BMI Calculator

Calculate body mass index from height and weight in metric or imperial units, see your category and the healthy weight range for your height.

Your Measurements

Your BMI

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Enter your height and weight

BMI is a screening estimate for adults, not a diagnosis. It does not measure body fat, so talk to a health professional about your health.

  • On your device
  • Works offline after first use
  • Instant
  • Current versions of Chrome, Edge, Firefox and Safari on desktop, Android and iPhone.
  • Works offline after first use
  • Trust Center

About BMI Calculator

Body mass index (BMI) compares weight with height. Enter yours in kilograms and centimetres, or pounds, feet and inches, and see your BMI, the weight category and the weight range that counts as healthy for your height.

How to use the BMI Calculator

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

Why use this tool?

  • Private: your numbers stay in your browser.
  • Uses the standard World Health Organization adult categories.
  • Shows the healthy weight range for your height, not just a single number.
  • Free, with no sign-up, watermark or limits.

Frequently Asked Questions

BMI is weight in kilograms divided by height in metres squared. In imperial units it is 703 times weight in pounds divided by height in inches squared.

For adults, a BMI from 18.5 to 24.9 is considered the healthy range. Below 18.5 is underweight, 25 to 29.9 is overweight and 30 or more is obese.

BMI is a screening estimate. It does not measure body fat, so it can mislead for athletes, older adults and children. It is not a diagnosis, so talk to a health professional about your health.

No. Children and teenagers use age and sex based percentiles, so this calculator is for adults aged 20 and over.

On your device. The tool runs inside your browser, so your files are not uploaded to Quickaboo.

Current versions of Chrome, Edge, Firefox and Safari on desktop, Android and iPhone.