Average Height for a 18 Year Old Boy (CDC Data)

Average Height for a 18 Year Old Boy

Pediatricians use CDC growth charts to track adolescent growth during puberty. At age 18, the median stature for boys—the 50th percentile—is 176 cm (5'9").

Teenage height varies enormously depending on puberty timing. Two 18-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 18-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 18-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 18 should be discussed with a pediatrician, especially if accompanied by other symptoms or a sudden change in growth rate.

For a 18-year-old boy, the CDC defines a typical range from the 5th percentile (164 cm / 5'5") to the 95th percentile (188 cm / 6'2"). 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 15–18 experience wide variation in growth timing—early, average, and late bloomers can differ by several inches at the same age.

At age 18, most boys are past their peak growth spurt and gaining height more slowly—often 1–5 cm per year. Late-maturing boys may still have their main spurt ahead.

Growth velocity at age 18 is typically about 1–3 cm per year (near adult height). A boy at this age has about 3–5 cm of growth remaining for late bloomers. Individual timing varies widely based on genetics and puberty onset.