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BMI Calculator

Calculate adult body mass index, weight category and a BMI based healthy weight range with US or metric inputs.

Enter your measurements and health details

Use current, consistently measured values for the bmi calculation. Results update automatically and are intended for education and planning, not diagnosis.

Unit system

Weight

lb or kg

Height

in or cm

Age

years

BMI—

Adult BMI category—

BMI based healthy weight range—

Distance from nearest healthy range boundary—

Important: Health results are educational screening and planning estimates. They are not a diagnosis and are not a substitute for medical care.

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How to use this calculator

Using the calculator

Enter Unit system, Weight, Height, Age. Calculate adult body mass index, weight category and a BMI based healthy weight range with US or metric inputs.

Reading the result

The BMI result compares body weight with height using the standard BMI formula. It is a screening estimate, not a diagnosis or direct measure of body composition.

How it is calculated

BMI relates body weight to height squared. In metric units the formula is weight in kilograms divided by height in meters squared. The resulting number is a screening measure and does not directly measure body fat.

Results are estimates based on the values entered. Review the Methodology and Calculator Disclaimer for important limitations.

Common questions

Does BMI measure body fat?

No. BMI relates weight to height squared. It is a screening measure and does not directly measure body fat, muscle mass or overall health.

Can two people with the same BMI have different body composition?

Yes. People with the same BMI can differ in muscle, fat distribution, age and other characteristics. BMI should be interpreted as broad context rather than a complete health assessment.

Should I use BMI to diagnose a health condition?

No. A calculator cannot diagnose a health condition. Use a healthcare professional for diagnosis, symptoms, treatment or individualized medical decisions.