BMI calculator
Calculate your body mass index in metric or imperial units.
How it works
BMI is weight in kilograms divided by height in metres squared. It’s a general screening measure for adults and doesn’t account for muscle mass, age or body shape, so it isn’t a diagnosis.
Frequently asked questions
Is this tool free?
Yes. It’s free to use, with no account and nothing to install.
Is my data private?
Yes. This tool works entirely on your device: nothing you enter or open is sent to a server.
Does it work on a phone?
Yes. It works in the browser of any recent phone, tablet or computer.