What's your BMI?
Enter your age, height and weight to see where you fall on the standard scale.
For adults aged 20 and older. Not for pregnancy. BMI is a screening measure, not a diagnosis or a measure of body fat.
Body Mass Index
What the categories mean
- Below 18.5: underweight
- 18.5 to below 25: healthy weight
- 25 to below 30: overweight
- 30 or above: obesity
The category uses your unrounded result; the displayed number is rounded to one decimal place. The chart displays BMI 15–40, with the marker capped at its ends.
How this works
BMI = weight in kilograms ÷ height in metres squared. It does not distinguish muscle from fat or describe fat distribution. A clinician can interpret it alongside other measurements, your background and medical history.
Understand weight and body composition.
Method and sources
General educational estimates, not medical advice. Calculations run in your browser; this calculator does not save or send your entered measurements. Site analytics and advertising may still operate separately. Method and code checked on 27 September 2026; not clinically reviewed.
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