BODY MASS INDEX

April 7, 2015

The body mass index (BMI) is a measure of relative size based on the mass and height of an individual. The BMI for a person is defined as their body mass divided by the square of their height—with the value universally being given in units of kg/m2

A frequent use of the BMI is to assess how much an individual’s body weight departs from what is normal or desirable for a person of his or her height. The weight excess or deficiency may, in part, be accounted for by body fat (adipose tissue) although other factors such as muscularity also affect BMI significantly.

CategoryBMI range – kg/m2BMI Prime
Very severely underweightless than 15less than 0.60
Severely underweightfrom 15.0 to 16.0from 0.60 to 0.64
Underweightfrom 16.0 to 18.5from 0.64 to 0.74
Normal (healthy weight)from 18.5 to 25from 0.74 to 1.0
Overweightfrom 25 to 30from 1.0 to 1.2
Obese Class I (Moderately obese)from 30 to 35from 1.2 to 1.4
Obese Class II (Severely obese)from 35 to 40from 1.4 to 1.6
Obese Class III (Very severely obese)over 40over 1.6
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