To calculate BMI in children, see the tables below:
| Boys | |||
|---|---|---|---|
| Age | Healthy | Overweight | Obesity |
| 6 | 14.5 | greater than 16.6 | greater than 18.0 |
| 7 | 15 | greater than 17.3 | greater than 19.1 |
| 8 | 15.6 | greater than 16.7 | greater than 20.3 |
| 9 | 16.1 | greater than 18.8 | greater than 21.4 |
| 10 | 16.7 | greater than 19.6 | greater than 22.5 |
| 11 | 17.2 | greater than 20.3 | greater than 23.7 |
| 12 | 17.8 | greater than 21.1 | greater than 24.8 |
| 13 | 18.5 | greater than 21.9 | greater than 25.9 |
| 14 | 19.2 | greater than 22.7 | greater than 26.9 |
| 15 | 19.9 | greater than 23.6 | greater than 27.7 |
| Girls | |||
|---|---|---|---|
| Age | Healthy | Overweight | Obesity |
| 6 | 14.3 | greater than 16.1 | greater than 17.4 |
| 7 | 14.9 | greater than 17.1 | greater than 18.9 |
| 8 | 15.6 | greater than 18.1 | greater than 20.3 |
| 9 | 16.3 | greater than 19.1 | greater than 21.7 |
| 10 | 17 | greater than 20.1 | greater than 23.2 |
| 11 | 17.6 | greater than 21.1 | greater than 24.5 |
| 12 | 18.3 | greater than 22.1 | greater than 25.9 |
| 13 | 18.9 | greater than 23 | greater than 27.7 |
| 14 | 19.3 | greater than 23.8 | greater than 27.9 |
| 15 | 19.6 | greater than 24.2 | greater than 28.8 |