Health Calculators

BMI and calories, ideal weight, body fat, water intake, due date and ovulation — free and in your browser.

BMI & Calories

Body mass index, BMR and daily calories (TDEE) via Mifflin-St Jeor.

Your ideal weight by 4 formulas (Devine, Robinson, Miller, Hamwi) + healthy range.

Body-fat percentage via the U.S. Navy circumference method.

Daily water needs based on weight and physical activity.

Estimated due date by Naegele’s rule + current gestational age.

Ovulation and fertile window from your menstrual cycle length.

Important: These calculators are for general information only and do not replace advice from a doctor.

Are the health calculators free?

Yes. Every calculator is free, needs no account, and runs entirely in your browser — nothing is sent to a server.

Do they replace medical advice?

No. The tools are for general information only and are not a medical diagnosis or advice. Consult a doctor with any concerns.