Pregnancy & Baby Calculators

21 free pregnancy and baby calculators for due dates, ovulation, feeding, growth percentiles, and more. No signup required.

21 free tools

Due Date Calculator

Calculate your pregnancy due date from last menstrual period or conception date. See gestational age, trimester, and days remaining.

Pregnancy Week Calculator

Find out how many weeks pregnant you are from your LMP date. See your trimester, due date, and a weekly development milestone.

Ovulation Calculator

Find your ovulation date and 6-day fertile window from your last period and cycle length. Plan conception or track your cycle.

Baby Growth Percentile Calculator

Compare your baby's weight and height to WHO growth chart percentiles for ages 0-24 months.

Baby Feeding Calculator

Calculate recommended formula or breast milk amounts by baby age and weight. See ounces per feed and when to start solids.

Pregnancy Weight Gain Calculator

Get personalized pregnancy weight gain recommendations by pre-pregnancy BMI using IOM guidelines.

Period Calculator

Predict your next 6 period start and end dates based on your last period and cycle length.

Child Height Predictor

Predict your child's adult height using the mid-parent method. Enter both parents' heights for a range estimate.

Conception Date Calculator

Work backwards from your due date to estimate your conception date, LMP, and fertile window.

Diaper Calculator

Estimate daily diaper use and monthly cost from newborn through toddler. See how many diapers per day by age.

Baby Sleep Schedule Calculator

Find out how much sleep your baby needs by age, nap count, wake windows, and get a sample daily schedule.

Breast Milk Storage Calculator

Enter when you pumped and where you are storing breast milk. Get the exact use-by date and hours remaining based on CDC guidelines.

Baby Clothes Size Chart

Convert baby clothing sizes between US, UK, and EU systems. Find the right size by age or weight. Preemie through 24M/2T.

Baby Eye Color Predictor

Predict baby eye color probabilities from both parents eye colors using simplified Mendelian genetics. Shows brown, green, and blue percentages.

Implantation Calculator

Calculate your implantation window and earliest hCG detection date from ovulation, IUI, or IVF transfer date.

Baby BMI Calculator

Calculate BMI for babies and toddlers with approximate percentile category. Includes weight-for-length note for children under 2 years.

Contraction Timer

Time labor contractions with one tap. Tracks duration, frequency, and average intervals. Alerts when you meet the 5-1-1 rule.

IVF Due Date Calculator

Calculate your due date from embryo transfer date. Works for Day 3 and Day 5 blastocyst transfers. Shows LMP equivalent and gestational age.

Chinese Gender Predictor

Traditional Chinese gender prediction chart by mother age and conception month. For entertainment only. Instant results, no signup.

Bottle Warming Calculator

Find out how long to warm a baby bottle by method and starting temperature. Includes safety tips and microwave warning.

Toddler Shoe Size Chart

Convert toddler foot length to US, UK, and EU shoe sizes in cm or inches. Covers newborn through 4 years with age range guide.