BMI Calculator
Estimate your Body Mass Index using your weight and height. Supports metric (kg / cm) and imperial (lb / ft / in).
Standard BMI formula
Metric & imperial
Instant estimate
How this works:
- For metric: BMI = weight (kg) / [height (m)]².
- For imperial: BMI = 703 × weight (lb) / [height (in)]².
- Returns a single number and a basic category label.
BMI is a rough population-level index. It does not distinguish muscle from fat
and can be misleading for individuals. It does not replace a proper
clinical assessment or body composition measurement.
| Category | BMI range |
|---|---|
| Underweight | < 18.5 |
| Normal range | 18.5 – 24.9 |
| Overweight | 25.0 – 29.9 |
| Obesity (class I) | 30.0 – 34.9 |
| Obesity (class II) | 35.0 – 39.9 |
| Obesity (class III) | ≥ 40 |
Enter your details
Units:
Weight
kg
Height
cm
Body Mass Index (BMI)
--
kg/m²
Enter your details above and tap “Calculate” to see an estimated BMI and category.
BMI is a single index only. Always use it alongside proper medical advice and
more detailed measures such as body fat percentage, lab work, and clinical review.
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