1) Underweight : < 18.5kg/m2

• Mild Thinness - 17kg/m2 - 18.4kg/m2

• Moderate Thinness -  16kg/m2 - 16.9kg/m2

• Severe Thinness - < 16kg/m2

2) Normal Weight : 18.5kg/m2 - 24.9kg/m2

3) Overweight : 25kg/m2 - 29.9kg/m2 

4) Obesity class 1 : 30kg/m2 - 34.9kg/m2 

5) Obesity class 2 : 35kg/m2 - 39.9kg/m2 

6) Obesity class 3 : >/= 40kg/m2  (Morbid obesity)