Calculate body mass index using weight and height. The categories apply to adults aged 20 or older and are not suitable for children, adolescents or pregnancy.
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Calculate your BMI
Enter your weight in kilograms and height in centimetres. Calculation takes place in your browser: the tool does not save or send your values.
BMI = weight (kg) / height (m)². The category uses the unrounded value; the result is displayed to two decimal places. BMI does not distinguish muscle from fat and does not diagnose sleep apnoea. Interpretation requires clinical context.
Meaning and limitations
BMI is an approximate indicator: it does not distinguish body fat from muscle and must be interpreted with the clinical history. It is not a diagnostic test for obstructive sleep apnoea.