Baby Calculators

Tools and calculators for the care and monitoring of your baby's development.

Baby Feeding Calculator

Calculate how much milk your baby needs based on weight and age. Recommended feeds, milliliters per feed, and hunger and fullness cues.

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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.

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WHO Percentile Calculator for Babies

Calculate your baby's weight, height and BMI percentile using WHO growth charts (0-5 years).

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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.

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Fertile Days Calculator

Calculate your fertile window and ovulation date based on your menstrual cycle.

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Pregnancy Weeks Calculator

Calculate exactly which week of pregnancy you are in, your trimester, and your estimated due date.

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Pregnancy Weight Gain Calculator

Estimate a healthy pregnancy weight gain range by gestational week using IOM and ACOG prenatal weight gain guidance.

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Labor Contraction Timer

Track contraction duration and frequency with a large touch button, guided breathing, history, and a 5-1-1 pattern alert.

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Baby Vaccination Calendar in Spain

Calculate the exact vaccination dates for your baby according to the AEP 2026 schedule.

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Available Tools

Feeding calculator by age and weight
Growth percentile calculator (WHO)
Clothing size converter by brand
Fertile days estimator
Personalized vaccination calendar
Pregnancy and gestation weeks calculator

# Monitoring Your Baby's Development

Baby calculators help you accurately track your child's growth and development. From calculating milk feeds by age and weight to checking WHO percentiles, these tools are designed to provide helpful information at every stage.

# Feeding and Nutrition

The feeding calculator estimates the amount of breast milk or formula your baby needs based on age in days, weeks, or months and current weight. Calculations follow standard pediatric guidelines to ensure proper nutrition.

# Growth and Percentiles

The percentile calculator uses World Health Organization (WHO) reference charts to plot your baby's weight, height, and BMI within the child population distribution. A 50th percentile indicates that the baby is at the median.