Table 1.

BMI	Classification
< 18.5	Underweight
18.5–24.9	Normal weight
25.0–29.9	Overweight
30.0–34.9	Class I obesity
35.0–39.9	Class II obesity
≥ 40.0	Class III obesity

Body mass index (BMI) is calculated by dividing the subject’s mass by the square of his or her height: BMI = kg/m².