BMI Calculator
Enter your height and weight in metric or imperial units to see your BMI, the category it falls in and the healthy weight range for your height.
Runs in your browser. Your files never leave your device.
How it works
- 01Choose metric or imperial.
- 02Enter your height and weight.
- 03Read your BMI and healthy range.
Tips and common mistakes
How BMI is worked out
BMI is weight in kilograms divided by height in metres squared. The usual adult ranges are under 18.5 for underweight, 18.5 to 24.9 for a healthy range, 25 to 29.9 for overweight and 30 or more for obese. Some health guidance for South Asian adults uses lower cut-offs.
It is a screening number, not a diagnosis
BMI does not tell muscle from fat, and it does not consider age or build. Use it as a rough guide and talk to a doctor about your own health.
Questions
Is BMI accurate?
It is a rough screening guide. It ignores muscle, age and body build, so talk to a doctor for health advice.
Is my file uploaded to a server?
No. Everything happens inside your browser on your own device. Your files are never sent to us or anyone else.
Is it free?
Yes. It is free to use, with no signup, no watermark and no daily limit.