How to Calculate BMI
Formulas
Metric: BMI = weight(kg) / (height(m))²
Imperial: BMI = 703 × weight(lb) / (height(in))²
Step-by-step examples
- 70 kg and 1.75 m → 70 / 1.75² = 22.9
- 155 lb and 66 in → 703 × 155 / 66² ≈ 25.0
Categories
| Category | BMI |
|---|---|
| Underweight | < 18.5 |
| Normal | 18.5 – 24.9 |
| Overweight | 25.0 – 29.9 |
| Obesity | ≥ 30.0 |
Ready to compute yours? Use the BMI Calculator.