According to the CDC's National Center for Health Statistics, the average American adult man stands 68.9 inches (5 ft 8.9 in) tall, and the average American adult woman stands 63.5 inches (5 ft 3.5 in) tall. Those figures come from NHANES data collected between August 2021 and August 2023 — the most current nationally representative sample available. (CDC NCHS FastStats)
Average height in the US varies considerably depending on age, sex, and ethnicity. A 10-year-old boy and a 16-year-old boy can both be "normal" while standing nearly a foot apart. The numbers below reflect national medians — meaning half the population falls above, half below.
Here's a condensed overview before we go section by section:
GroupAverage HeightAdult men (20+)68.9 in (5'8.9")Adult women (20+)63.5 in (5'3.5")Boys age 10~54.5 in (4'6.5")Girls age 10~54.3 in (4'6.3")Boys age 16~68.3 in (5'8.3")Girls age 16~63.8 in (5'3.8")
Source: Fryar et al. (2025), NHANES 2021–2023
Newborns average around 19.7 inches at birth. By 12 months, most children have grown to roughly 29–30 inches. By age 2, the average is about 33–35 inches for both boys and girls — with minimal difference between sexes at this stage.
Growth velocity is highest in the first year of life. After that, it slows but stays consistent through the preschool years. The WHO growth standards and CDC charts are both used during well-child visits to track whether an infant's trajectory is consistent — the trend matters more than any single data point.
From ages 3 through the start of puberty, children typically grow about 2–2.5 inches per year. Boys and girls follow similar trajectories through most of elementary school, though girls often begin a growth spurt slightly earlier.
AgeBoys (avg)Girls (avg)4~40.3 in~39.8 in6~45.5 in~45.0 in8~50.4 in~49.9 in10~54.5 in~54.3 in12~58.7 in~59.4 in
Source: Fryar et al. (2025)
Notice that by age 12, girls are often slightly taller than boys on average. That's not a measurement error — it reflects that girls typically enter puberty 1–2 years earlier than boys, giving them a head start on their growth spurt.
Puberty reshapes everything. Boys' peak growth velocity — the fastest rate of height gain — typically occurs around age 13–14, when they can grow 3–4 inches in a single year. Girls hit peak velocity earlier, usually around 11–12, meaning by the mid-teen years their growth is already slowing.
AgeBoys (avg)Girls (avg)13~61.5 in~62.0 in14~64.0 in~62.9 in15~66.0 in~63.4 in16~68.3 in~63.8 in17~69.0 in~64.0 in
Source: Fryar et al. (2025)
Girls typically reach their final adult height by around 15–16. Boys continue growing into their late teens, with most reaching full stature by 17–18. Once growth plates close, height is effectively set.
The gap between average male and female height in the US is about 5.4 inches — men at 68.9 inches, women at 63.5 inches. That difference is driven largely by testosterone: the surge during male puberty triggers a longer and more intense growth phase before the growth plates eventually close. (CDC NCHS FastStats)
Women also experience estrogen-driven growth, but estrogen simultaneously accelerates growth plate fusion — meaning the female growth spurt tends to be both earlier and shorter.
Adult height also varies meaningfully by race and ethnicity, as documented in the NHANES 2021–2023 data. Non-Hispanic White and Black adults tend to be taller on average than Hispanic or Asian American adults — a pattern that reflects a mix of genetic background, socioeconomic factors, and childhood nutrition access.
Genetics account for roughly 80% of final adult height in developed countries, according to a long-cited review in the Journal of Biosocial Science. (Silventoinen, 2003) A 2022 Nature study analyzing 5.4 million individuals identified over 12,000 genetic variants associated with height — the largest genome-wide association study ever conducted on the trait. (Yengo et al., 2022)
What that 80% figure means practically: if both parents are short, the child is likely to be shorter than the population average. But "likely" isn't "guaranteed." Nutrition, health, and environmental factors during childhood determine whether a child reaches their genetic ceiling — or falls short of it.
Nutrition is the most important external factor for linear growth, functioning essentially as a measure of cumulative net intake during childhood. (Perkins et al., 2016) Protein, calcium, and vitamin D are the key players — not exotic supplements, just consistent adequate intake across the growing years.
A 2021 study in Nutrients found that diet quality and nutritional adequacy were directly associated with standardized height-for-age in US children, with soft drinks and high-fat diets linked to lower height-for-age scores. (Kim & Keen, 2021)
The most reliable foods that help you grow taller are the least surprising: lean protein, dairy, leafy greens, eggs. Nothing in a gummy is going to outperform a consistent diet.
Growth hormone doesn't release in a steady drip throughout the day. It pulses — primarily during slow-wave sleep, especially in the first few hours after falling asleep. (Shaw et al., 2023) Disrupted or insufficient sleep directly reduces GH secretion in children, which is a real cost during the growth years.
Most teenagers get nowhere near the 8–10 hours recommended for their age group. That gap is worth closing, not just for height but for everything else sleep governs.
Physical activity supports bone density and healthy development, with weight-bearing exercise showing the strongest effect on peak bone mass in adolescents. (Frontiers in Pediatrics, 2025) The irony of exercises to boost height naturally is that no single sport or movement directly makes you taller — but consistent physical activity creates the conditions under which genetic height potential is most fully expressed.
A percentile isn't a grade. A child at the 25th percentile for height isn't "short" — they're taller than 25% of kids their age and shorter than 75%. What matters to a pediatrician isn't whether a child is at the 50th percentile but whether they're tracking consistently along their own curve.
A child who drops from the 60th to the 25th percentile over two years warrants more attention than a child who has been at the 20th percentile their whole life. Growth charts are tools for spotting unexpected changes in trajectory, not for ranking kids.
The CDC growth charts used in US clinical practice are based on national data collected since the 1960s through NHANES. (Kuczmarski et al., 2002) Most pediatricians use the CDC charts for children over age 2; the WHO charts are often used for infants under 2.
Here's the part most Americans don't know: the US was once the tallest nation on earth. By the mid-20th century, European countries — particularly the Netherlands, Scandinavia, and Germany — had surpassed the US and kept climbing. Dutch men now average over 182.5 cm (about 6 feet), a height most American men don't reach. (NCD-RisC, 2016)
It gets more interesting. A 2025 analysis of 44,322 US adults across 17 NHANES surveys found that Americans born after the early 1980s have been getting shorter — with declines ranging from 0.68 cm in White women to 1.97 cm in Hispanic men across birth cohorts. (Bogin & Komlos, 2025)
The researchers tie this trend to rising income inequality, healthcare gaps, and nutritional quality — the same structural factors that explain why richer countries with stronger social safety nets tend to be taller countries.
