Weight for boys at 11 years
At 11 years, the median weight for boys on the CDC 2000 growth charts is 35.9 kg (79 lb 2 oz): half of boys this age weigh less and half more. The middle half of boys, from the 25th to the 75th percentile, falls between 31.8 and 41.2 kg, a spread of 9.34 kg. The outer lines of the chart, the 3rd and 97th percentiles, sit at 26.5 and 56.0 kg.
Since 10 years, the median has risen by 3.96 kg over 1 year. By 12 years it reaches 40.5 kg.
For girls at 11 years the median is 37.2 kg, 1.31 kg more than for boys, 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 boy at 11 years who weighs 39.1 kg is at about the 67th percentile, meaning that out of 100 boys this age, about 67 weigh less.
Percentiles at 11 years
Download CSV (all ages)| Percentile | z-score | Metric | Imperial |
|---|---|---|---|
| 3rd | −1.88 | 26.49 kg | 58 lb 6 oz |
| 5th | −1.64 | 27.39 kg | 60 lb 6 oz |
| 10th | −1.28 | 28.89 kg | 63 lb 11 oz |
| 25th | −0.67 | 31.83 kg | 70 lb 3 oz |
| 50th (median) | 0.00 | 35.89 kg | 79 lb 2 oz |
| 75th | +0.67 | 41.17 kg | 90 lb 12 oz |
| 90th | +1.28 | 47.47 kg | 104 lb 11 oz |
| 95th | +1.64 | 52.28 kg | 115 lb 4 oz |
| 97th | +1.88 | 55.97 kg | 123 lb 6 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).