BMI calculator
Calculate body mass index from height and weight in metric or imperial units.
🔒 Everything runs in your browser. Nothing you choose or type is uploaded. How to verify
How to use it
- Choose metric or imperial units.
- Enter your height and weight.
- Read the BMI and category, which update as you type.
Handy for
A quick check of height and weight before talking to a health professional.
Good to know
BMI ignores muscle, age and body shape, so it can mislead for athletes, older adults and growing children. Treat it as a rough guide.
Privacy: where the work happens
Everything you enter or choose is processed by JavaScript in your browser and never sent anywhere. Only the page code, and any library this tool needs, is downloaded from cdnjs or jsDelivr.
Questions
Which categories are used?
The adult categories used by the World Health Organization: below 18.5, 18.5 to 24.9, 25 to 29.9 and 30 or more.
Is BMI a diagnosis?
No. It is a simple screening number. Ask a health professional about your own health.