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.
Ideal Weight
Your ideal weight by 4 formulas (Devine, Robinson, Miller, Hamwi) + healthy range.
Body Fat %
Body-fat percentage via the U.S. Navy circumference method.
Water Intake
Daily water needs based on weight and physical activity.
Due Date
Estimated due date by Naegele’s rule + current gestational age.
Ovulation
Ovulation and fertile window from your menstrual cycle length.
Calories in Foods
Calories and macros per 100 g for 195 foods — from banitsa to quinoa.
Frequently asked questions
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.