BMI Calculator
Calculate adult body mass index from weight and height.
Health & fitness
3 free tools
Health & fitness calculators
Understand estimates about your body and the limits of each formula.
These tools estimate body mass index, daily calorie needs, and body fat percentage. Check the units, age requirements, and the population a formula is intended for before interpreting a result. A difference between two results does not necessarily mean your health has improved or declined.
Calorie Calculator
Estimate daily energy needs using the Mifflin–St Jeor equation.
Health & fitness
Body Fat Calculator
Get a rough body fat estimate from body measurements using the U.S. Navy method.
Health & fitness
Before you start
- Enter height in centimeters and weight in kilograms when the tool requests those units.
- These are general estimates for adults, not a medical diagnosis or treatment plan.
- The formulas may not suit children, pregnant people, athletes, or people with certain health conditions.