Average height
Average Height for a 8-Year-Old Boy
By the Taller team · Updated · 4 min read · How we write
The average height for a 8-year-old boy in the US is about 4'3.5" (131 cm), the 50th percentile on the CDC growth charts (measured halfway through the year, at 8½). Most 8-year-old boys are between 3'11.5" and 4'7.5" tall (5th to 95th percentile).
Height percentiles for 8-year-old boys
A percentile tells you how many boys of the same age are shorter: at the 75th percentile, a boy is taller than 75 out of 100 boys 8 years old.
| Percentile | At 8 | At 8½ |
|---|---|---|
| 5th | 3'10.5" (119 cm) | 3'11.5" (121 cm) |
| 10th | 3'11.5" (121 cm) | 4'0.5" (123 cm) |
| 25th | 4'1" (124 cm) | 4'2" (127 cm) |
| 50th (median) | 4'2.5" (128 cm) | 4'3.5" (131 cm) |
| 75th | 4'4" (132 cm) | 4'5" (135 cm) |
| 90th | 4'5.5" (135 cm) | 4'6.5" (139 cm) |
| 95th | 4'6" (138 cm) | 4'7.5" (141 cm) |
How much will a 8-year-old boy grow?
At the median, boys grow about 2.2 in (5.6 cm) between 8 and 9. A boy of average height at 8 has reached about 72% of adult height and still has around 19.3 in (49 cm) to go.
Most 8-year-old boys have not started puberty yet and grow at a steady pace of about 2 inches (5 cm) a year.
Check a height
Enter a height to see its exact percentile for boys aged 8.
Is my son’s height normal?
Any height between roughly the 3rd and 97th percentile is common. What matters more is the trend: a child who stays on the same percentile line over the years is usually growing normally. Talk to a doctor if your child is below the 3rd percentile, much shorter than the parents’ heights suggest, has stopped growing, or has crossed two major percentile lines downward. See the height percentile calculator.
Average height for boys by age
| Age | Median height | Normal range (5th–95th) |
|---|---|---|
| 8 years | 4'3.5" (131 cm) | 3'11.5" – 4'7.5" |
| 9 years | 4'5.5" (136 cm) | 4'1.5" – 4'10" |
| 10 years | 4'7.5" (141 cm) | 4'3" – 5'0" |
| 11 years | 4'9.5" (146 cm) | 4'5" – 5'2.5" |
| 12 years | 5'0" (152 cm) | 4'7" – 5'5" |
| 13 years | 5'3" (160 cm) | 4'10" – 5'8" |
| 14 years | 5'6" (167 cm) | 5'0.5" – 5'11" |
| 15 years | 5'7.5" (172 cm) | 5'2.5" – 6'0.5" |
| 16 years | 5'8.5" (175 cm) | 5'4" – 6'1.5" |
| 17 years | 5'9" (176 cm) | 5'4.5" – 6'2" |
| 18 years | 5'9.5" (176 cm) | 5'5" – 6'2" |
Frequently asked questions
Is 4'5" tall for a 8-year-old boy?
Yes. 4'5" is about the 74th percentile for boys aged 8, so taller than roughly 74 out of 100. Being tall at 8 can also mean an early growth spurt, so it doesn’t guarantee being tall as an adult.
Is 4'2" short for a 8-year-old boy?
4'2" is about the 26th percentile for boys aged 8: below average but well within the normal range. Many boys who are shorter at 8 simply start puberty later and catch up.
How much will a 8-year-old boy grow?
At the median, boys grow about 2.2 in (5.6 cm) between 8 and 9, and about 19.3 in (49 cm) in total before adulthood. The real number depends on genetics and puberty timing.
How tall will a 8-year-old boy be as an adult?
A boy of median height at 8 is on track for about 5'9.5" (177 cm). For a personal estimate that also uses the parents’ heights, use the height calculator.
Sources
- Clinical Growth Charts (2000 CDC stature-for-age) — CDC / National Center for Health Statistics
- Data Table of Stature-for-age Charts (LMS parameters) — CDC
- Puberty — Nemours KidsHealth
Keep reading
This page is for general education and is not medical advice. Growth is very individual: if you are worried about your height, growth or puberty, talk to a doctor or a pediatric endocrinologist.