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Body mass index is a calculation that uses your height and weight to estimate how much body fat you have. Too much body fat is a problem because it can lead to illnesses and other health problems. BMI, although not a perfect method for judging someone's weight.

Category BMI range
Severely underweight less than 16.5
Underweight from 16.5 to 18.4
Normal from 18.5 to 24.9
Overweight from 25 to 29.9
Obese Class I from 30 to 34.9
Obese Class II from 35 to 39.9
Obese Class III over 40