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BMI Calculator

Your body mass index (BMI), its category, and the healthy weight range for your height.

Runs in your browser · No uploads

Units
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For adults aged 20 and over. BMI doesn't tell muscle from fat, and it isn't meant for children, teenagers or pregnancy. It is a screening number, not a diagnosis: talk to a doctor about your health.

  • Nothing leaves your device
  • No server-imposed size limits
  • No sign-up, no watermark
  • Free

How to calculate your BMI

  1. Choose metric or US units.
  2. Enter your weight and height.
  3. Read your BMI, its category and your healthy weight range.

BMI categories for adults

BMICategory
Below 18.5Underweight
18.5 to 24.9Healthy weight
25 to 29.9Overweight
30 and overObesity

What BMI doesn't tell you

BMI is weight divided by height squared. It doesn't tell muscle from fat, so athletes can score high, and it isn't meant for children, teenagers or pregnancy. Some health services, for example in India and other parts of Asia, use lower cut-offs (23 and 27.5). Treat it as a starting point and talk to a doctor about your health.

Frequently asked questions

Is anything sent anywhere?

No. The calculation happens in your browser, and your weight and height never leaves your device.