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 102 cm (40 in) or less
Women 88 cm (35 in) or less
Men > 102 cm (40 in)
Women > 88 cm (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 also can be a marker for increased risk, even in persons of normal weight.
