BMI Calculator
The Body Mass Index (BMI) calculator estimates your leanness or corpulence from height and weight, following the WHO classification for adults. It also returns BMI Prime, the Ponderal Index and the healthy weight range for your height.
TheCalculators — BMI Calculator
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BMI
20.1 kg/m²
Normal · Healthy BMI range 18.5 – 25 kg/m²
- Category
- Normal
- Healthy weight for height
- 59.9 – 81.0 kg (132 – 179 lb)
- BMI Prime
- 0.80
- Ponderal Index
- 11.1 kg/m³
- Height / Weight
- 180.0 cm · 65.0 kg
BMI classification (WHO)
20.1kg/m²
Normal
WHO BMI classification for adults
Children and teens (2-19) are assessed with CDC BMI-for-age percentiles instead.
Estimates for informational purposes only — not medical advice.
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Formula
BMI = weight (kg) / height (m)² · BMI Prime = BMI / 25 · Ponderal Index = weight (kg) / height (m)³
- • Convert height to metres and square it.
- • Divide weight in kilograms by the squared height.
- • Compare against WHO bands: under 18.5, 18.5-25, 25-30, 30+.
Pro tips
- • BMI does not distinguish muscle from fat — athletes often score "overweight" while being lean.
- • A healthy weight target is any weight that puts your BMI between 18.5 and 25.
FAQ
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