Classification and Risks of Overweight and Obesity

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 can also be a marker for increased risk even in persons of normal weight.