Average Height for a 12 Year Old Boy (CDC Data)

Average Height for a 12 Year Old Boy

Pediatricians use CDC growth charts to track adolescent growth during puberty. At age 12, the median stature for boys—the 50th percentile—is 144 cm (4'9").

Teenage height varies enormously depending on puberty timing. Two 12-year-olds can differ by 6+ inches and both be normal if each is tracking consistently on their own percentile curve.

The table below shows CDC stature-for-age percentiles for 12-year-old boys. Use these alongside your pediatrician's growth charts at annual checkups.

Is My Child's Height Normal?

During adolescence, temporary comparisons to the average can be misleading because puberty timing differs. A 12-year-old boy who has not yet started puberty may be shorter than peers who have—without any underlying problem.

What matters most is growth velocity and percentile tracking over time. A steady pattern along the 15th or 85th percentile is usually normal; crossing multiple percentile lines rapidly may warrant evaluation.

Heights below the 5th or above the 95th percentile at age 12 should be discussed with a pediatrician, especially if accompanied by other symptoms or a sudden change in growth rate.

For a 12-year-old boy, the CDC defines a typical range from the 5th percentile (128 cm / 4'2") to the 95th percentile (160 cm / 5'3"). Heights within this band are generally considered normal for age. Percentiles below the 5th or above the 95th warrant a conversation with your pediatrician—not necessarily a problem, but worth monitoring.

How Much Will They Grow From Here?

Adolescence is when the most dramatic height changes occur. Boys ages 11–14 experience wide variation in growth timing—early, average, and late bloomers can differ by several inches at the same age.

At age 12, many boys are entering or approaching puberty. Growth velocity often accelerates from the steady ~5 cm/year of childhood to 7–10 cm/year during the peak growth spurt (typically ages 13–15).

Growth velocity at age 12 is typically about 7–9 cm per year during early puberty. A boy at this age has about 28–32 cm of growth remaining for most boys. Individual timing varies widely based on genetics and puberty onset.