Calculate Body Mass Index from height and weight, with WHO category context.
Calculate Body Mass Index from height and weight, with WHO category context.
Enter values above and click Calculate — results will appear here with the formula explained.
Body Mass Index divides weight by squared height to place people on a single comparable scale. The World Health Organization bands it as under 18.5 (underweight), 18.5–24.9 (healthy), 25–29.9 (overweight) and 30+ (obesity).
Its strengths are simplicity and population-level usefulness; its limits are equally real. BMI ignores body composition entirely — muscular athletes routinely score 'overweight' — and research suggests health risk patterns differ across ethnic groups at the same BMI. Treat it as one signal among many, not a diagnosis.
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Body Mass Index divides weight by squared height to place people on a single comparable scale. The World Health Organization bands it as under 18.5 (underweight), 18.5–24.9 (healthy), 25–29.9 (overweight) and 30+ (obesity). Formula: BMI = weight (kg) ÷ height² (m)
BMI Calculator: Calculate Body Mass Index from height and weight, with WHO category context. Formula: BMI = weight (kg) ÷ height² (m). Example: 70 kg at 175 cm: 70 ÷ (1.
Calculate Body Mass Index from height and weight, with WHO category context. Formula: BMI = weight (kg) ÷ height² (m)
| Field | What to enter |
|---|---|
| Weight (kg) | e.g. 70 |
| Height (cm) | e.g. 175 |
All fields use the exact formulas shown below — results include step-by-step breakdowns you can verify by hand.
Body Mass Index divides weight by squared height to place people on a single comparable scale. The World Health Organization bands it as under 18.5 (underweight), 18.5–24.9 (healthy), 25–29.9 (overweight) and 30+ (obesity).
Its strengths are simplicity and population-level usefulness; its limits are equally real. BMI ignores body composition entirely — muscular athletes routinely score 'overweight' — and research suggests health risk patterns differ across ethnic groups at the same BMI. Treat it as one signal among many, not a diagnosis.
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70 kg at 175 cm: 70 ÷ (1.75 × 1.75) = 22.9 — comfortably inside the healthy band, which for this height spans roughly 56.7–76.3 kg.
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