Body Mass Index (BMI) is a simple index of weight-for-height that is commonly used to classify underweight, overweight and obesity in adults. This formula does not apply on athletes, pregnant, elder and renal failure people.

BMI Range Interpretation
BMI < 15 kg/m 2 Very Severely Underweight
BMI between 15 and 15.9 kg/m 2 Severely Underweight
BMI between 16 and 18.4 kg/m 2 Underweight
BMI between 18.5 and 24.9 kg/m 2 Normal Weight
BMI between 25 and 29.9 kg/m 2 overweight
BMI between 30 and 34.9 kg/m 2 obesity class I, moderate obesity
BMI between 35 and 39.9 kg/m 2 obesity class II , sever obesity
BMI from 40 kg/m 2 and up obesity class III, morbid obesity

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