Average Height for a 12-Year-Old Boy
Some 12-year-olds are already an inch or two into their growth spurt. Others are still growing at the pre-puberty rate of about 2 inches a year. If your son is on the slow-growth side, that alone is not a red flag. What matters more is whether his year-over-year trend is holding.
The 50th-percentile height for a 12-year-old boy in the U.S. is 149.1 cm (4' 10.7"). Here is what that number actually means, and where your son fits.
Full percentile table for 12-year-old boys
| Percentile | Feet & inches | Centimeters |
|---|---|---|
| 5th | 4' 6.0" | 137.2 |
| 10th | 4' 7.0" | 139.8 |
| 25th | 4' 8.7" | 144.1 |
| 50th (median) | 4' 10.7" | 149.1 |
| 75th | 5' 0.7" | 154.2 |
| 90th | 5' 2.6" | 158.9 |
| 95th | 5' 3.7" | 161.8 |
Where does your son fall?
Enter his current height. See his percentile against CDC data for 12-year-old boys.
What is inside the spread at age 12
The average (50th percentile) height for a 12-year-old boy in the U.S. is 149.1 cm (4' 10.7"). That means about half of 12-year-old boys are taller than this, and half are shorter. It does not mean anything is wrong with a 12-year-old who is taller or shorter, every percentile from about the 3rd to the 97th falls within the range of typical variation.
Puberty timing is starting to matter here
Age 12 is where puberty timing starts creating dramatic differences. Some 12-year-old boys are already mid-growth-spurt. Others haven't started. Both are normal, and neither predicts final adult height on its own.
Puberty variance is at its peak. An early-developer 12-year-old can be 6 inches taller than a late-developer classmate and both grow into similar adult heights. Family height sets the final ceiling more than the timing does.
Signs worth mentioning at his next visit
Height alone is rarely diagnostic. What pediatricians look for at age 12:
- Height below the 3rd percentile with unexplained family history.
- Sustained downward percentile crossing over 6-12 months.
- Growth velocity below 2 inches per year for a boy in pre-puberty phase.
- No signs of puberty by age 14 is when it becomes a clinical conversation, not 12.
If any of these apply, that is a conversation to bring to his next visit, ideally with 6-12 months of measurements in hand.
Frequently asked questions
Is my 12-year-old short?
4' 8" (142 cm) puts a 12-year-old around the 15th percentile. Often just late puberty timing.
What if my 12-year-old is tall?
5' 4" (163 cm) at age 12 is above the 95th percentile, tall, usually a mix of early puberty and tall parents.
Do boys still grow after 12?
Yes, most 12-year-old boys have 4-5 years of growth ahead. Peak height velocity typically hits between 13 and 15.
How much should a 12-year-old grow in a year?
2 to 2.5 inches per year pre-puberty; 3-4 inches per year during the peak growth spurt.
Height data comes from the CDC 2000 Growth Charts (stature-for-age for boys). This page is parent education, not medical advice or diagnosis. If you have concerns about your 12-year-old's growth, talk to his pediatrician, ideally with 6-12 months of measurements. © 2026 The Growth Path.