BMI Calculator
Calculate your body mass index and the healthy weight range for your height, in metric or imperial units.
Use the BMI Calculator
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How to use the BMI Calculator
- Choose metric or imperial units.
- Enter your weight and height.
- Tick the South Asian cut-offs if they apply to you.
- Read your BMI, category and healthy weight range.
About this tool
BMI = weight in kg ÷ (height in m)². WHO adult categories are under 18.5 underweight, 18.5–24.9 healthy, 25–29.9 overweight and 30 or more obesity. A WHO expert consultation (2004) suggested lower action points of 23 and 27.5 for many Asian populations.
Free to use. Your inputs are processed in your browser and are not sent to our servers. Results are for general information; see the disclaimer.
Frequently asked questions
Is BMI accurate for everyone?
No. BMI does not measure body fat, so it can mislead for muscular people, older adults and during pregnancy. Use it as a screening guide only.
Why are there South Asian cut-offs?
Research suggests health risks rise at a lower BMI in many Asian populations, so a WHO expert group proposed lower cut-off points.
Can children use this?
No. Children and teenagers need age- and sex-specific BMI charts. This calculator is for adults.