Weight for girls at 9 years
At 9 years, the median weight for girls on the CDC 2000 growth charts is 29.0 kg (63 lb 15 oz): half of girls this age weigh less and half more. The middle half of girls, from the 25th to the 75th percentile, falls between 25.8 and 33.1 kg, a spread of 7.33 kg. The outer lines of the chart, the 3rd and 97th percentiles, sit at 21.5 and 44.3 kg.
Since 8 years, the median has risen by 3.36 kg over 1 year. By 10 years it reaches 32.9 kg.
For boys at 9 years the median is 28.6 kg, 0.44 kg less than for girls, which is why the charts are drawn separately by sex.
From 2 years CDC recommends its own 2000 growth charts, which draw the 3rd to the 97th percentile; under 2, the WHO charts draw the 2nd to the 98th.
Reading the table: a girl at 9 years who weighs 31.5 kg is at about the 67th percentile, meaning that out of 100 girls this age, about 67 weigh less.
Percentiles at 9 years
Download CSV (all ages)| Percentile | z-score | Metric | Imperial |
|---|---|---|---|
| 3rd | −1.88 | 21.50 kg | 47 lb 6 oz |
| 5th | −1.64 | 22.22 kg | 49 lb 0 oz |
| 10th | −1.28 | 23.43 kg | 51 lb 11 oz |
| 25th | −0.67 | 25.78 kg | 56 lb 13 oz |
| 50th (median) | 0.00 | 28.99 kg | 63 lb 15 oz |
| 75th | +0.67 | 33.11 kg | 73 lb 0 oz |
| 90th | +1.28 | 37.95 kg | 83 lb 10 oz |
| 95th | +1.64 | 41.57 kg | 91 lb 10 oz |
| 97th | +1.88 | 44.31 kg | 97 lb 11 oz |
CDC 2000 charts draw the 3rd to the 97th percentile. Values computed with the LMS method from the published tables (retrieved 2026-10-05).