There are 3 methods of diagnosing and classifying obesity
1. Body Mass Index (kg/m2) BMI = weight (kg)/[height x height (m2)]
| Classification | BMI | Risk of Obesity Complications |
| Underweight | Less than 18 | Low |
| Normal range | 18 to 23 | Normal risk |
| Preobesity | 23 to 27 | Increased risk |
| Grade I obesity | 27 to 35 | High risk |
| Grade II obesity | 35 to 40 | Very high risk |
| Grade III obesity | More than 40 | Extremely high risk |
2. Waist Circumference (measured at umbilicus/belly button)
Male obesity more than 90 cm (36inch)
Female obesity more than 80cm (32inch)
3. Waist to Hip Ratio
Male obesity more than 0.9
Female obesity more than 0.8
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