Health
BMI Calculator
Calculate body mass index from height and weight.
BMI
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Category
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FAQ
- How is BMI calculated?
- Metric: BMI = weight (kg) / height (m)^2. Imperial: BMI = 703 * weight (lb) / height (in)^2. Both formulas yield the same result when units are converted consistently.
- What are the WHO BMI categories?
- Underweight: below 18.5. Normal weight: 18.5 to 24.9. Overweight: 25 to 29.9. Obese: 30 and above. These thresholds apply to most adults but may differ for children, athletes, or certain ethnic groups.
- Is my data sent anywhere?
- No. All calculations run entirely in your browser. Nothing is uploaded or stored.