All HerCalc calculators
Seven free women’s health calculators — every one of them runs entirely in your browser. No accounts, no tracking, no email walls.
fertility
Ovulation Calculator
Find your most fertile days, ovulation date and implantation window. Supports cycles 15–50 days and irregular-cycle prediction. Save fertile days to your calendar.
Safe Period Calculator
A safe-period (rhythm method) calculator with a cycle-variation input for higher accuracy. Plus a clear chart of when this method does — and doesn’t — work.
pregnancy
Due Date Calculator
Calculate your estimated due date by LMP, conception date, ultrasound (CRL or weeks+days) or IVF transfer (Day 3, 5, or 6). Plus current gestational age and key prenatal-visit dates.
Pregnancy Week Calculator
Find out how many weeks pregnant you are, what trimester you’re in, and how weeks convert to months. Includes a fetal-size visual and a week-by-week milestone calendar.
Body & wellness
BMI Calculator
BMI calculator with adjustments for life stage — pregnancy, postpartum, menopause — and an age-adjusted view. Returns BMI, BMI Prime, Ponderal Index, healthy range and waist-to-hip-ratio.
Body Shape Calculator
Find your body shape with the FFIT 7-type system (Hourglass, Pear, Apple, Rectangle, Inverted Triangle, Spoon, Top Hourglass). Plus waist-to-hip ratio and outfit guidance per shape.