Health & Pregnancy Calculators

A small category, but three calculators people reach for constantly. The pregnancy due date tool gives your due date and gestational age in weeks and days from your last period, your conception date or an ultrasound scan, and shows dates in the Buddhist era too. The ovulation calculator estimates your ovulation day, your fertile window and the start of your next few periods. The TDEE and BMR calculator uses the Mifflin-St Jeor formula to show how much energy your body burns each day, with calorie targets for losing or gaining weight. All three run entirely in your browser, so your dates and body measurements never leave your device — and every result is an estimate, not a medical diagnosis.