The most important parameters to evaluate obesity are the Body Mass Index (BMI) calculated as weight in kilograms divided by height in meters squared (Kg/m2) and Waist Circumference (WC) ( as shown in the following figure):
| BMI Overweight Classification | |
|---|---|
| BMI (kg/m2) | Category |
| < 18.5 | Underweight |
| 18.5–25 | Normal |
| 25–30 | Overweight |
| 30–35 | Obese class I |
| 35-40 | Obese class II |
| ≥ 40 Obese | Class III |