Meaning (WHO):
 | BMI | Meaning | | less than 19 | Unterweight | | 19 to 25 | Normal weight | | 25 to 30 | Over weight
| | 30 to 35 | Obesity 1 | | 35 to 40 | Obesity 2 | | more than 40 | Obesity 3 |
| Meaning (NRC 1989):
 | Age | BMI Normal weight
| | 19–24 | - 19–24 | | 25–34 | - 20–25 | | 35–44 | - 21–26 | | 45–54 | - 22–27 | | 55–64 | - 23–28 | | Ab 65 | - 24–29 | |