Track your progress · Free calculator
Adult BMI calculator
Calculate body mass index from height and weight, with adult screening categories and metric or US units.
Free to use. No account required.
Example values are prefilled. Replace them with your own values to calculate your result.
Body mass index
Adult screening category
BMI is shown to two decimal places. The category uses the unrounded value, so rounding near a boundary does not change it.
Keep this calculation in this tab for up to two hours, then sign in to review it during setup. Nothing is added to your account until you save.
Adult BMI category ranges
- Underweight
- Below 18.5
- Healthy weight
- 18.5 to below 25
- Overweight
- 25 to below 30
- Obesity, class 1
- 30 to below 35
- Obesity, class 2
- 35 to below 40
- Obesity, class 3
- 40 and above
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