Classification*	BMI (kg per m2)	Obesity stage	Disease risk (relative to normal weight and waist circumference)†
			Waist circumference Men: ≤ 40 in (≤ 102 cm) Women: ≤; 35 in (≤ 88 cm)	Waist circumference Men: > 40 in Women: > 35 in
Underweight	< 18.5	—	—	—
Normal	18.5 to 24.9	—	—	—
Overweight	25.0 to 29.9	—	Increased	High
Obesity	30.0 to 34.9	I	High	Very high
	35.0 to 39.9	II	Very high	Very high
Extreme obesity	≥ 40.0	III	Extremely high	Extremely high