Body Mass Index (BMI)

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Body Mass Index (BMI) is an indicator of whether a person is underweight, normal, or overweight, or . It is calculate by dividing the body mass by the of the height of the person.


The Body Mass Index changes with age, especially in but also in adults. For an adult a BMI of over indicates that a person is obese. Values between and 30 indicate that a person is overweight. An ideal weight for a person gives a value between 20 and . The BMI for an underwight person will give a value less than .

The BMI is not always a good indicator. The BMI makes assumptions about distribution of and bone mass.

The categories do not take into account account different proportions of , bone, cartilage, and water mass. Muscular people, athletes and , have high BMI values, but are not fat.


Lance Armstrong was classified as using the BMI formula when he was in the 1993 Tour de France!