohol, and the dilution ratio.
Beer Mash Efficiency Calculator
Calculate mash efficiency percentage, potential sugar extraction, and expected specific gravity for homebrewing and craft brewing recipes.
Aquarium Tools and Calculators
1 toolAstronomy Tools
5 toolsDark Sky Simulator (Bortle Scale)
Interactively visualize the 9 levels of the Bortle Scale and discover how light pollution erases the starry night sky.
Telescope Reach Calculator
Calculate the limiting magnitude of your telescope and discover which deep sky objects are visible with your equipment under your sky conditions.
500 Rule and NPF Astrophotography Calculator
Calculate the maximum exposure time for astrophotography without star trails. Classic 500 rule and high-precision NPF model for modern sensors.
Telescope Resolution Calculator (Dawes Limit)
Calculate the resolving power of your telescope with the Dawes Limit and Rayleigh Criterion. Discover the maximum useful magnification and the impact of atmospheric seeing.
Eyepiece Calculator & Visual Simulator
Calculate magnification, true field of view (TFOV), and exit pupil for any eyepiece with your telescope. Features an interactive visual simulator.
Audiovisual and Photography Tools
17 toolsChromatic Lens: Online Color Palette Extraction
Extract professional color palettes from any image for free. Identify dominant colors in your photos using mathematical algorithms.
Online Collage Maker: Design professional compositions
Create photo collages for free in seconds. Choose from multiple layouts, adjust borders, and download in high quality without watermarks.
EXIF Metadata Cleaner: Remove GPS and Hidden Data from Photos
Free online tool to erase EXIF metadata, GPS coordinates, and camera specs from your images before sharing. 100% private: works without uploading photos to the internet.
Online Image Compressor: Reduce weight without losing quality
Optimize and compress your JPG, PNG, and WebP photos for free. Reduce file size to improve your web loading speed locally.
Print Quality Calculator: Pixels to CM and DPI
Calculate the maximum print size of your photos based on their resolution. Convert pixels to centimeters and inches to ensure professional printing.
Online Privacy Editor: Pixelate and hide faces in photos
Protect your identity by censoring sensitive areas of your photos. Pixelate faces, blur documents, or cover private information 100% locally.
Synchronize SRT Subtitles Online: Adjust Timing for Free
Online tool to advance or delay SRT subtitles. Correct timing offset easily and download the synchronized file instantly.
Timelapse and Hyperlapse Calculator: Perfect Intervals
Calculate the exact interval between photos, total duration, and storage for your timelapses. Essential tool for photographers.
TV Distance Calculator: THX and 4K Optimal Screen
Calculate the ideal distance to watch your television based on its size and resolution. Optimize your Home Cinema with THX and SMPTE standards.
Video Frame Extractor: Capture HD stills
Extract individual images from your videos with frame-perfect precision. Capture perfect moments in HD locally and for free.
Depth of Field Calculator: Realtime DoF for Any Camera
Calculate depth of field, hyperfocal distance, and near/far focus limits in real time. Supports all sensor sizes with 1/3 stop aperture precision.
Merge Videos Online: Join multiple videos fast and free
Merge and concatenate multiple videos into one for free, online, and locally. No watermarks, no uploads, 100% private in your browser.
Audio Delay by Distance and Temperature Calculator
Calculate acoustic delay time, speed of sound in air, phase offset, digital samples, and SPL loss for live PA delay towers.
Equivalent Exposure Calculator: Exposure Triangle Reciprocals
Calculate equivalent camera exposure settings across Aperture, Shutter Speed, and ISO to maintain consistent EV with creative control.
Ansel Adams Zone System Visualizer
Explore Zones 0 to IX, place a measured tone with exact stop changes, and connect exposure decisions with normal, minus, and plus development.
Film Development Time Calculator by Temperature
Adjust a documented black and white film development time to the temperature in your tank, with a clear reference band around the reading.
Film Reciprocity Failure Calculator
Correct long film exposures with manufacturer factors, compare metered and adjusted time, and plan a more reliable darkroom exposure.
Baby Calculators
9 toolsBaby Feeding Calculator
Calculate how much milk your baby needs based on weight and age. Recommended feeds, milliliters per feed, and hunger and fullness cues.
Ultimate Baby Budget Planner
The definitive tool to plan your baby's first year expenses. Calculate nursery setup, monthly costs, and hidden expenses with smart saving tips.
WHO Percentile Calculator for Babies
Calculate your baby's weight, height and BMI percentile using WHO growth charts (0-5 years).
Baby Size Converter
Convert baby clothing sizes between Zara, H&M, Primark, Carter's, Kiabi, Mango, and Mayoral. Enter your baby's height and weight to get the exact size for each brand.
Fertile Days Calculator
Calculate your fertile window and ovulation date based on your menstrual cycle.
Pregnancy Weeks Calculator
Calculate exactly which week of pregnancy you are in, your trimester, and your estimated due date.
Pregnancy Weight Gain Calculator
Estimate a healthy pregnancy weight gain range by gestational week using IOM and ACOG prenatal weight gain guidance.
Labor Contraction Timer
Track contraction duration and frequency with a large touch button, guided breathing, history, and a 5-1-1 pattern alert.
Baby Vaccination Calendar in Spain
Calculate the exact vaccination dates for your baby according to the AEP 2026 schedule.
Online Image Converters
24 toolsConvert AVIF to JPG Online
Convert AVIF images to JPG in your browser. No server. 100% private local processing. Free and unlimited.
Convert AVIF to PNG Online
Convert AVIF images to PNG preserving transparency. No file uploads. Processed locally in your browser. Free and unlimited.
Convert AVIF to WebP Online
Convert AVIF images to WebP with better compatibility. Local processing without servers. Free, private and unlimited.
Convert BMP to JPG Online
Convert BMP images to JPG in your browser. Drastically reduce file size. No file uploads to servers. Free and 100% private.
BMP to PNG Converter
Convert BMP images to PNG without quality loss. Modern compression without artifacts. No file uploads. Free and 100% private.
Convert BMP to WebP Free
Convert BMP images to WebP offline. Reduce huge files to kilobytes. No file uploads. Free, offline and completely private.
Convert GIF to JPG Online
Extract the first frame of your GIFs and convert to JPG. No server. Processed locally in your browser. Free and unlimited.
Convert GIF to PNG Online
Extract the first frame of your GIFs and convert to PNG preserving transparency. No server. Local processing. Free.
Convert GIF to Static WebP
Convert animated GIFs to static WebP. Preserves transparency. No server. Processed locally in your browser. Free.
Image to Base64 Converter Online
Convert any image to Base64 code and Data URI directly in your browser. No file uploads. Free, private and instant.
JPG to ICO Converter
Convert JPG photos to ICO with real Microsoft binary headers. Automatic square crop. No file uploads. Free and private.
Convert JPG to PNG Online and Free
Convert JPG images to PNG in your browser without uploading files. Lossless conversion, free and completely private.
Convert JPG to WebP Online and Free
Convert JPG images to WebP in your browser. Superior compression without visible loss. No file uploads. Free, unlimited and private.
Convert PNG to ICO Online
Convert PNG to ICO with real binary headers. Transparencies preserved. No file uploads. Free and 100% private.
Convert PNG to JPG Online
Convert PNG images to JPG format directly in your browser. No server uploads. Fast batch image optimization and guaranteed privacy.
Convert PNG to WebP Online and Free
Convert PNG images to WebP in your browser. Up to 40% less file size. Preserves transparency. No file uploads. Free and private.
Convert SVG to JPG Online and Free
Convert SVG vector files to JPG in your browser. 2x high resolution rendering. No file uploads. Free and 100% private.
Convert SVG to PNG Online and Free
Convert SVG vector files to PNG in your browser. Double-scale HD output. Preserves transparency. Free and 100% private.
Convert WebP to ICO
Convert WebP images to official ICO with transparency. No file uploads. Real Microsoft binary headers. Free and private.
Convert WebP to JPG Online and Free
Convert WebP images to JPG without uploading files. 100% private local processing. Transparent backgrounds are automatically replaced with white.
Convert WebP to PNG Online and Free
Convert WebP images to PNG in your browser. Preserves transparency. No file uploads to servers. Free and 100% private.
JPG to PDF Converter
Turn JPG images into an ordered PDF in your browser. Choose paper size, orientation and margins without uploading files.
PNG to PDF Converter
Turn PNG images into an ordered PDF in your browser. Keep transparent artwork readable on paper without uploading files.
WebP to PDF Converter
Turn WebP images into an ordered PDF in your browser. Set paper size, orientation and margins without uploading files.
Precision Cooking Tools and Calculators
33 toolsUS Cooking Conversion Calculator: Cups to Grams
Convert cups, tablespoons, and Fahrenheit to the metric system. Your professional compass for decoding American recipes with absolute precision.
Banana Diagnostics and Conservation: Scientific Guide
Analyze your banana ripening stage with scientific precision. Learn conservation techniques, ethylene biochemistry, and nutritional optimization.
Equilibrium Brining and Fermentation Calculator
Master the science of equilibrium brining for juicy meats and perfect fermentations. Calculate exact salinity based on total product and water weight.
Smart Cookware Selector: Kitchen Utensils Guide
Interactive guide to choose the best pan or pot based on your cooking style. Iron vs Stainless Steel vs Teflon. Find your perfect tool.
Precision Scientific Egg Timer and Altitude Calculator
Master the thermodynamics of the perfect egg. Calculate exact boiling times based on your altitude, egg size, and initial temperature.
Professional Recipe Ingredient Scaler
Automatically scale your recipes based on serving count. Calculate exact ingredient amounts to multiply or reduce any recipe with professional precision.
Multiple Kitchen Timer
Manage multiple cooking times simultaneously. Independent alarms, ideal for chefs and kitchen organization (Mise en Place).
Professional Meringue Sugar Ratio Calculator
Calculate the exact amount of sugar for French, Italian, or Swiss meringue based on your egg whites' weight. Mastering stiff peaks with professional precision.
Cake Pan Size Converter and Baking Scaler
Scale any baking recipe to your pans instantly. Calculate the conversion factor for round, square, and rectangular molds with professional precision.
Neapolitan Pizza Dough Calculator
Calculate the exact proportions of flour, water, salt and yeast to prepare authentic Neapolitan pizza at home with professional results.
Professional Roux Ratio Calculator and Sauce Guide
Master the foundation of French mother sauces. Calculate exact roux proportions for Béchamel, Velouté, and Espagnole with professional accuracy.
Sourdough Starter Feeding Calculator
Automatically calculate exact proportions of starter, flour, and water for your sourdough maintenance and feeding. Preset or custom ratios available.
Yeast Converter: Fresh, Dry & Sourdough Starter
Convert between fresh yeast, dry yeast, and sourdough starter with precision. Get recipe adjustments when using sourdough starter to maintain perfect hydration.
Yeast Fermentation Time Calculator for Bread, Sourdough and Beer
Estimate bread proofing time, sourdough fermentation time and beer fermentation time from temperature, yeast amount, batch size and target rise or attenuation. Switch between metric and imperial units and see the assumptions behind the range.
Lacto Fermentation Salt Calculator
Calculate precise salt percentages for dry salting and wet brining. Balance bacteria populations, prevent mold, and master food preservation.
Spherification Bath Calculator
Calculate exact ratios of sodium alginate and calcium lactate for direct and reverse spherification. Correct viscosity and acidity with xanthan and citrate.
Ice Cream PAC POD Calculator
Calculate anti-freezing power and sweetening power for ice cream. Formulate precise sugar profiles, solid percentage, and service temperatures.
Botulism Canning Safety Checker
Calculate thermal spore reduction and F0 sterilization lethality for Clostridium botulinum. Assess low acid and acidic canning safety zones.
Meat Binder Transglutaminase Calculator
Calculate precise transglutaminase (TG) dosage for meat binding. Get dry dusting or slurry ratios, incubation time, and temperature safety alerts.
Carry Over Cooking Predictor
Predict how many degrees your roast will continue cooking after you pull it from the oven. Get the exact pull temperature for a perfect medium rare.
Maillard Reaction Optimizer
Calculate exactly how much baking soda to add per kilo of food to accelerate the Maillard reaction. Avoid soapy flavors by staying within safe alkalinity limits.
Macaron Shell Drying Predictor
Calculate exactly how long macaron shells need to dry based on humidity, temperature, and shell size. Avoid cracked shells and ensure perfect feet every time.
Brix Sorbet Density Calculator
Dial in the exact sugar, fruit purée, and water balance for scoopable sorbet every time. Fix icy or soupy texture with precise Brix and PAC calculations.
Oil Smoke Point Tracker
Monitor deep frying oil quality and estimate current smoke point declines. Track uses, temperatures, and food types to prevent harmful polar compound accumulation.
Leavener Acid Neutralizer
Calculate the exact baking soda and baking powder ratio for your recipe. Neutralize acidic ingredients like buttermilk and yogurt, avoid metallic aftertaste, and achieve perfect rise every time.
Pectin & Jam Setting Calculator
Calculate exactly how much pectin, citric acid, and sugar your fruit needs to achieve the perfect jam set - no more runny or rubbery preserves.
Sous Vide Pasteurization Curves
Calculate the exact time needed for safe core pasteurization against Salmonella and Listeria in sous vide cooking, factoring in meat shape and thickness.
Emulsion Stability and Oil Limit Calculator
Find out exactly how much oil your mayonnaise, aioli, or vinaigrette can handle before it breaks. Prevent split sauces with our free emulsion stability calculator.
Koji Inoculation and Hydration Calculator
Calculate the perfect moisture content, spore inoculation dosage, and incubation temperature for making koji at home. Avoid failed batches with our free koji inoculation and hydration calculator.
Cheese Flocculation Multiplier Calculator
Find the exact moment to cut the curd in artisan cheesemaking. Use the flocculation multiplier method to calculate coagulation time, control moisture, and improve cheese yield with our free calculator.
Dehydrator Moisture Estimator
Estimate how much weight your food will lose in the dehydrator. Calculate drying time, water evaporation, and final moisture content based on ingredient type, temperature, and target moisture level.
Dry Aging Meat Yield and Cost Calculator
Calculate meat weight loss, pellicle trim waste, and actual cost per kilogram when dry aging beef or other meats at home or in a chamber.
Chocolate Tempering Curve and Seeding Guide
Master chocolate tempering at home. Calculate required seeding callets weight and follow step-by-step thermodynamic temperature curves for dark, milk, and white chocolate.
Creativity and Leisure
7 toolsPattern Generator
Create pixel art and bead schemes for Miyuki or Hama from your photos. Color quantization algorithm, tunnel vision mode, and ZIP export.
Dice Roller
A complete dice simulator for your RPG and board games. Roll d4, d6, d8, d10, d12, d20 and d100 with modifiers and history.
Excuse Generator
Semantic gambling machine to get rid of commitments with style. Generate surreal and irrefutable excuses instantly.
Fortune Cookie
Check your daily destiny and discover your lucky numbers. One fortune per day, revealed with a click.
Glitch Image Distorter
Transform images into glitch art with RGB splits, scanlines, pixel sorting, and animated distortions. No Photoshop needed.
Synesthesia Painter
Visualize the color of words according to grapheme-color synesthesia. Each letter has its own color, turning text into chromatic art.
Zalgo Generator
Corrupt your messages with cascading overflowing Unicode characters. Adjust intensity and direction of the glitch effect.
Drone and Ham Radio Tools and Calculators
8 toolsRF Antenna Length Calculator for FPV Dipoles and Whips
Calculate the exact measurement for your 868MHz, 2.4GHz, and 5.8GHz antennas. Improve your drone's range and avoid burning your transmitter with optimized SWR.
Drone Flight Time Calculator for LiPo LiIon Endurance Estimation
Calculate how long your drone can fly based on mAh capacity and current draw. Optimize your LiPo batteries for safe flights and maximum duration.
GPS Coordinates Converter from Decimal to DMS Online Free
Convert GPS coordinates from Decimal to Degrees, Minutes, and Seconds (DMS) instantly. Visual tool with map for drones, sailing, and geolocation.
Drone Power Analyzer: Thrust to Weight Ratio Calculator for FPV
Calculate the critical thrust-to-weight ratio for your FPV drone build. Get instant flight profile recommendations, visual power gauge, and optimize for cinematic, freestyle, or racing.
GSD Flight Planner: Ground Sample Distance Calculator
Calculate the Ground Sample Distance (GSD) for photogrammetry missions. Support for DJI, Autel, and custom cameras. Real-time flight planning with visual quality indicators.
Drone LiPo Battery C Rating and Continuous Discharge Calculator
Calculate continuous discharge current, realistic C rating, voltage sag, and flight safety for drone LiPo batteries based on internal resistance and quadcopter motor draw.
FPV Drone Thrust to Weight Ratio and Flight Telemetry Simulator
Simulate static thrust, non-linear throttle response curve, instant vertical G-force, hover throttle point, and 0-100 acceleration for FPV quadcopters and multirotors.
Drone Motor and Propeller Calculator
Estimate drone motor thrust, loaded RPM, propeller speed, power and current from KV, battery voltage, propeller geometry and aircraft weight.
Tools and Calculators for Students and Education
14 toolsCitation Generator
Create automatic references in APA, MLA, and Vancouver formats with persistent storage.
Weighted Grade & Final Score Calculator
Stop stressing over your GPA! Easily calculate your course grades and final marks. Just enter your assignments, exams, and their weights to see where you stand.
Pomodoro Flow
Master your productivity with zen-focused time management. Customize work/break cycles, track interruptions, and visualize your focus patterns in real-time.
International Grade Converter & GPA Equivalence Calculator
The most precise tool for converting academic grades between international systems. Instantly translate scores from Spain, USA, UK, Germany, France, Italy, and more. Essential for Erasmus+, Fulbright, and global university applications.
Transcript GPA Parser & Calculator
Instantly calculate your cumulative GPA and weighted grade average by copy-pasting your raw university transcript text. Works completely offline.
Exam Countdown & Study Session Predictor
Calculate your exact daily study pace to reach your exam day fully prepared. Enter your material size, set rest days, and generate a customized study calendar.
LaTeX Formula Renderer
Render LaTeX math expressions instantly in your browser. Type any formula and copy the result as a PNG image, a Markdown code block, or raw LaTeX source - no server needed.
University Finance Simulator
Model the real cost of college, compare scholarship scenarios, and project student-loan payments with a visual payoff timeline and amortization table.
Degree Credit Progress and Projected Grade Calculator
Build your degree structure semester by semester, track your real GPA, simulate projected grades, and calculate the exact average needed in remaining courses to reach your academic goals.
Interactive Flashcard Generator & Study Deck
Boost your study sessions with active recall and spaced repetition. Create custom flashcards, study with 3D card flips, score difficulty, and export/import decks.
Academic Schedule Optimizer
Build a visual weekly class schedule, color-code subjects, detect overlapping sessions, and export your timetable as an .ics calendar file.
Reading Time & Note Density Planner
Estimate how long academic reading will take once note-taking is included, then split the workload into practical study sessions.
Rubric Matrix Designer
Create editable weighted assessment rubrics with achievement levels, live 100% weighting validation, CSV export, and a print-ready layout.
Concept Map Text Exporter
Turn indented notes into an interactive concept map with draggable nodes, collapsible branches, zoom controls, and SVG or PNG export.
Viral Challenges & Games: Typing Test & Addictive Speed Challenges
3 toolsTyping Speed Test: Measure Your Writing Velocity
Fully offline typing test with addictive gamification. Measure your WPM, accuracy and achievements. Compete with yourself and improve your typing speed.
Mouse Sensitivity Converter Between Games
Match your physical mouse travel across competitive games. Convert hipfire sensitivity with separate DPI values, inspect cm per 360 and eDPI, then verify measured profiles in game.
Game FPS Hz Frame Time Planner
Compare game frame time with monitor refresh, VRR and VSync settings to understand where frames fit, repeat or risk tearing.
Game Development Utilities
13 toolsSteam Capsule & Art Preview Generator
Crop, preview, and format official Steam store capsules and library assets with live mockup inspection and safe zone verification.
Itch.io Web Game Inspector & Live Resolution Optimizer
Upload HTML5 export files or ZIP archives to test viewports live, fix aspect ratio scrollbars, inspect Godot and Unity WebGL builds, and generate copyable Itch.io dashboard embed settings.
Sprite Sheet Packer and Extractor
Optimize 2D game performance by packing loose animation frames into texture atlases or extracting individual sprites from existing sheets client-side.
Game Audio Loop Point Finder and Metadata Injector
Locate precise audio loop points, snap to zero crossings to eliminate clicks, and export WAV files embedded with LOOPSTART and LOOPEND metadata chunks for game engines.
Game Save File Obfuscator and Editor
Decrypt, inspect, edit JSON payloads, and re-encrypt game save files using Base64, XOR masking, or plain text 100% locally in your browser.
Godot and Unity Localization CSV Sanitizer
Inspect translation CSV or JSON files for empty cells, duplicate keys, and broken rows, then export a clean local copy ready for engine import.
Steam BBCode, Markdown and HTML Converter
Convert between Steam BBCode, Markdown, and HTML in both directions with automatic syntax detection, nested list support, and a live preview.
Retro Sound Effect Generator for Games
Create short retro game sound effects in your browser with instant presets, waveform controls, a live oscilloscope, and one-click WAV export.
Pixel Art Palette Swapper
Reduce sprites and spritesheets to classic console palettes or a custom set of hex colors directly in your browser.
Game UI Accessibility Stress Tester
Inspect a game screenshot locally with color vision simulations, HUD contrast probes, blur, downscale, edge collapse heatmaps, and exportable review findings.
Hitbox and Hurtbox Animator for Sprites
Draw collision layers on every sprite frame, preview them with onion skins, edit exact pixel coordinates, and export engine neutral JSON without uploading artwork.
Damage Formula Lab with TTK Charts
Compare safe game damage formulas through live curves, attack and defense heatmaps, rounding breakpoints, criticals, hits to kill, and time to kill.
Game Delta Time and Fixed Timestep Lab
Compare variable and fixed timestep game loops with repeatable frame spikes, simulated motion, catch up steps, and visible time drift.
Sailing & Nautical
8 toolsNautical Endurance Calculator
Calculate your maximum range and safe distance based on fuel consumption, tank capacity and cruise speed. Fuel management for motorboats.
Nautical Units Converter
Convert nautical miles, knots, fathoms and atmospheric pressure. Includes interactive Beaufort scale for wind speed.
Sail Area and SA/D Ratio Calculator
Calculate the total sail area and sail area to displacement ratio of your boat. Nautical performance analysis based on I, J, P and E measurements.
Nautical Speed Converter and Beaufort Scale
Convert between knots, km/h, m/s and mph instantly. Includes full Beaufort table with sea state descriptions and wind effects.
Tide Height Calculator
Estimate water depth at any point in the tidal cycle using the nautical Rule of Twelfths. Ideal for coastal planning and nautical licence study.
Under Keel Clearance Calculator
Calculate the safe time window to cross bars, channels or draft-restricted points. Enter your boat draft, chart depth and tidal data to get the exact safe passage interval.
Anchor Scope and Rode Calculator
Calculate the optimal anchor chain and rope length, scope ratio, and swing radius for safe anchoring based on water depth, bow height, tidal rise, and seabed conditions.
Sailboat Hull Speed Calculator
Find theoretical hull speed from waterline length, compare an observed speed, and see when a displacement hull is climbing its own bow wave.
Interactive Scientific Tools and Simulators
27 toolsAsteroid Impact Simulator: Apocalypse Calculator
Simulate asteroid impacts with real physics. Calculate energy, crater, thermal radiation and shockwave. Would you survive Chicxulub?
Cellular Renewal Calculator: How Much is Left of the Original "You"?
Calculate the percentage of your body that has renewed since birth. Estimates based on the cell division rate of organs, bones, and tissues. The Paradox of Theseus made tangible.
Colony Counter: Digital CFU Counting Tool for Petri Plates
Digital tool for counting bacterial colonies on Petri plates. Differentiate types, avoid errors, and calculate CFU with precision.
Microwave Leak Detector: WiFi Interference Visualizer
Analyze if your microwave is leaking radiation by measuring real-time interference on your WiFi network. A scientific safety tool.
Simulation Probability Calculator: Do You Live in a Virtual Universe?
Analyze if our reality is a simulation using Nick Bostrom's trilemma argument. Calculate existential probability with 4 key parameters.
Cosmic Inflation Calculator: Early Universe Expansion
Calculate the exponential expansion of the early universe during the cosmic inflationary epoch.
Planet Average Temperature Timeline: Geologic Climate History
Explore the average temperature history of Earth across geologic eras from the early Archean to the modern Anthropocene.
Lorenz Attractor Chaos Simulator: The Butterfly Effect in 3D
Explore chaos theory with this interactive 3D Lorenz attractor simulation. Visualize the butterfly effect by running two nearly identical trajectories side-by-side.
Stellar Habitable Zone Simulator: Find Goldilocks Zones
Calculate and visualize the habitable zones (Goldilocks zone) around different types of stars using stellar and planetary configurations.
Radioactive Decay Half Life Calculator
Simulate radioactive decay with isotope presets, half-life math, stochastic atom grids, remaining sample size, and activity estimates.
Natural Selection and Genetic Drift Simulator
See how selection pressure, mutation, drift, and reproduction change allele frequencies over time with an interactive evolution simulator that explains why populations adapt, diversify, or collapse.
Entropy and Second Law of Thermodynamics Simulator
Watch hot and cold particle chambers mix, equalize, and drive entropy upward with a visual diffusion simulator and live entropy graph.
Double Slit Experiment and Decoherence Simulator
Switch which-path detectors on and off to see quantum interference fade into two particle bands in a visual double slit simulator.
Phase Diagram and Critical Point Visualizer
Explore solid, liquid, gas, and supercritical regions on an interactive pressure-temperature phase diagram with triple point and critical point markers.
Twin Paradox Visualizer: Special Relativity Time Dilation
Visualize how special relativity makes a fast traveling twin return younger than the twin who stayed on Earth.
Mandelbrot Fractal Calculator and Self Similarity Explorer
Explore the Mandelbrot set, zoom into self-similar fractal boundaries, and compare iteration depth, color contrast, and complex-plane coordinates.
Planet Atmosphere Survival Calculator
How long can you survive without a spacesuit on Mars, Venus, Titan, Jupiter, or Everest? This interactive calculator estimates unprotected human survival time from pressure, temperature, oxygen, carbon dioxide, toxicity, and wind hazards.
Three Body Problem Simulator
Simulate three gravitational bodies in a two-dimensional plane with editable masses, velocity vectors, trails, and stable or chaotic presets.
Roche Limit Calculator and Satellite Disruption Simulator
Calculate the Roche limit for planets and moons, compare fluid and rigid breakup distances, and visualize how tidal forces turn a satellite into a ring system.
Dyson Sphere Energy Capture Simulator
Estimate Dyson swarm, ring, shell, and statite collector designs for different stars. Calculate capture power, orbital radius, material mass, and the coverage needed to reach a target Kardashev scale.
Global Albedo and Snowball Earth Simulator
Explore Earth thermal radiation balance, solar constant changes, greenhouse gas concentration, and ice-albedo feedback to see whether ice sheets retreat, stabilize, or trigger a snowball climate.
Conway Game of Life Rule Lab
Play, edit, and compare Conway-style cellular automata with B/S rules, pattern seeds, live metrics, and a responsive simulation board.
Crystal Lattice Structure Finder
Explore common metallic, ionic, covalent, and ceramic crystal structures with an interactive 3D viewer, packing factor, coordination number, and theoretical density calculator.
Fermi Paradox Filter Lab
Model the Fermi paradox with Drake equation inputs, evolutionary filters, signal lifetime, and a time projection of detectable Milky Way civilizations.
Epidemic SIR Simulator
Explore pathogen spread with an interactive SIR model that adjusts R0, lethality, vaccination, infectious period, peak burden, and transmission curves in real time.
Black Hole Event Horizon Simulator
Explore a black hole event horizon with interactive mass, orbit distance, time dilation, photon sphere, escape velocity, and Schwarzschild radius calculations.
Exoplanet Biosignature Detector
Align oxygen, methane, and ozone absorption lines in a simulated exoplanet transmission spectrum. Estimate biological habitability, possible technosignature contamination, and false-positive risk from spectral evidence.
Tools and Calculators for Travelers and Adventurers
7 toolsCarry on Luggage Calculator Airline Measurements 2026
Check the dimensions and weight allowed for your carry-on suitcase and personal item on Ryanair, Vueling, Iberia, and +30 airlines. Avoid surcharges!
Mini Adventure Forecast: Get Out of the Rut
Random daily challenge generator to break monotony and explore your surroundings.
Suitcase Checklist Generator Create your packing list
The ultimate online tool to organize your luggage based on trip type, destination, and duration. Never forget your travel essentials again.
International Tip Calculator
Calculate how much to tip on your trips. Includes percentage guide and etiquette rules for more than 50 countries. Don't mess up when paying!
Schengen 90/180 Visa Stay Calculator
Check if your planned European trip is legal under the 90/180 rolling visa rule. Calculate allowed stay days and avoid overstays with real-time border tracking.
Fuel Cost Calculator for Road Trips
Estimate the fuel cost of a drive from distance, vehicle consumption, manual pump price, passengers, and a one-way or round-trip route. Works in metric and imperial units without live price claims.
Trip Expense Splitter for Shared Travel Costs
Split shared trip expenses between travelers, see who paid too much or too little, and settle the group with the fewest practical transfers. Everything stays in your browser.
Textile Tools
13 toolsTextile Burn Test
Identify the real composition of any fabric by analyzing its burning behavior. Scientifically differentiate cotton, wool, silk and synthetics.
International Clothing Size Converter
Convert clothing sizes between EU, US, UK and IT systems. Shirts, pants, dresses and jackets for men, women and unisex. Includes measurement guide and brand fit recommendations.
Fabric Consumption Calculator by Garment
Easily calculate how much fabric you need to sew a skirt, trousers, a dress or a shirt. Adjust by fabric width and size for a professional cut.
Fabric Truthfulness: Textile Quality Analysis
Discover the real quality of your garments by analyzing their composition. Is it real cotton or expensive plastic? Scientific fiber analysis.
Fiber Preparation for Natural Dyeing
WOF calculator, mordanting protocols and thermal ramps to prepare wool, silk and cotton before natural dyeing.
Knitting Gauge Calculator
Easily recalculate stitches and rows for any knitting or crochet pattern. Adjust gauge by multiples and scale factor for a professional result.
Textile Care Guide: How to Wash Every Fabric Type
Scientific guide to washing and caring for cotton, wool, silk, linen, and synthetics. Prevent shrinkage, fading, and damage with proper care instructions.
Knitting and Crochet Needle Converter
Convert needle sizes between Metric (mm), US and UK systems with yarn weight recommendations and WPI.
Sewing Pattern Scaler Online
Adjust any sewing pattern to your real measurements. Differential scaling calculator with updated pattern preview.
International Shoe Size Converter
Convert shoe sizes between US, European (EU), UK and centimetre (CM) systems. Size guide for men and women.
Stain Chemical Protocol for Textiles
Scientific protocols to remove stains based on fiber type and the chemical nature of the stain. Percarbonate, enzymes, solvents: the right method for every case.
Yarn Calculator: How many metres and balls do I need?
Accurately calculate the amount of yarn needed for your knitting and crochet projects based on pattern and size.
Embroidery Stitch Count and Pricing Estimator
Estimate embroidery stitch count, production time, and a base price from design size, stitch density, colours, speed, and hourly rate.
Home Calculators and Utilities
17 toolsDew Point Calculator
Calculate the condensation temperature on your walls using ambient humidity and temperature. An essential tool for preventing dampness and protecting the structural health of your home.
Gas vs. Heat Pump vs. AC: Savings & Consumption Comparator
Calculate how much you save by switching your gas boiler for an air source heat pump or AC. Real consumption and efficiency comparison for your home.
LED Saving Calculator
Calculate how much money and kWh you save by switching your traditional bulbs to LED. Discover your exact annual and monthly savings plus CO2 reduction.
Projector Throw Distance Calculator
Calculate the exact distance to install your projector based on your desired screen size and Throw Ratio. Visual tool with real-time simulation.
Offline QR Code Generator
Generate QR codes for WiFi, URLs and Contacts 100% securely in your browser. Your data never leaves your device.
Solar Panel Tilt Angle Calculator
Calculate the optimal tilt angle for your solar panels based on your geographic latitude. Get values for fixed installations and seasonal adjustments.
Electricity Tariff Comparator: Fixed vs Variable Price
Find out which electricity tariff suits you best. Compare the regulated market (PVPC) vs the free market based on your consumption and save hundreds of euros on your electricity bill.
WiFi Range and Obstacle Simulator
Sketch your home layout, place walls, doors, furniture and appliances, then drag your router and device to find the best signal path. See live coverage loss, streaming verdicts and placement tips to fix dead zones without buying new hardware.
AC Tonnage and Cooling Capacity Calculator
Calculate the exact air conditioner size your room needs in BTUs, frigorias, and tons. Input room size, ceiling height, occupants, heat sources, and sun exposure to get a precise cooling recommendation.
Wall Painting and Dilution Optimizer
Calculate exactly how many litres or gallons of paint you need for your walls. Adjust for coats, surface type, dilution and get the real cost before buying.
Standby Power Consumption Vampire Draw Simulator
Discover how much electricity your devices waste in standby mode. Calculate the hidden annual cost of phantom loads from TVs, routers, chargers and more.
Desk Ergonomics and Workspace Layout Alignment
Enter your height and instantly see how to adjust your chair, desk and monitor to eliminate back and neck pain in your home office.
Home Appliance Water and Energy Cycle Cost Calculator
Calculate the true cost per load of your washing machine, dishwasher and tumble dryer. See exactly how much electricity, water and detergent each cycle costs and discover how much you can save by switching to Eco mode.
Tile Layout and Waste Calculator
Plan your room flooring with precision. Calculate exact tile quantities, boxes needed, total cost, and visualize the layout in real time with an interactive grid preview.
Home Lighting and Lumens Calculator
Calculate exactly how many lumens and light bulbs you need for any room. Select your room type, dimensions, and bulb type to get a professional lighting plan with real-time lux estimates.
Home Humidity and Dehumidifier Run Time Estimator
Calculate how much water your dehumidifier must extract to bring a damp room to a healthy humidity level. See estimated run time, mold risk warnings and comfort zone visuals in one interactive tool.
Home Water Softener and Salt Consumption Optimizer
Analyze your water hardness level, calculate optimal softener settings and estimate annual salt consumption. See limescale impact forecasts, salt refill timelines and appliance lifespan predictions in one interactive tool.
File and Text Tools
9 toolsOnline Character and Word Counter Letter Counting Tool
Online character, word, sentence, and paragraph counter. Calculate reading and speaking times. Free tool perfect for SEO and social media.
Clipboard to PNG: Download Screenshots and Images
Online tool to convert clipboard content (screenshots, images) into an instantly downloadable PNG file. 100% private and fast process.
Free Online Emoji and Double Space Remover
Clean your texts instantly: remove WhatsApp emojis, normalize multiple spaces, and delete invisible characters for a professional and clean finish.
Strip Text Formatting Online Free: Style Cleaner
Remove bold, italics, links, and colors from any text. Convert HTML or Word to plain text (txt) instantly with our professional style cleaner.
Online Hash Verifier: SHA 256, MD5 and SHA 1
Calculate and verify the integrity of your files by comparing their SHA256, MD5, or SHA1 digital signature. Ensure your downloads have not been altered.
JSON to CSV Converter Online Free: Export to Excel
Transform your JSON files into CSV tables quickly and easily. Ideal for data analysts who need to open JSON files in Excel or Google Sheets.
Online Text Splitter: Separate by Paragraphs, Sentences or Length
Split long texts into smaller parts automatically. Choose between separating by number of words, characters, paragraphs, or sentences.
Online Text to Markdown Converter: Format Documents
Transform plain text into Markdown code quickly. Convert paragraphs, headers and lists into format compatible with GitHub, Reddit and MD editors.
File Size Converter & Visualizer: Binary & Decimal
Convert between file size units instantly. See how long downloads take and visualize storage usage across devices. 100% local processing.
Social Media Tools
7 toolsReddit Text Formatter: Cleaner and Markdown Fixer
Advanced text cleaner for posting on Reddit. Fixes missing line breaks, removes multiple spaces and hidden characters that break Markdown.
Social Safe Zones: Video Simulator for TikTok, Reels & Shorts
Preview your images and videos with the real social media interface. Ensure your content is always visible and avoid accidental cropping.
Social Media Image Resizer: Crop & Resize for Every Platform
Resize and crop your photos for Instagram, TikTok, YouTube and more. Smart cropping with updated official dimensions for 2026.
Social Media Account Value Calculator: TikTok & Instagram Pricing
Find out how much to charge for sponsored posts. Our calculator analyses followers, engagement and niche to give you a fair market value.
Tinder Photo Optimizer: Face Analysis and Composition
Optimize your Tinder photos with algorithmic face analysis. Simulates the 2026 interface, analyzes scientific framing and eye-line, exports perfect 9:16 portrait photos to maximize matches.
YouTube Thumbnail Extractor (HD)
Extract and download the original thumbnail image from any YouTube video at maximum resolution and without watermarks using just the URL.
YouTube Thumbnail Previewer Online: Boost Your CTR for Free
Upload your thumbnail and see how it looks in the real YouTube feed on mobile and desktop. Dark and light mode simulator to optimize clicks instantly.
Online Music Tools
7 toolsAudio Storage Calculator: WAV, FLAC and MP3 File Size
Estimate the disk space needed for your audio recordings in WAV, FLAC and MP3 based on sample rate and bit depth.
BPM to Milliseconds Calculator for Delay and Reverb
Convert your project tempo (BPM) into exact delay times (ms) and frequencies (Hz). The essential tool for setting delays, reverbs and compressors with rhythmic precision.
Frequency to Musical Note Converter
Convert hertz to musical notes instantly. Identify the exact note of any frequency, measure the deviation in cents, hear the pure tone and tune synthesisers and samplers with precision.
Online Metronome: High Precision Visual and Audio
Free online metronome for musicians. Millisecond precision with Web Audio API. Visual, audio and Tap Tempo. Perfect for instrument practice.
Music Note Equivalency: Latin, Anglophone and German Systems
Interactive translator of musical notes between Latin (Do, Re, Mi), Anglo-Saxon (C, D, E) and Germanic (H) systems. Includes piano visualizer, octaves and frequencies (Hz).
Phase Distance Calculator for Microphones
Calculate the delay and compensation needed to align microphones. Avoid phase cancellation and comb filtering with sample-accurate precision and temperature adjustment.
Guitar String Tension Calculator
Estimate the tension of every guitar string from its gauge, scale length and tuning. Compare the feel of complete string sets offline in metric or imperial units.
Online Health Tools
41 toolsBinaural Wave Tuner for Lucid Dreams
Induce lucid dreams and deep relaxation states with delta, theta and alpha binaural beats. Frequency generator with visual stroboscope.
Blood Test Unit Converter
Medical calculator to convert blood test results between mg/dL and mmol/L. Compatible with glucose, total cholesterol, HDL, LDL, triglycerides, creatinine and urea.
BMI Calculator: Body Mass Index Online
Calculate your Body Mass Index (BMI) for free. Online tool to assess your nutritional status based on your weight and height, with visual scale and WHO categories.
Amputation Adjusted BMI Calculator
Calculate conventional BMI and amputation-adjusted BMI with Mellor/Garrison segment weight correction, interactive body map, metric and imperial units.
Body Adiposity Index Calculator
Estimate Body Adiposity Index (BAI/IAC) from hip circumference and height. Educational calculator with metric and imperial units, visual interpretation, and clear limitations.
Body Fat Percentage Calculator
Estimate body fat percentage with the U.S. Navy tape method or a BMI-based equation, switch between metric and imperial units, and compare the result with common body fat categories.
Waist to Hip Ratio Calculator
Calculate waist-to-hip ratio (WHR) from waist and hip circumference, compare the result with WHO risk thresholds, and learn how to measure correctly.
Waist to Height Ratio Calculator
Calculate waist-to-height ratio (WHtR), compare your waist with half your height, and interpret cardiometabolic risk bands for adults.
Conscious Breathing Visualizer: Box Breathing and Wim Hof Method
Instantly reduce stress and anxiety with our breathing visualizer. Bio-feedback guide for Box Breathing, 4-7-8 and Wim Hof Method.
Caffeine Metabolism Tracker: Sleep Simulator
Calculate how much caffeine remains in your system based on your metabolism. Decay visualizer to avoid insomnia and improve your rest.
Caloric Deficit Calculator
Estimate a safe daily calorie target from BMR, activity, TDEE, desired deficit percentage, current weight, and goal weight, with clear 1200/1500 kcal safety warnings.
Daily Protein Calculator
Estimate daily protein intake from body weight, age, activity level, goal, and pregnancy or lactation status. Includes food equivalents and a soft safety-limit warning.
Macronutrient Calculator
Split daily calories into carbohydrates, protein, and fat for balanced, keto, low-carb, high-protein, or custom diet planning, with calories and grams shown instantly.
TDEE Calculator
Estimate total daily energy expenditure from Mifflin-St Jeor or Katch-McArdle BMR, activity multipliers, body fat percentage, and metric or imperial body measurements.
BUN/Creatinine Ratio Calculator
Calculate the BUN/creatinine ratio to differentiate prerenal azotemia, intrinsic renal failure, and postrenal obstruction. Supports mg/dL and mmol/L for BUN, mg/dL and µmol/L for creatinine.
Serum Osmolality Calculator
Calculate estimated serum osmolality from sodium, glucose, and BUN or urea, then compare it with measured osmolality to estimate the osmolar gap.
Mean Arterial Pressure Calculator
Calculate mean arterial pressure from systolic and diastolic blood pressure, with an optional heart-rate-corrected MAP estimate and perfusion range color coding.
Corrected Sodium in Hyperglycemia Calculator
Estimate glucose-corrected serum sodium with the Katz 1.6 mEq/L factor or the Hillier modified factor for marked hyperglycemia.
Fractional Excretion of Sodium (FENa) Calculator
Calculate fractional excretion of sodium from serum sodium, urine sodium, serum creatinine, and urine creatinine, with creatinine unit conversion and cautious AKI interpretation bands.
Corrected Reticulocyte Count and RPI Calculator
Calculate corrected reticulocyte percentage and reticulocyte production index (RPI) from observed reticulocytes, patient hematocrit, and reference hematocrit.
Estimated Blood Volume Calculator
Estimate adult blood volume with Nadler, Lemmens-Bernstein-Brodsky, and Gilcher methods using sex, height, weight, body habitus, and metric or imperial units.
Anion Gap Calculator
Educational anion gap calculator with optional potassium and albumin correction, a cation-anion balance graphic, and conservative acid-base interpretation prompts.
Creatinine Clearance Calculator (Cockcroft Gault)
Educational Cockcroft Gault creatinine clearance calculator with weight selection, unit conversion, and renal function bands.
Corrected Calcium Calculator
Educational corrected calcium calculator for adjusting serum calcium levels in patients with hypoalbuminemia using conventional and SI units.
Estimated Glomerular Filtration Rate (eGFR) Calculator
Educational eGFR calculator using the CKD-EPI (2021) and MDRD equations to assess kidney function and classify Chronic Kidney Disease (CKD) stages.
Target Height Estimator
Estimate a child's adult genetic target height from biological parental heights with the Tanner mid-parental height method and a +/-8.5 cm clinical range.
Color Blindness Simulator: Visualize Color Vision Deficiency
Simulate how people with color blindness perceive color. Visualize protanopia, deuteranopia, tritanopia and more with your own image or the included sample palette.
Digestion Stopwatch: Physiological Transit Tracker
Calculate how long your food takes to digest. Track progress through the stomach, small intestine, and large intestine based on macronutrients.
Epworth Sleepiness Scale Test
Measure your daytime sleepiness with the Epworth Sleepiness Scale. A clinically validated test to detect possible sleep disorders.
Climate and Weight Hydration Calculator
Calculate exactly how much water you need to drink today. Algorithm adjusted for ambient temperature, relative humidity and physical activity level.
Lean Body Mass Calculator
Estimate lean body mass from height, weight, sex, and the Boer, James, or Hume equations. Includes metric and imperial units, a live donut chart, and body-composition visualization.
Estimated Metabolic Age Calculator
Estimate metabolic age from chronological age, sex, height, weight, optional body fat percentage, and activity level using BMR-based metabolic comparison.
Pelli Robson Contrast Sensitivity Test
Measure your visual contrast sensitivity with the Pelli Robson test. Diagnose your ability to detect shades of grey, essential for night driving and eye health.
Peripheral Vision Trainer
Train your peripheral visual field with this agility game. Improve reading speed, situational awareness, and ocular reaction time.
Optimal Reading Distance Calculator
Find out how many centimetres from the screen you should sit based on your font size. Avoid eye strain and protect your vision with ergonomics.
Ocular Decompression Rest Calculator
Calculate how many minutes of visual rest you need based on your daily screen time. Personalised 20-20-20 rule to prevent digital eye strain and fatigue.
Tinnitus Relief: Online Notch Therapy Tool
Free online tool for tinnitus relief through Notch Therapy. Customizable white, pink and brown noise generator with a notch filter at your exact tinnitus frequency.
Parametric Pink and Brown Noise Synthesizer
Browser based pink, brown, white and blue noise generator with real time spectrum visualization, low pass cutoff, resonance control and a sleep fade out timer.
Standard Drink Unit Calculator
Calculate the pure grams of alcohol and Standard Drink Units (SDU) of your cocktails, beer, wine and shots for safe and informed consumption.
Emergency Water Purifier
Bleach dosage calculator to purify emergency water. Survival tool based on WHO and CDC guidelines.
Sleep Debt Recovery Planner
Estimate recent sleep debt and shape a gentle recovery plan without turning a sleep pattern into a diagnosis.
Sports & Performance Tools and Calculators
23 toolsBasketball Scoreboard Online: Free Score Keeper
Free online basketball scoreboard with +1, +2 and +3 buttons. Keep score for pickup games, streetball, high school and local league matches. No signup, no download, works offline.
Football Scorekeeper Online: Free Soccer Match Tracker
Track football match scores online for free. Simple goal counter for soccer games, friendly matches, and tournaments. No registration needed.
Gym Workout Tracker: Progress Charts and Strength Log
Log your lifts, select exercises, and visualize your progress with strength charts. Optimize your progressive overload in the gym.
Ping Pong Scorekeeper Online: Free Table Tennis Tracker
Track table tennis matches with game and set scoring. Free online ping pong scorekeeper for friendly games and tournaments. No registration needed.
Reaction Speed Test (Reflexes): Online Benchmark
Measure your reflexes in milliseconds with our professional reaction test. Compete for ranks from 'Turtle' to 'Cyberathlete' and analyze your performance.
ELO Rating Calculator for Chess, Esports and Sports
Free ELO rating calculator for wins, draws and losses. Enter both ratings, choose a K factor, and see the exact rating change, expected score, new ELO and opponent ELO.
Sports Scoreboard Online: Free Score Counter
Digital scoreboard with giant buttons for mobile. Ideal for padel, ping-pong and football. No annoying ads in the middle of the game. Simple and fast.
Free Online Bracket Generator and Tournament Organizer
Organize tournaments and create single-elimination brackets for free with no registration. Perfect for FIFA, Padel, eSports and board games. 100% Mobile Friendly.
Tennis Scorekeeper Online Free Match Tracker
Track tennis matches with set and game scoring. Free online tennis scorekeeper for matches and tournaments. No registration needed.
Darts Scorekeeper Online Leg and Set Tracker
Track darts matches with leg and set scoring. Free online darts scorekeeper for 501 and 301 matches featuring live checkout calculations and stats.
Padel Scorekeeper: Gold Point & Rotation Tracker
Track padel scores with the official Punto de Oro (Gold Point) rule, serve rotation alerts, set tiebreaks, and dynamic ends swapping animation.
Streetball 3x3 Scorekeeper with Shot Clock
Track FIBA 3x3 Streetball scores with an integrated 12-second shot clock, team fouls, sudden death points, and dynamic half-court visual indicators.
Beach Volleyball Scorekeeper & Rotation Tracker
Track beach volleyball scores, serving rotation order, wind side-swaps, and sets with an interactive top-down golden sand court visualization.
Snooker Frame Tracker and Break Calculator
Track live snooker frame scores, calculate current break values, display remaining points on the table, and get real-time deficit status like need snookers.
Rugby Scorekeeper with Sin Bin Timers and Match Clock
Track live rugby match scores with try, conversion, penalty and drop goal logging. Manage sin bin countdown timers and match halves with an interactive stadium scoreboard.
Baseball and Softball Scorekeeper with Diamond Tracker
Track live baseball scores with runs, hits and errors. Visual diamond with base runner positions, ball strike count tracker, and inning by inning history grid.
Penalty Shootout Tracker: Online Football Scoreboard
Real-time football penalty shootout scorekeeper. Features 5-round tracking, mathematical elimination detection, sudden death rules, and instant winner announcements.
Running Pace Calculator and Race Time Predictor
Calculate running pace, estimate finish times for 5K, 10K, Half Marathon, and Marathon using Riegel formula, and generate target training zones.
Critical Swim Speed CSS Calculator
Calculate your Critical Swim Speed threshold pace per 100m or 100yd from 400m and 200m swim tests. Generate target splits for pool sets.
Volleyball Scoreboard: Live Scoring, Rotations and FIVB Match Tracker
Professional indoor volleyball scoreboard and tactical rotation tracker. Track live points, sets, clockwise player rotations, timeouts, substitutions, and side-outs with interactive court visualization.
VO2 Max Calculator for Running Walking and Beep Tests
Estimate VO2 max from a 12 minute run, 1.5 mile run, Rockport one mile walk, or 20 meter beep test and compare the estimate with age and sex references.
Round Robin League Manager for Groups
Create a round robin schedule for your group, record every result and follow the league table. Manage several leagues and share a complete snapshot by link without registration.
Calories Burned Calculator by Exercise and MET
Estimate gross and net calories burned from exercise using activity, intensity, body weight, duration, and MET values from the 2024 Adult Compendium.
Motor Vehicle Tools and Calculators
6 toolsBraking Distance Calculator for Cars and Motorcycles
Estimate reaction, braking, and total stopping distance from speed, reaction time, road grip, and gradient for cars and motorcycles.
Real Fuel Consumption Calculator for Cars and Motorcycles
Calculate real gasoline, diesel, or electric consumption from distance and fuel added. Compare cost per 100 km and check the result against the official figure.
Car and Motorcycle Gear Ratio RPM Speed Calculator
Calculate vehicle speed by gear from engine RPM, primary drive, final drive, gear ratios, and wheel diameter for cars and motorcycles.
Tire Pressure Converter
Convert PSI, bar, kPa and kgf/cm² for car and motorcycle tire readings, with clear axle notes and no invented pressure recommendations.
Motorcycle Skid Mark Speed Estimator
Estimate a motorcycle speed range from skid mark length, surface friction, grade, and which brake left the mark. Educational only, not an accident reconstruction.
EV Charging Time and Cost Planner
Estimate electric vehicle charging time, electricity cost, charging losses, and recovered range from your battery and charger settings.
Nature & Agriculture Tools
6 toolsCricket Thermometer: Dolbear's Law Temperature Calculator
No thermometer? Listen to the crickets. Calculate the exact temperature by counting chirps with our Dolbear's Law calculator.
Digital Carbon Footprint Calculator
Analyze the environmental impact of any web page. Estimate energy consumption and CO₂ emissions per visit.
Rainwater Harvesting Calculator
Calculate how much rainwater you can collect from your roof and size your storage tank.
Seed Spacing and Planter Calibration Calculator
Precision tool for farmers. Calculate the ideal spacing between seeds based on target population and row width, and analyse planter stress at different working speeds.
Urban Garden Rainwater and Soil Planner
Calculate raised bed soil volume and estimate rainwater collection for a balcony, container garden, or urban growing space.
Compost Bin Volume and Browns Greens Ratio Calculator
Calculate the internal volume of a rectangular or cylindrical compost bin and check the practical balance of browns, greens, moisture, and air.
Web Development
29 toolsAspect Ratio Calculator in Pixels. Online Proportions
Calculate new image, video and web design resolutions and maintain the exact proportion to avoid distorting graphics. Supports 16:9, 4:3, 21:9 and custom formats.
Data Time Calculator Impact of Web Speed
Discover how much lifetime your users lose waiting for your website to load on 3G, 4G, and 5G connections. Calculate the real impact of your site weight.
Online Color Converter RGB HEX and HSL
Convert colors between RGB, HEX and HSL instantly. Generate complementary color harmonies and analyze WCAG contrast. 100% client-side and private.
Excel and CSV to HTML Table Converter Code Generator
Convert your Excel or CSV data to clean, semantic HTML tables instantly. Free tool for developers and content creators.
Online Cron Expression Generator. Translator and Visualizer
Free visual tool to generate Linux Cron expressions. Translates * * * * * into human language and shows the next 5 executions in real time.
CSS Specificity Calculator Online. Selector Weight Visualizer
Calculate the specificity and exact weight of any CSS selector. Visual tool to understand which CSS rule wins the cascade and avoid using !important.
CSS to Inline HTML Converter. Inliner for Emails
Transform your stylesheets and CSS classes into automatically inlined styles in your HTML. Ideal for newsletters, transactional emails, and safe web layout.
Duplicate CSS Remover Online. Unify and Clean Stylesheets
Free tool to clean and purge duplicate CSS code. Unifies redundant selectors, respects the cascade, and reduces your file size instantly in the browser.
Security.txt Generator RFC 9116
Create your professional security.txt file to facilitate vulnerability reporting and comply with international web security standards.
Online Security Hash Generator
Calculate MD5, SHA-1, SHA-256 and SHA-512 hashes instantly. Free, private and ultra-fast security tool for developers. 100% Client-Side.
Online SSL/TLS Certificate Inspector View PEM and CRT Files
Analyze SSL certificate files (.pem, .crt, .der) locally. Check expiration dates, issuers, subjects and SHA-256 fingerprints without your data leaving your browser.
Free Online JSON Formatter and Validator
Free online tool to format, validate and repair JSON code. Beautify and format JSON. Detects syntax errors and improves code readability.
Online Keyboard Key Code Visualizer. KeyCode Inspector
Free online tool to see the event.key, event.code, event.which and location of any keyboard key in real time. Generates ready-to-use JavaScript code snippets.
LLM Cost Calculator. AI Model Pricing Estimator
Free online tool to estimate the cost of calling LLM APIs. Compare GPT-4o, Claude, Gemini, Llama and more with real token prices per million tokens.
Mobile Mockup Generator for App Store. iPhone and Google Pixel
Create professional presentations for the App Store and Google Play. iPhone and Pixel mockups with custom backgrounds, panoramic layouts, and bulk high-resolution export.
Musical Typography Scale. Modular Scale Calculator
Free online tool to create harmonious visual hierarchies using modular scales based on musical proportions. Generates ready-to-use CSS variables for your web design.
Placeholder Image Generator. Rapid Web Mockups Online
Create custom placeholder images for your web designs. Adjust resolution, background, text and export in PNG, WebP or JPEG instantly.
Private AI Prompt Library
Organize, tag and save your ChatGPT, Midjourney and Claude prompts privately. Your own prompt bank in localStorage.
Visual Readability Calculator WCAG and APCA
Check the real contrast of your designs with APCA (WCAG 3.0). Analyze how font weight and size affect actual readability. From simple ratios to perceptual legibility.
Online SVG Sanitizer
Optimize and clean SVGs exported from Figma, Adobe Illustrator or Inkscape. Remove metadata, unnecessary attributes and empty groups to get a production-ready SVG.
Free Online SVG to CSS and Data URI Converter
Transform your SVG icons and vectors into CSS code (Background or Mask) or compressed Data URI. Optimise your website performance by eliminating external HTTP requests.
URL Tracking Cleaner: Remove UTM, FBCLID and GCLID
Automatically remove tracking and advertising parameters from your URLs. Share clean links and protect your digital privacy instantly.
URL Encoder and Decoder Online
Convert special characters from any link to safe format (Percent-Encoding) or return them to their original readable state instantly and locally.
UTM Parameter Generator for Google Analytics
Create precise tracking links for your digital marketing campaigns. Optimized for Google Analytics and other analytics tools.
SERP Simulator and SEO Pixel Counter
Preview Google-style search snippets in real time, measure title and meta description width by pixels, and see exactly where your copy will be trimmed.
JWT Decoder, Parser and Claims Inspector
Paste a JSON Web Token, decode its header and payload instantly, inspect registered claims, spot expired tokens, and copy clean JSON for debugging authentication flows.
Visual CSS Grid & Flexbox Layout Generator
Design responsive layouts by dragging visual blocks, resizing the container, tuning alignment controls and using presets - then copy clean native CSS instantly.
CSS Box Shadow Generator
Design layered CSS box shadows visually with live preview, sliders, color pickers and presets. Copy clean native CSS instantly.
Promote this website
The internal propaganda desk for jjlmoya.es in Spanish and GameBob.dev internationally. Turn screenshots from your own pages into social images before Bob decides the feed is embarrassing.
Hardware Testing & Diagnostic Tools
38 toolsLithium Battery Health Calculator
Calculate the State of Health (SoH) of your lithium battery based on cycles, voltage and temperature. Scientific guide to maximize energy longevity.
Dead Pixel Test and Screen Repair Tool
Check if your monitor has dead or stuck pixels and repair them with our high-frequency strobe tool online.
Touch Screen Tester
Draw on a full-screen canvas to test touchscreen dead zones, missed taps, edge response, palm interference, and how many simultaneous multi-touch points your phone or tablet can detect.
Online Gamepad & Controller Test
Test your Xbox, PlayStation or PC controller. Visualize dead zones, joystick drift and buttons.
Gamepad Polling Test
Measure the browser observed update rate, report interval and timing stability of a USB or Bluetooth gamepad.
Online Gamepad Vibration Tester
Test the haptic motors and Dual-Rumble vibration of your gamepad in the browser. Supports Xbox, DualShock, DualSense and generic controllers.
Online Keyboard Test & Ghosting Detector
Check if your keyboard suffers from Ghosting or Key Jamming. Real-time key visualizer and N-Key Rollover counter.
Keyboard Chatter Test
Detect mechanical keyboard chattering, double typing, and faulty switch bounce by checking how quickly the same key appears twice.
WebMIDI Keyboard Tester
Test a USB MIDI keyboard, synth, pad controller, pitch wheel, modulation wheel, note velocity, and stuck notes directly in the browser with Web MIDI.
Online Mouse Polling Rate Test
Check the real Hz of your mouse. Verify if your gaming mouse works at 1000Hz or more with our professional tool.
Mouse Double Click Test
Test every mouse button and detect unwanted double-clicks, worn switches, and contact bounce with per-button timing in your browser.
Mouse Scroll Test
Diagnose mouse wheel skips, reverse jumps, inconsistent scroll direction, and weak encoder signals with a local browser-based scroll wheel test.
Mouse DPI Analyzer
Measure your real mouse DPI online by moving the mouse a known physical distance and comparing the captured pointer movement in pixels.
Mouse Jitter and Angle Snapping Test
Draw raw mouse traces online to spot sensor jitter, shaky tracking, and angle snapping or prediction that makes movement artificially straight.
Online Tone and Frequency Generator
Generate sine, square, triangle and sawtooth waves. Test your speakers, headphones or subwoofer with frequencies from 20Hz to 20kHz.
Water Ejector Speaker Cleaner
Play a low-frequency 165 Hz tone to help push water, dust or loose debris out of phone, tablet and laptop speakers.
Subwoofer Crossover Test
Run a 200 Hz to 10 Hz sine sweep in your browser to find where your subwoofer fades, drops out, or hands off to your main speakers.
Speaker Phase Tester
Play in-phase and 180 degree inverted stereo test signals in your browser to check speaker polarity, wiring mistakes, and phase cancellation.
Microphone Test And Spectrum Analyzer
Test microphone input, live level, clipping, room noise, and frequency response locally in your browser with a private real time spectrum.
Private Webcam Test
Check camera permission, live video, resolution, aspect ratio, orientation and observed frame delivery before a meeting or stream.
Monitor Refresh Rate Detector
Instantly detect your monitor's refresh rate with precision using requestAnimationFrame. Test frame stability and compare with industry standards.
Monitor Ghosting Test
Test monitor ghosting, motion blur, overdrive trails, and pixel response behavior with moving bars, text, and fullscreen motion patterns.
Backlight Bleed and Blooming Test
Run a pure black fullscreen backlight bleed test and a draggable white local dimming blooming test for OLED, Mini LED, IPS, VA, monitors, laptops, and TVs.
OLED Screen Burn In Fixer
Run a fullscreen OLED burn-in fixer and LCD stuck pixel exerciser with rapid RGB color cycles, white noise, a required photosensitivity warning, and a native timer.
Color Accuracy Test: Spectrum Canvas
Calibrate your display with precision. Test sRGB and DCI-P3 color spaces, detect color shifts, measure accuracy with Delta E metrics, and generate professional calibration reports.
UPS Runtime Calculator
Estimate UPS battery runtime, total protected load, usable watt-hours, and recommended VA size for PCs, monitors, routers, NAS devices, and home lab hardware.
USB Power Budget Calculator
Check whether a USB port, charger, hub, cable, or USB-C PD profile can safely power your devices after headroom and cable voltage drop.
Mobile Sensor Test
Run an online gyroscope, accelerometer, motion sensor, and bubble level test on your phone to check tilt, rotation, drift, and sensor calibration problems.
Stereo Audio Test
Check left and right speaker channels, stereo balance, wiring direction, and headphone imaging with browser-generated test tones.
Web Bluetooth BLE Scanner
Scan nearby Bluetooth Low Energy devices from the browser, inspect exposed GATT service UUIDs, and test whether your IoT or wearable hardware is discoverable.
WebUSB Serial Monitor
Connect to USB serial hardware from the browser, read live terminal output, send commands, and debug Arduino, ESP32, RP2040, and maker boards without installing a desktop terminal.
Input Lag & System Latency Test
Online hardware input lag and system latency measurement tool using high-precision performance timing and frame buffer synchronization.
PSU Power Requirement Calculator
Estimate PC power supply requirements from component wattage, transient margin, growth headroom, and the power supply already installed.
Resistor Color Code Calculator
Decode resistor bands into resistance, tolerance, range, and temperature coefficient, or work backwards from a target value.
LED Resistor Calculator
Find the series resistor for an LED from supply voltage, forward voltage, and current, then pick the nearest E12 or E24 value and a safe wattage.
Audio Delay Test
Test perceived audio delay on speakers, headphones, Bluetooth devices, and video playback with a local browser pulse test.
Voltage Divider Calculator
Calculate a resistor divider output voltage, current, power dissipation, or the lower resistor needed for a target voltage.
Ohm Law and Electrical Power Calculator
An Ohm law calculator for finding voltage, current, resistance, and electrical power from any two values you know.
Tools and Calculators for Specialty Coffee Lovers
8 toolsCoffee Brew Ratio Calculator
Calculate the exact grams of coffee or milliliters of water for your ideal ratio (1:15, 1:16...). Includes in-cup result, pour guide, iced coffee mode and saved recipes.
Coffee Brew Timer
Professional specialty coffee timer with pour phases, rhythm audio alerts and extraction summary. Optimized for V60, Chemex and Aeropress.
Coffee Grind Size Converter
Interactive grind size chart with clicks and levels guide for adjusting your grinder between Espresso, V60, French Press and more. Technical micron mapping for all extraction methods.
SCA Coffee Water Calculator
Calculate custom mineral recipes for specialty coffee according to SCA guidelines for TDS, hardness, alkalinity, and pH.
Coffee Extraction Diagnostics: The Brew Fixer
Diagnose why your coffee tastes bad in seconds. Get personalized adjustments for grind size, temperature, and time based on your brewing method and taste profile.
AeroPress Recipe and Brew Ratio Calculator
Calculate water distribution, chamber capacity limits, dilution bypass, and extraction steps for AeroPress coffee brewing.
Cold Brew Coffee Ratio Calculator
Use this cold brew coffee ratio calculator to measure coffee, brew water, concentrate dilution, steep time, and served yield in metric or imperial units.
Espresso Extraction Calculator
Log dose, beverage mass, and shot time to read brew ratio, flow rate, and optional extraction yield from a refractometer TDS reading.
3D Printing Tools and Calculators
41 tools3D Printing Cost Calculator: Filament and Energy
Calculate the real price of your 3D prints. Includes material cost, electricity, machine amortization, and labor.
Volumetric Flow: Understanding the Real Speed Limits of Your 3D Printer
Calculate the maximum volumetric flow rate of your 3D printer. Understand the real hardware limitations of your hotend.
UV Resin Curing Time Calculator
Determine the exact curing time for your resin 3D prints. Based on lamp power in watts, resin type, and distance. Professional technical guide.
3D Shrinkage Calculator: Scale Factor and Shrinkage
Calculate how much you should scale your 3D designs based on the material (ABS, Nylon, ASA) to compensate for thermal shrinkage and get exact measurements.
3D Printer Power Supply Size Calculator for Hotends, Heated Beds, Motors, and 12V vs 24V Upgrades
Estimate PSU wattage and maximum current for a 3D printer upgrade by adding heated bed, hotend cartridge, stepper motor, auxiliary load, and safety headroom.
CoreXY Belt Tension Frequency Calculator and GT2 Belt Wear Estimator
Calculate CoreXY belt tension from measured vibration frequency or belt deflection, compare it with practical GT2 ranges, and estimate whether the belt is running slack, balanced, or over-tensioned.
Rainbow Filament Transition Length Calculator for 3D Prints
Estimate rainbow filament color cycles, spool usage, and where gradient transitions will appear along the Z height of a sliced 3D print.
ABS Acetone and PVB IPA Vapor Smoothing Time Calculator
Estimate conservative vapor exposure and drying time for ABS acetone smoothing or PVB isopropyl alcohol smoothing from chamber volume, temperature, part volume, and surface detail.
Print Bed Thermal Inertia Stabilization Calculator
Estimate how long to let a heated 3D printer bed rest after reaching setpoint, using plate material, thickness, target temperature, heater power, and bed size.
Tree Support Density Calculator
Estimate tree support canopy diameter, support volume, branch count, contact diameter, and stability from support height, branch angle, branch density, and base trunk diameter.
Stepper Motor Steps per MM & Microstepping Calculator
Calculate the exact steps per mm (or steps/inch) and theoretical mechanical resolution for 3D printer stepper motors. Supports TMC2209, TMC2208, belts, and lead screws.
PEI Sheet Lifespan Estimator for Magnetic 3D Printer Build Plates
Estimate remaining PEI build plate life, adhesion failure risk, and likely wear mode from PEI texture, print count, bed temperature, material, spatula use, and cleaning method.
3D Print Weight Infill Percentage Calculator
Estimate part weight, filament saved, and material cost when changing infill percentage and pattern from a 100% infill reference weight.
3D Printer Nozzle Wear Estimator for Abrasive Filament Lifespan
Estimate remaining nozzle life from nozzle material, abrasive filament type, nozzle diameter, extruded mass, abrasive share, and print temperature.
3D Print XYZ Axis Tensile Strength Estimator
Estimate theoretical tensile strength, maximum static load, elastic modulus, anisotropy penalty, and critical delamination axis for structural FDM parts.
3D Print Time Workflow Optimizer
Compare two FDM print setups side by side with layer count, corrected overhead, filament consumption, cost, quality tradeoff, and hardware speed warnings.
3D Print Time Estimator by Layer Height and Speed
Estimate 3D print duration without opening a slicer by combining model height, layer height, print speed, infill, complexity, travel overhead, and filament usage.
Real Resin Cost Calculator for SLA and DLP Prints
Calculate theoretical and real resin cost with density conversion, slicer volume, and a 10 to 15 percent waste correction for complex SLA and DLP parts.
SLA Resin Hollowing and Drainage Calculator
Calculate conservative wall thickness, drain hole diameter, minimum vent count, and complexity-adjusted resin savings for hollow SLA and DLP resin prints.
3D Printer Retraction and Stringing Calibration Assistant
Calculate a safe retraction distance and speed test range from extruder type, Bowden tube length, filament material, nozzle size, temperature, and stringing severity.
Safe 3D Print Overhang Angle Calculator
Estimate the maximum unsupported overhang angle your FDM printer can handle from layer height, line width, cooling, material, and print speed.
3D Printer Bed Mesh Analyzer
Parse Marlin or Klipper bed mesh data, visualize the surface, diagnose tilt or warp, and convert Z error into screw turn instructions.
3D Print Bridging Optimizer
Calculate practical bridge speed, bridge fan speed, and bridge flow ratio for FDM prints from span length, material, temperature, line width, and baseline speed.
Bulk Filament ROI Estimator
Compare 1kg filament spools against 3kg, 5kg, or custom bulk spools with humidity risk, real savings, and local currency formatting.
Wall and Perimeter Optimizer
Calculate the exact number of perimeters and a safe line width so printed wall thickness matches the CAD model without internal gaps.
Warping Risk Simulator for 3D Printing
Estimate first-layer lift and warping risk from material shrinkage, footprint area, longest diagonal, bed temperature, room temperature, and enclosure conditions.
3D Printer Acceleration, Jerk, and Square Corner Velocity Ringing Calculator
Estimate safe X/Y acceleration and jerk or Klipper square corner velocity from toolhead mass, bed mass, target speed, printer kinematics, and frame rigidity.
E steps Calibration Calculator and Extruder Diagnostic Assistant
Calculate corrected extruder E-steps from a measured extrusion test and flag deviations above 5% before they hide a mechanical problem.
Technical Resin UV Curing Time Calculator
Estimate safe SLA resin post-curing time from resin type, maximum wall thickness, wash and cure station power, and UV wavelength.
Additive Production Efficiency Calculator
Compare batch printing vs sequential printing with print time, preheat overhead, travel transitions, purge time, statistical failure risk, and an automatic viability recommendation.
Volumetric Flow Rate Calculator: Precision Hotend Limits
Calculate 3D printing volumetric flow in mm3/s, compare it with hotend melt rate capacity, and identify when speed, line width, and layer height will cause under-extrusion.
Machine Hourly Rate & Production Cost Calculator
Calculate the real operating cost of a 3D printer from power consumption, electricity tariff, machine purchase price, useful life, and print duration.
Elephant Foot Compensation Calculator: Precision Dimensional Correction
Calculate negative horizontal expansion and CAD chamfer depth for 3D print first layer elephant foot using measured dimensional error, layer height, Z-offset pressure, and bed temperature.
Filament Weight to Length Converter: Accurate Material Estimation
Convert filament grams to meters and volume with material density, 1.75mm or 2.85mm diameter, and an instant spool sufficiency check.
Multi Material Purge Calculator: Analyze & Optimize Filament Waste
Estimate AMS and MMU purge tower volume, wasted filament mass, and transition cost with a pigment-intensity matrix for color changes.
Filament Dehydration Estimator: Thermal Regeneration Guide
Model hygroscopic filament saturation with exponential adsorption kinetics, humidity exposure, polymer type, and drying chamber temperature.
Precision Engineering Suite for FDM 3D Printing
A reactive diagnostic suite for FDM quoting, margins, labor, ROI, ISO-style CAD tolerances, filament drying, and AMS/MMU purge waste.
Metric Thread Tolerance Calculator: CAD Design Guide for 3D Printing
Calculate CAD offsets for functional ISO metric threads in 3D printing using a nonlinear pitch, diameter, process, and material compensation model.
3D Print Farm ROI Calculator
Simulate monthly profitability, payback period, and annualized ROI for a 3D printing farm using utilization, failure rate, electricity, overhead, and variable hourly costs.
3D Print Post Processing Cost Calculator
Estimate manual finishing, support removal, sanding, painting, other labor, consumables, and currency-adjusted post-processing cost for 3D printed parts.
3D Print Pricing Calculator: Margin, Markup and Market Position
Calculate 3D print retail price from manufacturing cost, target profit margin, markup, and competitor pricing with strict margin-vs-markup math.
Streaming and Content Creator Tools
4 toolsRandom Name Picker for Streaming
Choose a winner at random from a list of names. Free, fast, and visual giveaway tool for Twitch, YouTube, and events.
ISP Blockage Detector Tebas Check
Diagnostic tool to detect illegitimate blocking of shared Cloudflare IPs by Spanish ISPs.
Video Bitrate and Storage Planner
Estimate video storage, frame timing, and practical bitrate tiers for streaming or recording scenarios.
Stream Scene Countdown Clock
Build a streamer-first countdown slate for starting soon, BRB, raid, and intermission scenes.
Precision Financial Tools & Calculators
18 toolsCompound Interest Calculator: Visualize Your Future Wealth
Discover how small investments become large fortunes. The definitive tool for planning your financial freedom and retirement.
Financial Freedom & Survival Runway Calculator
Calculate exactly how long your savings will last. Our survival runway tool helps you visualize your financial independence and plan your exit strategy or emergency fund.
Investment Profitability Calculator: ROI & CAGR
Analyze your investment performance with precision. Calculate total Return on Investment (ROI) and Compound Annual Growth Rate (CAGR) to understand your true annualized gains.
Spanish Court Fees Calculator
Calculate exact judicial fees for Spanish companies under Law 10/2012. Automatic Form 696 calculator with exemptions and calculations.
Debt Snowball Calculator: Debt Payment Plan 2026
Calculate your financial freedom date using the debt snowball method by Dave Ramsey. Organize your debts from smallest to largest and visualize your monthly payment plan for free.
FIRE Calculator: 4% Rule
Calculate your financial independence number using the 4% rule. Plan your early retirement and visualize your path to financial freedom.
IBAN to BIC SWIFT Converter and Bank Code Finder
Get the BIC/SWIFT code from any Spanish IBAN instantly. Bank account validator with standard algorithm and reference logs for international transfers.
Inflation Calculator Spain: Historical Money Value
Discover what your pesetas are worth today or how much cost of living has increased since 1980. Updated Spanish CPI historical data through 2026.
Late Interest Calculator: Calculate Penalty Interest
Calculate late payment interest and penalty charges. Tools for simple, compound, and monthly interest calculations. Perfect for overdue invoices and debt calculations.
Spain Legal Interest Rate 2026
Calculate the legal interest rate applicable in Spain for 2026. Automatic calculator with 3.25% rate according to the budget law. Includes delay interest and mora calculations.
Spain Lottery Optimizer and Probability Calculator
Analyze your odds in Spain's Christmas Lottery, Euromillones, and Bonoloto. Calculate the optimal number of tickets and expected value of your bet.
Mortgage Calculator: Full Amortization Table and Payoff Strategy
Calculate your monthly mortgage payment, discover total interest costs, and visualize your complete French amortization schedule instantly.
Percentage Calculator: 4 in 1 for Discounts, Tax and Markups
Calculate percentages online for free. 4 tools in 1 to find X% of Y, percentage difference, add or subtract VAT, discounts and tip calculations automatically.
Spain Rent Increase Calculator IPC 2026 with 3% Legal Cap
Calculate your rent increase based on IPC or the legal 3% limit from Spain's Housing Law. Free tool for Spanish tenants and landlords.
Revolving Card and Usury Simulator: Calculate Payoff and Legality
Simulate how revolving credit cards compound interest, calculate payoff timelines, and compare interest rates against usury thresholds in Spain, UK, US, and custom markets.
Pesetas to Euros Calculator: Old Peseta Value in 2026
Convert Spanish pesetas to euros at 166.386 pesetas per euro, then estimate their purchasing power from 1980 to 2026 with Spain's CPI.
Spain Gross Net Salary and Employer Cost Calculator for 2026
Estimate take home pay, personal income tax withholding, employee contributions and the full employer cost of a salary in Spain under 2026 rules.
Dividend Yield Calculator for Stocks
Calculate gross and after withholding dividend yield, annual income and a declared growth scenario from your own stock figures.
Statistics and Probability Tools
7 toolsAB Test Hypothesis Testing Calculator Online
Compare two groups (A and B) to determine whether there is a statistically significant difference in their conversions or means. Calculate the P-Value instantly.
Chi Square Independence Test Calculator Online
Determine whether a statistical relationship exists between two categorical variables. Fill in the observed frequency matrix and calculate the P-Value instantly.
Confidence Interval Calculator Online
Calculate confidence intervals for the population mean using Z or Student t distributions. Enter the sample mean, standard deviation, sample size, and confidence level to get the interval, margin of error, and critical value instantly.
Descriptive Statistics Calculator Online
Calculate all key descriptive statistics instantly: mean, median, mode, standard deviation, variance, quartiles, skewness, kurtosis and more. Paste your data and get results in real time.
Normal Distribution Calculator Online
Calculate normal distribution probabilities instantly: P(X ≤ a), P(X ≥ a), P(a ≤ X ≤ b) and inverse normal. Enter mean and standard deviation and visualize the Gaussian bell curve with the shaded area.
Pearson Correlation Calculator Online
Calculate Pearson's r coefficient, the coefficient of determination r², and the linear regression line from data pairs. 100% private and local tool.
Sample Size Calculator Online
Calculate the exact number of people needed for your study. Includes options for finite or infinite population, adjustable confidence levels and margin of error.
Tools and Calculators for DIY and Construction Projects
18 toolsBaluster Calculator: Exact Railing Spacing
Calculate the exact spacing between balusters or pickets for railings, complying with the 4-inch (10 cm) safety rule. Automatic layout plans.
Clay Shrinkage Calculator: Exact Dimensions for Ceramics
Calculate clay shrinkage during drying and firing. Design ceramic pieces with the exact final dimensions you need.
Concrete and Mortar Calculator: Bags of Cement per Cubic Metre
Calculate exactly how many 25kg cement bags, sand shovels and litres of water you need per m³. Mix ratios for H200 concrete, M40 masonry mortar and M80 floor screeds.
1D and 2D Cut Optimizer: Minimize Material Waste for Wood and Metal
Free cut optimizer for wood, metal, and pipes. Calculate the most efficient cutting plan using the Best Fit Decreasing algorithm. Supports 1D linear and 2D panel optimization with kerf compensation.
Drill and Machining RPM Calculator
Calculate the ideal revolutions per minute for your drill or milling machine based on material and bit diameter. Prevent tool burnout and achieve better results.
Drill Sharpening Master: Precision Gauge
Interactive guide to sharpen HSS drill bits. Digital gauge on screen to verify 118° and 135° angles. Calculate RPM and diagnose cutting errors.
Drywall and Plasterboard Calculator: Studs, Tracks and Boards
Professional bill of materials calculator for drywall partitions and wall linings. Accurately estimate plasterboard sheets, C-studs, U-tracks, screws, joint tape, and filler compound.
Epoxy Resin Calculator: Exact Mix and Volume
Calculate the exact amount of epoxy resin and hardener for your projects. Avoid waste on river tables, jewelry and molds.
Furniture Fit Calculator: Will It Go Through the Door?
Check if your sofa, wardrobe or dining table fits through the elevator or door. Use the 3D Pythagorean theorem to calculate tilt clearance and avoid expensive moving disasters.
Lime Mortar Mix Ratios: Proportions for Heritage Render and Plaster
Calculate exact lime mortar mix ratios for traditional render, scratch coat and finish coat. Based on Vitruvian proportions used in heritage restoration.
Passepartout Calculator: Mat Board Margins with Optical Center Correction
Calculate exact mat board margins for professional picture framing with bottom weighting optical correction. Gallery-quality proportions for photos and artwork.
Stair Calculator: Design and Execution
Calculate exact stair measurements: tread, riser, slope and materials. Apply Blondel's law and avoid construction errors.
Thermal Expansion Calculator for Beams and Structural Materials
Calculate how much a beam or structure expands with temperature changes. Technical tool for engineers and DIY. Includes expansion coefficients by material.
Voltage Drop Calculator: Wire Cross Section from Volts, Watts and Distance
Free voltage drop calculator for 12V, 24V and 230V systems. Find the right cable cross section by entering current, wire length and conductor material. Essential for camper vans, solar and home wiring.
Workshop Fraction to Metric Converter
Convert fractional inch measurements to millimeters instantly. Find the closest standard fasteners, bolts, and sockets for your workshop. Designed for dirty hands and gloved fingers.
Pythagorean Right Angle Calculator: 3 4 5 Rule for Perfect Squares
Verify if structures are perfectly squared at 90° using the Pythagorean theorem and 3-4-5 rule. Essential tool for construction, carpentry, and DIY projects.
Two Stroke Fuel Mixture Calculator: Accurate Oil and Fuel Ratios
Calculate precise 2-stroke fuel mixture ratios instantly. Essential tool for chainsaws, mopeds, motorcycles, and small engines. Supports 1:25, 1:33, 1:40, and 1:50 ratios.
Excavation Volume Calculator and Soil Swell Estimate
Calculate bank excavation volume and estimate loose soil after digging with a visible planning range for sand, topsoil, clay, and gravel.
Freelancer Work Management Tools
10 toolsFreelancer Quota Calculator 2026: Spain RETA Real System
Free simulator for self-employed contributions in Spain 2026. Calculate your real net income, contribution brackets and monthly quota with the new 0.9% MEI.
Early Retirement Simulator Spain: Calculate Your Pension
Calculate your retirement age, reduction coefficients and estimated pension for free. Updated simulator for voluntary and involuntary early retirement in Spain.
Free Invoice Generator for Freelancers and Small Business
Create professional invoices online for free. Fill in your details, add services, set sales tax and withholding, then generate a print-ready PDF. No account required.
IRPF Calculator: Net Salary Simulator Spain
Calculate your net monthly and annual salary for 2026 in Spain. Updated simulator with state, regional, MEI scales and family situation.
Meeting Cost Calculator Real Time Ticker
See in real time how much your meeting is costing. Enter the number of attendees and average salary to watch the dollar amount tick up every second.
NIE/NIF/CIF Verifier Spain: Spanish Tax ID Validator
Free tool to verify the validity of NIF (Spanish DNI), NIE (foreigners) and CIF (companies) in Spain. Checks the control digit and official format.
Professional Resignation Letter Generator
Create your personalized resignation letter in seconds. Professional templates ready to copy or download as PDF instantly.
Reverse VAT Calculator: Deduct VAT Spain
Online reverse VAT calculator. Break down VAT from any total amount to get the taxable base. Essential tool for freelancers and invoicing in Spain.
Salary Calculator Spain: Net Salary Simulator IRPF and Social Security
Discover how much you will actually earn each month. Accurate calculation of withholdings, taxable base and net income according to Spanish regulations.
Spain Severance Pay Calculator 2026
Calculate your gross settlement step by step: unused vacation days, bonus pay, and severance compensation based on Spanish labor law.
Practical and Multipurpose Online Tools
12 toolsDate Difference Calculator
Calculate exactly how much time has passed between two dates or how long until an event. Free tool with results in days, hours and minutes.
Google Drive Direct Download Link Generator
Easily convert any Google Drive share link into a direct download link with one click, bypassing the file preview. Free tool.
Email List Cleaner
Clean email lists for free. Remove duplicates, fix whitespace and validate formats in seconds. Save costs and improve your deliverability.
Environmental Badge Simulator Spain
Find out for free which Spanish DGT environmental badge applies to your car, motorbike or van for Low Emission Zones (ZBE) in Spain.
Morse Beacon: Tactical SOS Transmitter
Turn your device into a Morse transmission station. Use flash and screen as emergency light signals and tactical communication.
Secure Random Password Generator
Create strong, hack-proof passwords instantly. Free cybersecurity tool to generate random, secure keys.
Free Optimal Route Calculator
Optimize your delivery or travel routes for free. Our tool automatically reorders your stops to find the shortest and most efficient path.
Simple Rule of Three Calculator
Solve mathematical proportions instantly. The definitive tool for calculating quantities, recipes, discounts and conversions.
SEO Content Optimizer
Analyze keyword density, readability, and technical HTML structure of your texts in real time. Free and private SEO tool.
RSVP Speed Reader
Train your reading speed up to 1000 words per minute. RSVP technology with optimal focal point alignment. Double your intellectual productivity.
Text Pixel Width Calculator
Accurately calculate how wide any text is in pixels based on font, size and style. Free tool for designers and developers.
WhatsApp Link Generator with QR
Create direct WhatsApp chat links with pre-filled message and QR code. Free tool, no registration, 100% private.
Horology Tools & Reference Guides
25 toolsWatch Accuracy Tracker & Logger
Log and calculate the daily rate deviation of your mechanical or quartz watches to analyze precision and consistency.
Watch Wrist Presence & Sizing Calculator
Calculate the case-to-wrist ratio, flat wrist width coverage, and determine the ideal watch size for your wrist based on aesthetic guidelines.
Watch Demagnetizing Timer & Guide
A precise countdown timer with audio cues for DIY watch demagnetization. Get the exact press duration needed for your demagnetizing coil.
Watch Savings Goal Planner
Set and track savings goals for your next watch purchase. Visualize progress, calculate timelines, and stay motivated.
Watch Crown Reference Guide
Interactive guide to watch crown positions, winding directions, and setting functions for popular movements.
Watch Power Reserve Estimator
Estimate how much power reserve your watch has left based on crown turns and hours worn. Works with popular ETA, Sellita, Miyota, Seiko, and Rolex calibers.
Watch Beat Rate Converter: H to Hz & s/d Calculator
Convert vibrations per hour (VPH) to Hertz, ticks per second, and calculate the daily rate impact of a single lost tick. Works with ETA, Sellita, Miyota, Seiko, Rolex, Omega, and Zenith calibers.
Watch Water Resistance Converter: Meters, ATM, Bar and Feet
Convert watch water resistance ratings between meters, feet, ATM, and bar. See what each rating actually means for daily wear, swimming, and diving.
Watch Strap Taper & Proportions Calculator
Calculate the ideal strap taper for your watch based on case diameter and lug width. Find the perfect buckle width for a balanced look.
Watch Size Comparator: Visual Fit on Your Wrist
Compare watch case sizes visually. Enter diameter, lug-to-lug, and wrist size to see how a watch fits before you buy.
Lume Color Simulator: Watch Lume Visualizer
Visualize different lume colors in real time. Compare C1, C3, BGW9, LumiNova, and more across ambient brightness levels.
Moon Phase Visualizer: Lunar Calendar and Watch Complication Tool
Visualize the current moon phase, illumination, age, and upcoming full and new moons. Perfect for setting your moon phase watch complication.
Tachymeter Calculator: Speed from Elapsed Time
Calculate speed from elapsed time using the tachymeter formula. Works with any chronograph watch with a tachymeter bezel scale.
Watch Service Interval Tracker
Track and manage service intervals for your watch collection. Know when each watch is due for maintenance at a glance.
Watch Strap Length Calculator
Calculate the ideal strap size for your wrist. Get recommendations for two-piece and NATO straps based on wrist size and watch dimensions.
Telemeter Bezel Calculator: How to Use a Watch Telemeter
Learn how to use a telemeter watch bezel. Calculate distance from lightning to thunder or sound and flash events with automatic air temperature compensation.
Astronomical Sidereal Time Tracker: Local Sidereal Time Clock
Track Greenwich Mean Sidereal Time (GMST) and Local Sidereal Time (LST) with an artistic astronomical astrolabe watch face and real-time stellar drift simulator.
Watch Gear Train Explorer: Interactive Horology Diagram
Explore the mechanical heart of a watch with an animated gear train visualization. See the mainspring barrel, center wheel, third wheel, fourth wheel, escape wheel, pallet fork, and balance wheel in motion.
Perpetual Calendar Simulator: Interactive Watch Complication
Explore the mechanical genius of a perpetual calendar watch complication. Visualize date, day, month, leap year cycle, and moon phase with an animated dial.
Tourbillon: Art of the Rotating Escapement
Experience the mesmerizing art of the tourbillon - a rotating cage housing the escapement. Watch the balance wheel oscillate, the hairspring breathe, and the cage rotate in an elegant mechanical ballet.
World Clock: Live Multiple Time Zone Dashboard
Track multiple time zones live. Add any city and see its current time update every second. Perfect for watch enthusiasts with GMT or World Timer watches.
Quartz Battery Health Checker
Calculate the theoretical battery life of a quartz movement by entering the cell capacity (mAh) and the caliber power consumption (µA). Optionally set the installation date to estimate the replacement date.
Mainspring Finder
Calculate mainspring dimensions from barrel measurements for vintage watch movements.
Altitude Watch Accuracy Estimator: How Elevation Affects Your Mechanical Watch
Explore how altitude affects mechanical watch accuracy. Adjust elevation from sea level to mountain peak and see real-time changes in balance wheel oscillation, rate deviation, air density, pressure, and temperature.
Watch Crystal Material Comparison: Hesalite vs Mineral Glass vs Sapphire
Compare hesalite, mineral glass, and sapphire watch crystals side by side with interactive stat cards. See hardness, clarity, impact resistance, scratch resistance, and durability ratings to choose the best crystal for your watch.
Tabletop Game Utilities & Tools
16 toolsDice Roller & Probability Simulator
Roll virtual polyhedral dice (D4, D6, D8, D10, D12, D20, D100), add modifiers, and view live statistics and rolling probabilities for tabletop and board games.
Board Game Timer: Duel Chess Clock & Multiplayer Turn Manager
Track turns and manage time in your tabletop sessions with a professional board game timer. Supports Chess Clock duel mode, multiplayer layouts, Fischer increment, Bronstein delay, Hourglass, and detailed game metrics.
First Player Selector: Finger Chooser & Turn Roulette
Choose who goes first in your board games with this spectacular finger chooser and interactive turn roulette.
Score Tracker: Multiplayer Scorekeeper & Leaderboard Manager
Track scores for any tabletop game. Add players, record round-by-round scores, and watch the leaderboard update in real time with automatic rankings.
RPG Initiative Tracker: Combat Turn Order & Initiative Manager
Track initiative order for any tabletop RPG. Add combatants, roll initiative, manage status effects, and navigate turns in combat.
Fantasy Runes Translator / Elder Futhark, Theban, Enochian and Daemonic Rune Converter
Translate text into Elder Futhark, Anglo-Saxon Futhorc, Theban, Enochian, Daemonic, Ogham, or Fantasy scripts. Perfect for tabletop RPG puzzles, campaigns, wizard scrolls, and mystical runes.
Decision Wheel Spinner
Spin a customizable decision wheel for tabletop games. Add, remove, and edit segments to randomly determine outcomes.
Conspiracy Board Maker: Online Detective RPG Clue & Relationship Map Organizer
Design interactive digital conspiracy boards, virtual cork boards with red string, and RPG investigation maps. Connect clues, suspects, and locations for tabletop mystery campaigns.
Moon Phase Calculator for Tabletop RPG: Track Custom Fantasy Moons and Tidal Cycles
Calculate moon phases for any fantasy world with custom orbital periods. Track multiple moons at once, see 10-day forecasts, and get a combined tide level for magic and weather systems in D&D, Pathfinder, or any RPG.
Hidden Role Dealer: Secret Role Distributor
Distribute secret roles locally for social deduction games like Werewolf, Avalon, and Secret Hitler.
Scatter Direction Selector: Tabletop Wargaming Compass
Determine random deviations, wind drift, and scatter directions for miniature wargames using a 3D tactile compass.
Random Dungeon Map Generator for Tabletop Games
Create reproducible dungeon, cavern, and Sci Fi maps with connected rooms, doors, grid controls, and PNG or SVG export.
D&D 5e Encounter Difficulty Calculator
Estimate encounter pressure for D&D 5e 2014 using party level, group size, monster CR, monster count, adjusted XP, and official difficulty thresholds.
Character Token Maker for Tabletop RPGs
Forge readable character markers from portraits with expressive frames, draggable crops, labels, transparency, local saving, and batch PNG export.
Online Mus Scoreboard for Live Games
Track stones, amarracos, games and vacas with a fast Mus scoreboard for a real table. Choose 30, 40 or 50 points and keep the match on your device.
RPG Settlement and Exploration Map Generator
Generate a deterministic RPG settlement map with landscapes, architectural styles, smart services, connected roads, reactive water, contextual editing, share links, and PNG, SVG, and JSON export.
Book Publishing Utilities
1 toolForensic Science Tools
18 toolsDental, Skeletal, and Third Molar Age Estimator
Estimate a forensic age interval from dental development, skeletal maturity, and third molar indicators for screening and case triage.
Widmark Blood Alcohol Concentration Simulator
Calculate and simulate the absorption, distribution, and elimination of ethanol in the human body using the Widmark formula and a zero-order metabolism kinetics engine.
Forensic Anthropology Sex Determinator
Estimate biological sex from cranial and pelvic morphology indicators using a Bayesian probability model.
Forensic Stature Estimator
Estimate living height from human long bones using Trotter and Gleser regression equations, incorporating biological sex, ancestry, and age correction.
Forensic Presumptive Blood Test Simulator
Simulate presumptive blood testing using Kastle-Meyer and Luminol reagents. Distinguish real blood from common false positives like rust, bleach, and plant peroxidasas.
Forensic Image Metadata and Authenticity Analyzer
Inspect image headers, EXIF capture details, GPS coordinates, editing-software signatures, and raw bytes locally in your browser.
GSR Dispersion Distance Calculator
Simulate educational gunshot residue dispersion patterns across a target surface using firing distance, ammunition type, density decay, soot deposition, and radial particle spread.
Forensic TLC Ink Chromatography Simulator
Simulate thin-layer chromatography of questioned writing inks, visualize solvent-front development, separate dye bands, and calculate exact Rf values for each pigment.
Forensic Microcrystal Drug Test Simulator
Simulate educational microcrystalline drug screening patterns by combining suspected controlled substances with classic forensic reagents and comparing crystal habit, growth speed, and polarized-light response.
Forensic Glass Refractive Index Becke Line Simulator
Simulate the Becke line method for forensic glass comparison by heating an immersion liquid, matching refractive indices, and watching the bright halo disappear.
Forensic Fiber Comparison Microscope Simulator
Build a questioned textile fiber profile, compare it against known references, and interpret morphology, polarization, and UV-Vis dye evidence.
3D Bloodstain Pattern Origin Analyzer
Model elliptical bloodstains on a vertical plane, estimate impact angles, and visualize projected trajectories in an interactive 3D scene.
Forensic Fingerprint Pattern and Minutiae Identifier
Upload a fingerprint image, inspect it with a true magnifier, classify the ridge pattern, mark a controlled set of minutiae, and export an evidence table.
Fire Pattern Origin Analyzer
Map V-patterns, deep char, soot shadows, and clean burn indicators on a room plan, then project fire spread vectors to estimate the most likely area of origin.
Forensic Toolmark Striation Matcher
Upload questioned and known toolmark images, align them in a split comparison microscope, and inspect striation continuity with visual controls.
Time of Death Algor Mortis Calculator
Estimate postmortem interval and time of death using the Henssge nomogram method and body cooling thermodynamics.
Voice Spectrogram Analyzer Online
Reveal the frequency, time, intensity, and estimated formant patterns of two audio samples privately in your browser.
DNA Profile Match Probability Lab
Explore how allele frequencies and Hardy Weinberg genotype rules combine into an educational random match probability for a small STR profile.