The average American man stands 5 feet 9 inches tall (175.4 cm). This figure comes from the CDC’s National Health and Nutrition Examination Survey, which physically measures thousands of adults rather than relying on self-reported data. At 5’9″, American men fall right in the middle of the global height spectrum, taller than men in most of Asia and Latin America but shorter than those in Northern Europe.
How Height Varies by Age
Men don’t stay the same height throughout adulthood. Younger men in the U.S. tend to be taller than older men, partly because of generational improvements in nutrition and health care, and partly because people lose height as they age. Spinal discs compress and posture changes over the decades, which can shave off an inch or more by your 60s.
National survey data shows a clear pattern across age groups:
- 18 to 24 years: 69.7 inches (5’9.7″)
- 25 to 34 years: 69.6 inches (5’9.6″)
- 35 to 44 years: 69.1 inches (5’9.1″)
- 45 to 54 years: 68.9 inches (5’8.9″)
- 55 to 64 years: 68.3 inches (5’8.3″)
- 65 and over: 67.3 inches (5’7.3″)
That’s a 2.4-inch difference between the youngest and oldest groups. If you’re in your 40s or 50s and feel like you’ve gotten shorter, you probably have, at least slightly.
Where You Fall on the Height Curve
Averages only tell part of the story. Height follows a bell curve, and most men cluster within a few inches of that 5’9″ midpoint. Here’s what the percentile breakdown looks like for American men age 20 and over:
- 5th percentile: 5’4.4″ (shorter than 95% of men)
- 25th percentile: 5’7.2″
- 50th percentile: 5’9.1″ (the true median)
- 75th percentile: 5’11”
- 95th percentile: 6’2″ (taller than 95% of men)
So if you’re 5’11”, you’re taller than roughly three out of four American men. If you’re 6’2″ or above, you’re in the top 5%. And if you’re 5’7″, you’re not unusually short; about a quarter of men are your height or shorter.
How the U.S. Compares Globally
American men aren’t the tallest in the world anymore. The Netherlands holds that distinction, with an average male height of 5’11.5″. Australia, Canada, and Jamaica all average about 5’10”, putting them an inch above the U.S. Meanwhile, men in countries like India (5’5″), the Philippines (5’4″), and East Timor (5’1.5″) are considerably shorter on average.
A century ago, Americans were among the tallest people on the planet. That’s no longer the case. Several European countries have overtaken the U.S. in average height, and CDC data shows that the average American man’s height actually peaked around 2003-2004 at 69.4 inches before dipping slightly to 69.1 inches by 2015-2016. The reasons likely involve the same factors that drive height in general: nutrition quality, childhood health care access, and economic conditions during key growth years.
What Determines How Tall You Get
Genetics is the dominant factor. Scientists estimate that about 80% of your adult height is determined by the DNA you inherited. More than 700 gene variants have been identified that influence height, many of them affecting cartilage in growth plates, the areas in your leg and arm bones where new bone forms during childhood and adolescence.
The remaining 20% comes from environmental factors, and these matter more than most people realize. Nutrition during childhood is the big one. A well-nourished, healthy, active child will generally reach a taller adult height than one with a poor diet or frequent illness. A mother’s nutrition during pregnancy, whether she smoked, and her exposure to hazardous substances all play a role too. Studies on immigrant families have found that children who grow up in countries with better food access and health care often end up significantly taller than their parents, which shows that the gap between populations isn’t purely genetic.
Socioeconomic factors like income, education, and occupation also influence height at a population level. This helps explain why average heights can shift across generations and why they differ between countries with similar genetic backgrounds but different standards of living.
How These Numbers Are Measured
The CDC’s height data comes from actual physical measurements, not surveys where people guess their own height (which tends to add an inch or so, especially for shorter men). Trained examiners measure participants standing barefoot against a wall, with their head positioned so the line from the ear canal to the lower eye socket is parallel to the floor. A carpenter’s square is placed flat on top of the head, and the distance from the floor is measured to the nearest half centimeter. This standardized protocol is why CDC figures are considered more reliable than self-reported data from other surveys.