Free women’s health calculators for cycle tracking, fertility, pregnancy timing, body composition and daily calorie needs. Everything runs in your browser — nothing is uploaded or stored.
Cycle & period tracking
- Period Calculator — next period date and a six-month forecast.
- Cycle Length Calculator — average cycle length and regularity from your real dates.
- Ovulation Window Calculator — fertile window and ovulation day from your last period.
Fertility & pregnancy timing
- Conception Date Calculator — work backwards from a due date or forwards from your last period.
- Pregnancy Test Calculator — the earliest date a home test can detect hCG.
- Pregnancy Due Date Calculator — due date, current week, day and trimester.
Body composition & nutrition
- Waist-to-Hip Ratio Calculator — WHO risk bands in cm or inches.
- BMR & TDEE Calculator — Mifflin-St Jeor resting burn, maintenance and a safe calorie target.
- BMI Calculator — body mass index from height and weight.
- Body Fat Tape Measure — tape-based body fat estimate.
- Ideal Weight Range Calculator — a healthy weight span for your height.
- Daily Water Intake Calculator — how much water you need.
Fitting & measurements
- Bra Size Calculator — modern snug sizing and sister sizes.
- Women’s Clothing Size Converter — US, UK, EU and AU sizing.
- Women’s Shoe Size Converter — US, UK, EU, CM and inch conversions.
- Ring Size Converter — US, UK, EU, JP and mm.
These tools are estimates, not medical advice. Cycle dates, conception windows and body metrics are population averages and can be wrong for any individual. If something looks off, or you have a medical question, talk to a clinician.