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BMI Calculator
Body Mass Index is a quick screening measure for weight categories. Enter your height and weight — in metric or imperial — and get your BMI and category instantly.
How to Use the BMI Calculator
1
Choose Metric or Imperial units.
2
Enter your height and weight.
3
Click Calculate BMI.
4
Read your BMI value and weight category.
Why Use Our BMI Calculator?
- Both unit systems. Centimeters/kilograms or inches/pounds — your choice.
- Instant categories. See where you land: underweight, healthy, overweight or obesity.
- Free and private. No account; your numbers stay in your browser.
- Reference ranges included. Standard WHO cut-offs shown with your result.
BMI Calculator FAQs
A BMI between 18.5 and 24.9 is classified as healthy weight for most adults.
BMI equals weight in kilograms divided by height in meters squared. The tool does the math for both unit systems.
BMI does not distinguish muscle from fat, so very muscular people may score high despite low body fat. Treat it as a screening tool, not a diagnosis.
Children's BMI is interpreted with age-and-sex percentiles, not adult cut-offs. This tool uses adult categories.
Yes — tap Imperial and enter inches and pounds; conversion is automatic.
No. All calculations happen locally in your browser.
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