BMI Calculator
Metric & Imperial
Calculate your Body Mass Index instantly. See your category, healthy weight range, and what it means.
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Underweight
Normal
Overweight
Obese
Healthy Weight Range
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Weight to Lose / Gain
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Your Height
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Your Weight
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BMI Classification (WHO)
| Category | BMI Range | Health Risk |
|---|---|---|
| Underweight | < 18.5 | Malnutrition risk |
| Normal weight | 18.5 – 24.9 | Low risk |
| Overweight | 25 – 29.9 | Moderate risk |
| Obese | ≥ 30 | High risk |
What is BMI?
Body Mass Index (BMI) is a simple number derived from your height and weight. It's widely used as a screening tool to identify potential weight-related health risks. The formula is: BMI = weight (kg) ÷ height² (m²).
BMI is a useful population-level indicator but doesn't distinguish between muscle mass, bone density, or fat distribution. Athletes may have a high BMI due to muscle. Use it as a starting point, not a diagnosis.