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BMI Calculator
Check your body mass index in metric or imperial units and see which WHO weight category it falls into.
Body mass index
BMI: —
Category: —
Healthy weight range for your height: —
How to use the BMI Calculator
- Choose metric or imperial units from the dropdown.
- Enter your height and weight in the fields shown.
- Read your BMI, the WHO category and the healthy weight range for your height.
Features
- Metric and imperial input
- World Health Organization categories
- Healthy weight range for your height
- Live results as you type
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Frequently Asked Questions
Common questions about the free online bmi calculator.
Body mass index is a simple ratio of weight to height. It is used as a rough screening
measure for underweight, healthy weight, overweight and.
Metric BMI is weight in kilograms divided by height in metres squared. The imperial version
uses pounds and inches, then multiplies by 703.
Underweight is below 18.5, normal weight is 18.5 to 24.9, overweight is 25 to 29.9, and
obesity is 30 or above.
No. Children and teenagers need age and sex specific growth charts, so the adult bands shown
here do not apply to them.
Not always. Muscle is denser than fat, so very muscular people can register a high BMI
without having excess body fat.
Pick the unit system from the dropdown. Metric takes centimetres and kilograms, while
imperial takes feet, inches and pounds.
The tool shows the weight range that corresponds to a BMI between 18.5 and 24.9 for the
height you entered.
No. Your height and weight are used only in your browser and are never sent anywhere.
Yes. It is free to use, and no account, e-mail address or sign-up is needed.
Last updated: October 10, 2026