Horology Tools & Reference Guides

Professional-grade horology utilities for watch enthusiasts-ack accuracy, demagnetize movements, calculate wrist presence, and explore crown position references for popular calibers.

Watch Accuracy Tracker & Logger

Log and calculate the daily rate deviation of your mechanical or quartz watches to analyze precision and consistency.

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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.

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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.

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Watch Savings Goal Planner

Set and track savings goals for your next watch purchase. Visualize progress, calculate timelines, and stay motivated.

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Watch Crown Reference Guide

Interactive guide to watch crown positions, winding directions, and setting functions for popular movements.

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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.

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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.

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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.

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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.

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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.

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Lume Color Simulator: Watch Lume Visualizer

Visualize different lume colors in real time. Compare C1, C3, BGW9, LumiNova, and more across ambient brightness levels.

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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.

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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.

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Watch Service Interval Tracker

Track and manage service intervals for your watch collection. Know when each watch is due for maintenance at a glance.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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Mainspring Finder

Calculate mainspring dimensions from barrel measurements for vintage watch movements.

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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.

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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.

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# Essential Tools for Watch Enthusiasts

Whether you are regulating a mechanical movement, demagnetizing a recently magnetized watch, tracking how often you wear a timepiece, or learning the crown positions of your favorite caliber, this suite puts professional-grade horology tools at your fingertips- expensive equipment required.

# Accuracy, Demagnetization & Crown References

From tracking daily rate deviation against atomic time to safely demagnetizing a movement with precise timing, from knowing exactly when you last wore a watch to understanding every crown position on an ETA or Miyota caliber-ese tools cover the day-to-day needs of any collector or enthusiast.
4 Tools
8+ Calibers
15 Languages
Local Data Privacy