BMI Calculator
Check your body mass index in metric or imperial units.
Calculate your BMI (body mass index) online for free. Enter your height and weight to get an instant BMI number, its category — underweight, normal, overweight or obese — and a healthy weight range for your height. Supports metric and imperial units for adults.
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BMI is a rough screening measure, not a diagnosis. Talk to a doctor about what's healthy for you.
Frequently asked questions
How is BMI calculated?
BMI equals weight in kilograms divided by height in meters squared. The calculator does this instantly for metric or imperial inputs.
What does my BMI number mean?
Below 18.5 is underweight, 18.5–24.9 is normal, 25–29.9 is overweight and 30+ is obese. It is a general screening tool, not a medical diagnosis.
Who is BMI for?
Adults. BMI is less meaningful for children and muscular athletes, so a doctor or a body-composition test is better for them.