Weight level	BMI (kg/m2)*	Obesity class	Disease risk (relative to normal weight and waist circumference)†
			Men ≤ 40 in	Men > 40 in
			Women ≤ 35 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	III	Extremely high	Extremely high