BMI Calculator
Enter your height and weight to get your BMI, the WHO weight category, and the healthy weight range for your height.
How to use it
- Choose metric or imperial Switch units with the toggle.
- Enter your height and weight Use whole or decimal numbers.
- Read your BMI See your BMI, its category and a healthy weight range.
Examples
| 70 kg, 175 cm | 22.9 (normal) |
|---|---|
| 100 kg, 175 cm | 32.7 (obese) |
About this tool
Body mass index (BMI) is a quick way to estimate whether your weight is in a healthy range for your height. It is widely used because it needs only two simple measurements.
This calculator works in metric or imperial units and shows your BMI, the World Health Organization weight category, and the healthy weight range for your height.
BMI is only a general screening tool. It does not measure body fat directly or account for muscle, build or age, so it can be misleading for some people. It is not medical advice — for any health concerns, speak with a qualified professional. Your measurements stay in your browser.
Frequently asked questions
How is BMI calculated?
BMI is your weight in kilograms divided by the square of your height in metres. In imperial units it is 703 × pounds ÷ inches².
Is BMI accurate for everyone?
BMI is a rough screening tool. It does not distinguish muscle from fat and can be misleading for athletes, older adults and others. It is not a diagnosis.
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Updated June 12, 2026