Health & wellbeing
BMI calculator
Calculate adult body mass index using metric or imperial measurements.
A clear answer. Here’s how.
BMI = weight in kilograms ÷ height in metres squared. Uses CDC categories for adults aged 20 and older: below 18.5, 18.5 to below 25, 25 to below 30, and 30 or above. The category uses the unrounded result. BMI is a screening measure; it does not distinguish muscle from fat or assess health on its own.
See a worked example
Worked example
A fixed demonstration, separate from the values you enter above.
- Weight
- 75
- Weight unit
- Kilograms (kg)
- Height
- 175
- Height unit
- Centimetres (cm)
Example result
- Adult BMI category
- Healthy weight range
- BMI (kg/m²)
- 24.49
Category uses the unrounded BMI. A screening measure for adults aged 20+, not a diagnosis.