Classification of Overweight and Obesity by BMI,
Waist Circumference, and Associated Disease Risks

 
 
 

Disease Risk* Relative to Normal Weight and Waist Circumference


 
BMI
(kg/m2)
Obesity
Class
Men 40 in or less
Women 35 in or less
Men > 40 in
Women > 35 in
Underweight
< 18.5

 
-
-
Normal
18.5 - 24.9

 
-
-
Overweight
25.0 - 29.9

 
Increased
High
Obesity
30.0 - 34.9
I
High
Very High

 
35.0 - 39.9
II
Very High
Very High
Extreme Obesity
40.0 +
III
Extremely High
Extremely High

* Disease risk for type 2 diabetes, hypertension, and CVD.
+ Increased waist circumference can also be a marker for increased risk in persons of normal weight.