BMI Calculator
Calculate your BMI from height and weight, with WHO category and healthy weight range.
About this tool
Calculate your BMI from height and weight, with WHO category and healthy weight range. Your data never leaves your browser. Client-side processing with zero waiting. No accounts, no paywalls, no watermarks.
How to use
- 1
Type or paste your data in the input box
- 2
Choose your options and run the tool
- 3
Copy or download the result — done!
Frequently asked questions
▸How is BMI calculated here?
We use the standard formula BMI = weight ÷ height² — kilograms and metres in metric mode, and 703 × pounds ÷ inches² in imperial mode. The result is rounded to one decimal place.
▸Is my height and weight uploaded anywhere?
No. The calculation runs entirely in your browser and nothing is sent, stored or logged, so you can enter your real numbers without worrying about privacy.
▸Why doesn't BMI tell the whole story?
BMI only uses height and weight, so it cannot distinguish muscle from fat. Athletes, children, pregnant women and older adults should treat it as a rough screening figure, not a diagnosis.