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Calculate adult BMI from height and weight. The result shows a WHO screening category but does not diagnose health or body composition.
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metric or imperial
centimetres or feet and inches
kilograms or pounds
adult screening category
BMI = weight in kilograms ÷ height in metres²imperial inputs are converted to kilograms and metresWHO adult ranges: below 18.5; 18.5–24.9; 25–29.9; 30 and aboveWorked example
An adult weighs 81 kg and is 180 cm tall.
No. BMI is a screening measure and does not directly measure body fat, body composition or health.
No. Under 18, BMI requires age- and sex-specific growth charts.
For example in very muscular adults, pregnancy, older age or unusual body composition.
Available actions follow the calculator privacy policy. Sensitive inputs are never added to the page URL; an explicitly saved scenario stays local.
No. The calculation runs locally in your browser and is not stored in a database.
Adult BMI in kilograms and centimetres or pounds, feet and inches, with WHO screening thresholds.
