| BMI (kg/m2) | Classification | Risk of obesity co-morbidity |
| 18.5 - 24.9 25.0 - 29.9 >30.0 30.0 - 34.9 35.0 - 39.9 >40.0 | Reference range Overweight Obese Class 1 Class 2 Class 3 | Negligible Mildly increased
Moderate Severe Very severe |