BMI Calculator
Body mass index from height and weight, in metric or imperial units.
Runs entirely in your browser. Nothing you type is uploaded.
About this tool
Enter height and weight in metric or imperial units to get the body mass index and the standard adult category. BMI is a rough population-level screening number: it does not distinguish muscle from fat and does not apply to children, athletes or pregnancy.
Questions & answers
- How is BMI calculated?
- Weight in kilograms divided by height in metres squared. Imperial input is converted first, so the result is identical either way.
- Is BMI a health diagnosis?
- No. It is a screening ratio for adults and says nothing about body composition or health on its own. Talk to a clinician about what it means for you.
- Does this tool send my data to a server?
- Runs entirely in your browser. Nothing you type is uploaded.
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Need the full version? Everyday Lifestyle goes much deeper on this topic.