The Average Height of Men and Women Over Time

Americans are taller than their great-grandparents. Not by a little — by several inches. That gap is one of the clearest signals that human height is shaped by far more than the genes parents pass down. Environment does the rest, and the environment changed dramatically over the 20th century.

The average American man today stands around 5 feet 9 inches (175 cm). The average American woman stands around 5 feet 4 inches (162 cm). Both figures come from measured data in the National Health and Nutrition Examination Survey (NHANES), collected by the CDC and the National Center for Health Statistics. These are not self-reported estimates — they are tape-measure numbers from a nationally representative sample.

Key Takeaways

• The average American man is approximately 5’9″ (175 cm); the average American woman is approximately 5’4″ (162 cm), based on CDC/NHANES measured data.
• Average height in the U.S. rose substantially across the 20th century, driven by better nutrition, lower childhood disease burden, and improved living standards.
• Height gains have slowed significantly in high-income countries since the 1980s, suggesting populations are approaching their genetic potential under current conditions.
• Men remain taller than women on average primarily due to hormonal differences during puberty that extend the male growth period.
• Height is a population statistic. It describes a group average, not a target or a measure of individual health.

What Is the Average Height of Men and Women Today?

The modern baseline for adult height in the United States comes from NHANES data collected by the CDC’s National Center for Health Statistics. Because heights are measured by trained technicians rather than self-reported, these numbers are more reliable than most international comparisons, which often rely on self-reported surveys.

Mean height varies by age group, race, and ethnicity within the U.S. population. The figures most commonly cited reflect adults aged 20 and older. Both male and female averages are noticeably higher than comparable cohorts from a century ago.

Average Height of American Men

The average American man aged 20 and older stands approximately 5 feet 9.2 inches (175.4 cm). That figure is drawn from NHANES measurement cycles and has held roughly stable for the past two decades — a marked contrast to the rapid gains recorded in earlier birth cohorts.

Age matters here. Men typically reach full adult stature in their late teens to early twenties. After age 40, the spine gradually compresses and mean measured height begins to decline slightly. So a population sample that skews older will return a marginally lower mean than one restricted to adults aged 20–39.

Average Height of American Women

The average American woman aged 20 and older stands approximately 5 feet 3.7 inches (161.8 cm). The gap between male and female averages — roughly 5.5 inches (14 cm) — has remained consistent across modern measurement cycles, though the absolute values for both have risen compared to earlier generations.

That gap is not universal across all populations worldwide. In some Northern European countries, the male-female height difference is slightly smaller. But the U.S. figures are internally consistent and reflect a measured rather than an estimated population.

How Has the Average Height of Men Changed Over Time?

American men born in the mid-1800s were, on average, around 5 feet 7 inches (170 cm). By the mid-20th century, that figure had climbed toward 5 feet 9 inches. The gains were not gradual and linear — they tracked closely with improvements in childhood nutrition, sanitation, and disease control.

Military conscription records and anthropometric surveys from the Civil War era give researchers a surprisingly detailed picture of 19th-century stature. Heights were already beginning to rise during industrialization, dipped slightly during the early 20th century (a period of rapid urbanization and crowded conditions), then rose sharply after World War II as nutrition and public health infrastructure improved.

Data from the NCD Risk Factor Collaboration (NCD-RisC), which analyzed height trends across 200 countries using birth cohort methodology, found that men born in North America in 1896 averaged around 5 feet 7 inches. Men born in 1996 average roughly 2 inches taller. That’s a meaningful shift — but a much smaller one than some regions experienced. South Korean men, for example, gained more than 3 inches over the same period.

Figures are approximate and drawn from historical records and NCD-RisC birth cohort estimates.

How Has the Average Height of Women Changed Over Time?

American women followed a similar trajectory, though historical data is thinner. Women were less frequently included in military or occupational measurement records, so researchers rely more heavily on birth-certificate-linked health surveys and 20th-century anthropometric studies.

Women born in the late 1800s averaged around 5 feet 2 inches (157 cm). By the late 20th century, that figure had risen to approximately 5 feet 4 inches. The gains parallel those seen in men — driven by the same environmental improvements — but the absolute increase was slightly smaller in the U.S. context.

Globally, the female height story is more dramatic in certain regions. According to NCD-RisC data analyzed by Our World in Data, South Korean women born in 1996 averaged about 3 inches taller than women born in the same country in 1896. American women gained less than 2 inches across the same 100-year window — a sign that U.S. living standards were already relatively high at the starting point.

Why Have Men and Women Become Taller?

Genetics sets the range; environment determines where within that range a person lands. Most researchers estimate that roughly 60–80% of height variation between individuals is explained by genetics. But population-level increases over a century cannot be genetic — human DNA doesn’t shift that fast. The gains reflect environmental change.

The biggest drivers:

• Nutrition: Adequate protein, calcium, and micronutrients during childhood and adolescence are directly linked to skeletal growth. Best vitamins for height growth, particularly vitamin D and calcium, play a documented role in whether children reach their genetic height potential.
• Lower disease burden: Childhood infections divert energy away from growth. As sanitation improved and vaccines became standard, fewer calories were lost fighting illness.
• Maternal and prenatal health: Better prenatal nutrition and reduced maternal illness contributed to gains across birth cohorts.
• Healthcare access: Earlier detection and treatment of conditions that impair growth — including rickets, thyroid disorders, and malnutrition — meant fewer children grew up with avoidable deficits.

None of these factors is surprising on its own. But together, across an entire population, across decades, they compound into measurable inches.

Why Are Men Taller Than Women on Average?

Men are taller than women primarily because of how puberty unfolds differently across biological sexes. Boys typically experience their adolescent growth spurt later than girls — and when it comes, it lasts longer. The extended growth window, driven largely by testosterone, allows male growth plates to remain open for additional bone elongation before they close.

Girls, on average, begin puberty earlier and complete skeletal growth sooner. Estrogen accelerates growth plate fusion, which is why girls often appear taller than boys of the same age in early adolescence — and then boys catch up and surpass them by their late teens.

The result is a consistent population-level difference. But “population-level” is doing a lot of work in that sentence. Height distributions for men and women overlap substantially. A tall woman and a short man is not an anomaly — it’s a completely ordinary expression of normal variation within both groups.

Has Average Human Height Stopped Increasing?

In the United States and most other high-income countries, yes — height gains have essentially plateaued. The large increases observed across 20th-century birth cohorts have slowed to the point of statistical noise in recent decades.

The Netherlands offers the clearest illustration. Dutch men became among the tallest in the world across the 20th century, gaining dramatically across successive birth cohorts. But Dutch height has been essentially flat since the 1980s. Something similar has happened in the U.S., the U.K., and much of Western Europe.

One interpretation, supported by NCD-RisC researchers: these populations have largely eliminated the environmental factors that were suppressing height below genetic potential. Further gains would require different genetics — not better conditions. The low-hanging fruit is gone.

Countries where childhood nutrition and healthcare are still improving continue to see gains. But for Americans, the number on the tape measure has been stable for a generation.

What Height Trends Tell Us About Health and Living Standards

Economists and historians use average height as what they call a “biological standard of living” — a physical record of how well a population was fed and how healthy its childhood environment was. It’s imperfect, but it captures something GDP alone doesn’t.

The height gains of the 20th century weren’t inevitable. They required specific changes: cleaner water, childhood vaccination, school nutrition programs, reduced food insecurity, better maternal care. Where those changes didn’t happen — or happened later — height gains lagged.

That doesn’t mean taller is inherently better, or that individual height is a direct health marker. It means population height trends are a useful signal about whether children are getting what they need to grow. When a country’s average height stagnates or declines, it’s worth asking why.

For American parents today, the practical implication is narrower: the average figures from NHANES represent what healthy childhood conditions in the U.S. currently produce. Individual children will vary — sometimes significantly — based on their own genetics and circumstances.

The Bottom Line

The average American man stands about 5’9″ and the average American woman about 5’4″, based on measured CDC data. Both are taller than previous generations, largely because nutrition, sanitation, and childhood healthcare improved substantially across the 20th century. Height gains have now plateaued in the U.S. and most other high-income countries — which is itself evidence that environmental conditions here have largely stopped being the limiting factor.

FAQ

How tall is the average American man? About 5 feet 9 inches (175 cm), based on measured NHANES data from the CDC. This figure has been stable for roughly 20 years.

How tall is the average American woman? About 5 feet 4 inches (162 cm) by the same measurement methodology. The male-female gap of around 5.5 inches has been consistent across modern surveys.

Were people shorter in the past? Yes. Americans in the mid-1800s averaged around 5’7″ for men and 5’2″ for women. Gains over the following century were driven by better nutrition, sanitation, and healthcare — not genetic change.

Why did average height increase so much in the 20th century? Primarily because childhood conditions improved. Better food quality and quantity, lower rates of infectious disease, and cleaner water allowed more children to reach their genetic height potential rather than fall short of it.

Has human height stopped increasing? In the U.S. and most high-income countries, yes. Average heights have plateaued since roughly the 1980s. Countries where childhood nutrition and health infrastructure are still improving continue to see gains.

Why are men taller than women on average? Boys experience a later and longer growth spurt than girls during puberty. Testosterone supports extended skeletal growth, while estrogen accelerates growth plate closure. The result is a consistent — though not universal — height difference between the sexes.

Does average height predict individual health? No. Height is a population statistic useful for tracking public health trends. It doesn’t tell you much about any individual’s health status.

Which country has the tallest average height? The Netherlands consistently ranks near the top for men. Dutch men average approximately 6 feet (182 cm). For women, Latvia and the Netherlands regularly appear at the high end of international comparisons