Free tools

Body mass index

One simple number from your height and weight that shows where your weight sits against the healthy range.

Your BMI

What does it measure?

Your weight in kilos divided by your height in metres, squared. The WHO splits it into four bands for adults: under 18.5, 18.5 to 24.9, 25 to 29.9, and 30 or more.

BMI can't tell muscle from fat: someone who lifts can read as overweight without being so. Your waist and a coach complete the picture.

General information, not a diagnosis; if you have a health condition, ask your doctor

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