BMI Calculator
Calculate your Body Mass Index (BMI) using metric or imperial units. See your health category and reference ranges.
Reference ranges
| Underweight | Under 18.5 |
| Normal weight | 18.5 – 24.9 |
| Overweight | 25.0 – 29.9 |
| Obese | 30.0 and above |
How It Works
Enter your height and weight in either metric (cm, kg) or imperial (ft/in, lb) units. The tool calculates your Body Mass Index using the standard formula (weight ÷ height²) and places the result in the WHO classification table, showing whether you fall in the underweight, normal, overweight, or obese range.
Use Cases
- Getting a quick baseline health metric at home
- Tracking BMI trend over time alongside a diet or exercise programme
- Understanding the WHO classification thresholds
- Comparing BMI between metric and imperial measurements