BMI FOR
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Calculate and read your result

The adult BMI calculator uses height and weight. Select centimetres or feet and inches for height, then kilograms or pounds for weight. Check the units before calculating: entering pounds in the kilogram field produces a different result.

The same adult formula applies to women and men: weight in kilograms divided by height in metres squared. Selecting a guide does not change the calculation. For example, 70 kg and 1.75 m gives a BMI of approximately 22.9.

For adults aged 20 and older, the CDC categories are underweight below 18.5, healthy weight from 18.5 to less than 25, overweight from 25 to less than 30, and obesity at 30 or above. A category is a screening reference, not a diagnosis or a personal target.

Context for men

For men who do strength training or have substantial muscle mass, a higher BMI may reflect muscle as well as fat. The calculator cannot distinguish between them, so it cannot tell you whether a change in weight represents muscle gain or body fat.

A result within the healthy weight category also does not establish overall health. BMI does not measure where fat is stored, blood pressure, cholesterol or blood sugar. Those measures can add information that the score does not contain.

When comparing results during training or as you get older, use BMI as a record of height and weight rather than a measure of athletic performance. A clinician can help interpret a result alongside body composition and medical history.

Use the number in context

Check an unexpected result by reviewing the height, weight and selected units. To compare measurements over time, use a consistent measurement method and record the date. A single reading does not explain a longer-term change.

If you want help interpreting your result, bring your measurements and questions to a qualified healthcare professional. They can consider your medical history, physical examination and other health measures before recommending any next steps.

Learn more from the CDC adult BMI categories and CDC explanation of BMI and its limitations. For people under 20, use age- and sex-specific guidance rather than this adult interpretation.

See the BMI guide for women for additional context, or return to the calculator to check your entries.