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body mass index

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(BMI) the weight of a person (in kilograms) divided by the square of the height of that person (in metres): used as an indicator of whether or not a person is over- or underweight. For example, a person who is 1.7 m tall and weighs 65 kg has a BMI of 65/1.72 = 22.5. A BMI of between 20 and 25 is considered normal, between 25 and 30 is overweight, and greater than 30 indicates clinical obesity. A BMI of less than 20 is considered underweight. A limitation of the BMI is that it cannot distinguish whether the weight is due to muscle or fat.

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