INTERACTIVE TOOL
Adult BMI calculator
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How to use this tool
- Use this tool only for an adult.
- Enter weight in kilograms and height in centimetres.
- Read the result as a mathematical ratio, not a diagnosis.
Formula or method usedBMI = weight in kilograms ÷ height in meters squared.
Worked example
The tool divides weight by squared height in metres. Mixing centimetres and metres changes the result.
Assumptions and limits
BMI alone does not assess health or body composition and this tool is not intended for children or clinical decisions.
Frequently asked questions
Can someone under 18 use this calculator?+
Adult BMI should not be interpreted for minors; age-specific charts and professional guidance are needed.
What happens to my inputs?+
Calculation inputs are processed locally in your browser. Favorites and preferences may be saved on this device. The site may perform separate network requests for live panels; these do not include the values entered into this local calculator. Do not paste secrets into public tools.
How should I check the result?+
BMI alone does not assess health or body composition and this tool is not intended for children or clinical decisions.