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Table 1 Guidelines for the classification of overweight and obese adults using BMI

From: Fuzzy obesity index (MAFOI) for obesity evaluation and bariatric surgery indication

Condition Classification BMI
Overweight OW 25 to 29.9
Obesity class I OI 30 to 34.9
Obesity class II OII 35 to 39.9
Obesity class III (Morbid) OIII ≥40
  1. Clinical guidelines on the identification, evaluation, and treatment of overweight and obesity in adults. Washington, National Institute of Health, 1998. (Modified).