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BMI Calculator

Calculate body mass index in metric or imperial units, with the WHO categories.

To calculate BMI, enter your weight and height in metric or imperial units. BMI is weight in kilograms divided by height in metres squared, and the result is placed into the World Health Organization categories along with the healthy weight range for your height.

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Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Is BMI accurate for everyone?

No. It was designed to describe populations, not individuals. It cannot distinguish muscle from fat, so athletes often register as overweight, and it under-estimates body fat in older adults who have lost muscle.

What is a healthy BMI?

The WHO defines 18.5 to 24.9 as healthy for adults. Some health bodies use lower thresholds for South Asian populations, where cardiometabolic risk rises at a lower BMI.

How to use the bmi calculator

  1. 1Choose the units.
  2. 2Set the weight.
  3. 3Set the height.
  4. 4Set the inches.
  5. 5The result appears immediately — copy or download it.

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Put the working bmi calculator on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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