Weight for boys at 7 years
At 7 years, the median weight for boys on the CDC 2000 growth charts is 23.1 kg (50 lb 14 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 21.0 and 25.6 kg, a spread of 4.63 kg. The outer lines of the chart, the 3rd and 97th percentiles, sit at 18.2 and 32.3 kg.
Since 6 years, the median has risen by 2.38 kg over 1 year. By 8 years it reaches 25.6 kg.
For girls at 7 years the median is 22.8 kg, 0.31 kg less 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 7 years who weighs 24.6 kg is at about the 66th percentile, meaning that out of 100 boys this age, about 66 weigh less.
Percentiles at 7 years
Download CSV (all ages)| Percentile | z-score | Metric | Imperial |
|---|---|---|---|
| 3rd | −1.88 | 18.18 kg | 40 lb 1 oz |
| 5th | −1.64 | 18.66 kg | 41 lb 2 oz |
| 10th | −1.28 | 19.47 kg | 42 lb 15 oz |
| 25th | −0.67 | 21.01 kg | 46 lb 5 oz |
| 50th (median) | 0.00 | 23.07 kg | 50 lb 14 oz |
| 75th | +0.67 | 25.64 kg | 56 lb 8 oz |
| 90th | +1.28 | 28.58 kg | 63 lb 0 oz |
| 95th | +1.64 | 30.73 kg | 67 lb 12 oz |
| 97th | +1.88 | 32.34 kg | 71 lb 5 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).