BMI Calculator
Check your body mass index in seconds. Enter height and weight in metric or imperial units — the BMI and weight category appear instantly.
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How to Use the BMI Calculator
- Enter your height and choose the unit.
- Enter your weight and choose the unit.
- Read your BMI and the weight category.
BMI Categories (Adults)
- Underweight: below 18.5
- Healthy: 18.5 – 24.9
- Overweight: 25 – 29.9
- Obesity: 30 and above
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Frequently Asked Questions
How is BMI calculated?
BMI is weight in kilograms divided by height in meters squared. The calculator converts imperial units for you automatically.
What is a healthy BMI?
For most adults, 18.5 to 24.9 is considered the healthy range by the WHO and CDC.
Is BMI accurate for athletes?
Not always — BMI cannot tell muscle from fat, so very muscular people can score as “overweight” while being lean. Treat it as a screening tool, not a diagnosis.
Does BMI work the same for children?
No. Children’s BMI is interpreted against age- and sex-specific percentiles. This calculator uses adult categories.
Is my data sent anywhere?
No. The calculation runs entirely in your browser — your height and weight never leave your device.