BMI Calculator — Body Mass Index in Metric or Imperial
Calculate body mass index in metric or imperial units, with WHO categories and the Asian cut-offs. Free, no sign-up, and your files never leave your device.
Free, with no sign-up and no watermark. The file is processed in your browser and never uploaded.
Calculate your body mass index from height and weight in cm/kg or ft/in/lb. You get the WHO category, a healthy weight range for your height, and an option to use the lower cut-offs suggested for Asian populations.
Step by step
- Choose units: Select Metric (cm, kg) or Imperial (ft, in, lb).
- Enter height and weight: Fill in the fields — the BMI updates as you type.
- Optional Asian cut-offs: Tick the box to use 23 and 27.5 as the overweight and obese thresholds.
- Read your result: See your BMI, its category and the healthy weight range for your height.
Handy for
Health check-ins
Track BMI alongside other measures.
Fitness goals
See the weight range that counts as healthy for your height.
Forms
Some forms ask for BMI.
Education
Learn how BMI categories are defined.
Good to know
BMI doesn’t distinguish muscle from fat — athletes can show as overweight.
Questions
Is BMI accurate?
It’s a rough screening number for adults. It ignores muscle, age, sex and body shape and isn’t valid for children or pregnancy. This tool isn’t medical advice.
Why are there Asian cut-offs?
A WHO expert consultation found that health risks rise at lower BMI in many Asian populations, so lower thresholds (23 and 27.5) are often used.
Is anything sent to a server?
No. Every calculation runs in your browser, so the numbers you type never leave your device. The page keeps working offline once it has loaded.
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