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Classification of degree of obesity by body mass index
| Body mass index (kg/m2) | |
| Normal weight | 18.5-24.9 |
| Overweight grade 1 | 25-26.9 |
| Overweight grade 2 | 27-29.9 |
| Obesity grade 1 | 30-34.9 |
| Obesity grade 2 | 35-39.9 |
| Obesity grade 3 (morbid) | 40-49.9 |
| Obesity grade 4 (extreme) | ≥ 50 |
Adapted from World Health Organization (WHO) 1995, WHO 2000 and WHO 2004.
