Compute Body Mass Index from height and weight in metric or imperial. Fully client-side — no account, uploads, or remote storage.
Added Apr 18, 2026 · Updated May 1, 2026
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Enter a value for height to see your result.
The Body Mass Index (BMI) is a measure of body fat based on your weight in relation to your height. It is a screening tool to determine if a person is at a healthy weight range.
BMI = weight (kg) / height² (m)
A 1.75m tall adult weighing 70kg has a healthy BMI of 22.9.
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A healthy BMI is typically between 18.5 and 24.9. A BMI of 25-29.9 is considered overweight, and 30+ is obese.
BMI uses only height and weight. Muscle is denser than fat, so strength athletes can land in overweight or obese categories despite low body fat. Waist circumference, body composition scans, or performance metrics may be better secondary checks.
Population cutoffs were largely developed from certain cohorts. Some health authorities suggest different action thresholds for South Asian, Asian, or older adults. Treat BMI as a screening flag, not a diagnosis.
Pediatric BMI is interpreted with age- and sex-specific growth charts. This adult-oriented calculator is not a substitute for percentile-based pediatric screening.
Use it as one input alongside energy balance, waist size, blood pressure, glucose, sleep, and how you feel in training. A registered dietitian or clinician can help set realistic targets for your context.