Quantifying Obesity with Body Mass Index ( Weight/Height2)

BMI (kg/m2)

Classification*

Risk of obesity comorbidity

18.5 – 24.9

Normal range

Negligible

25.0 – 29.9

Overweight

Mildly increased

> 30.0
30.0 – 34.9
35.0 – 39.9
> 40.0

Obese
Class I
Class II
Class III

Moderate
Severe
Very Severe

* Classification of the World Health Organization (WHO) and international Obesity Task Force.