BMI Calculator
Body Mass Index from height and weight, with category.
How to use the BMI tool
- Enter your bmi in the fields above.
- Adjust any slider or type an exact number — the answer updates as you go.
- Copy the result and close the tab. Nothing you entered was sent anywhere.
About the BMI tool
Enter height and weight in metric or imperial units to get your BMI and the standard WHO category — underweight, normal, overweight or obese.
BMI is a rough screening tool, not a diagnosis. It does not distinguish muscle from fat and can misclassify athletes and older adults.
Everything runs locally in your browser: no data is uploaded, no account is needed, and it works offline once the page has loaded.
Embed this tool
Customize and copy an iframe. Linking back helps both sites.