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The BMI weight cutoffs
| BMI, kg/m2 | Classification (description) |
| <18.5 | Underweight (thin) |
| 18.5–24.9 | Normal weight (healthy and acceptable weight) |
| 25.0–29.9 | Overweight (pre-obese) |
| 30.0–34.9 | Class I obesity (mild obesity) |
| 35.0–39.9 | Class II obesity (moderate obesity) |
| ≥40.0 | Class III obesity (severe or morbid obesity) |
