Free Health & Fitness Calculators
BMI, calorie, BMR, body fat, due date and ovulation calculators.
All 7 health & fitness calculators
Pick a tool to get started — every one is free and works in your browser.
BMI Calculator
Calculate your Body Mass Index in kg/cm or lb/ft.
Open toolDue Date Calculator
Estimate your baby’s due date and how far along you are.
Open toolOvulation Calculator
Find your fertile window and ovulation day.
Open toolCalorie Calculator
Daily calories (TDEE) to maintain, lose or gain weight.
Open toolBMR Calculator
Basal metabolic rate: calories burned at rest.
Open toolBody Fat Calculator
Body fat percentage with the US Navy tape method.
Open toolIdeal Weight Calculator
Ideal body weight for your height, with four formulas.
Open toolAbout our health & fitness calculators
Simple, reliable health calculators for everyday questions. Check your BMI and ideal weight, work out how many calories you need to lose weight, estimate your body fat with a tape measure, or find your pregnancy due date and fertile days.
Every calculator uses established medical formulas — such as Mifflin-St Jeor for calories and the US Navy method for body fat — and works in US or metric units. Results are estimates for information, not medical advice.