BMI Calculator
Calculate body mass index from height and weight, in centimetres and kilograms or inches and pounds. As well as the number and its category, you get the healthy weight range for your height expressed in your own units — usually more useful than the index itself, since it tells you what the number actually means for you.
Your BMI
22.9
- Category
- Healthy weight
- Healthy weight range
- 56.7–76.3 kg
BMI doesn't distinguish muscle from fat, and it isn't valid for children, pregnancy or athletes. It's a population screening tool, not a diagnosis.
Nothing is uploaded — this tool runs inside your browser, so your files never leave your device.
Why use this tool
- Metric and imperial, with the correct formula for each
- Shows your category against the standard WHO thresholds
- Converts the healthy BMI band back into kg or lb at your height
- Runs on your device — no health data is uploaded anywhere
How it works
- 1Choose metric or imperial units.
- 2Enter your height and weight.
- 3Read your BMI, your category, and the healthy range for your height.
BMI Calculator — frequently asked questions
Between 18.5 and 24.9 is classed as healthy weight, under 18.5 underweight, 25 to 29.9 overweight, and 30 or above obese. These are the World Health Organization thresholds used by most health services.
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