Calculator
BMI Calculator
Calculate Body Mass Index from height and weight using metric or imperial units. See WHO adult category ranges. BMI is a screening tool only — not a medical diagnosis.
Body Mass Index
Enter weight and height to see BMI and the WHO adult category band.
Your BMI
22.90.0
Normal weight
Healthy weight for this height (WHO 18.5–24.9): 56.7–76.3 kg
Useful for
Related calculators
Privacy & limitations
Files are processed in your browser and are not uploaded to our servers.
Your files stay on your device. We do not store or access your documents.
Guides, tips & FAQ
What is BMI?
Body Mass Index compares weight to height squared. The World Health Organization publishes adult category bands used widely for population screening — not as a complete health diagnosis.
Formulas
Metric: BMI = kg / m² | Imperial: BMI = 703 × lb / in²
Height in meters = cm ÷ 100. Imperial height can be entered as feet + inches (converted to total inches).
Worked example
- Weight = 70 kg
- Height = 175 cm = 1.75 m
- BMI = 70 / (1.75 × 1.75) ≈ 22.9
- Category: Normal weight (18.5–24.9)
WHO adult categories
| Category | BMI (kg/m²) |
|---|---|
| Underweight | Below 18.5 |
| Normal weight | 18.5 – 24.9 |
| Overweight | 25.0 – 29.9 |
| Obese | 30.0 and above |
Related tools
Convert height or weight units first with the unit converter. More definitions in the glossary.