BMI Calculator
Calculate your Body Mass Index from height and weight.
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Body Mass Index (BMI) is a simple ratio of weight to height. Doctors use it as a quick screen for under- or over-weight in adults.
BMI (imperial) = 703 × lb ÷ in² BMI (metric) = kg ÷ m²
BMI is a screen, not a diagnosis. Athletes and people with high muscle mass can show 'overweight' BMIs while being lean.
Worked examples
Use the defaults above as a starting point — then adjust the inputs to match your situation.
- Double-check the units on every input — most errors come from mixing units.
- Round at the end, not in the middle of the formula.
Frequently asked questions
Related calculators
Estimate Basal Metabolic Rate — the calories your body burns at rest.
Calculate Total Daily Energy Expenditure — your real daily calorie burn.
Calculate your ideal weight range using the Devine formula.
Estimate body fat percentage using the US Navy method.
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