BMI Calculator
Calculate body mass index from height and weight in metric or imperial units, with the standard WHO category bands.
Good to know
- BMI is a screening number, not a diagnosis; muscle mass, age and body composition are not part of it.
Common questions
Is BMI a diagnosis?
No. It is a screening number. Muscle mass, age, sex and body composition are not part of the formula.
Why does BMI stay the same after switching units?
Switching cm/kg to in/lb converts the height and weight values, so the same person keeps the same BMI.
Which BMI bands are used?
The standard WHO screening bands: under 18.5, 18.5-24.9, 25-29.9 and 30 or above.
Is this tool really free?
Yes. There is no account, no paywall and no usage limit. Tools App is funded by aumenso, the studio behind it.
Is anything I enter uploaded?
No. The tool runs in your browser tab; what you enter is never sent to us and never stored.
Need this built for your business?
aumenso builds websites, branding, SEO, GoHighLevel funnels and custom software for agencies and businesses across North America and Europe. These tools are the same team's work, given away free.