Most teenagers have checked where they stand — literally — against friends, siblings, or that one cousin who seemed to grow six inches over a summer. Height at 17 feels significant. It’s close to the finish line of adolescence, and a lot of teenagers (and their parents) want to know: is this where they’re supposed to be?
The short answer is that “normal” covers a wide range — and a single number tells you far less than a growth pattern over time.
The average height for a 17-year-old boy in the United States is approximately 5 feet 9 inches (175 cm), and for a 17-year-old girl, it’s approximately 5 feet 4 inches (163 cm), according to CDC growth charts. Most teens fall somewhere between the 5th and 95th percentile, which spans several inches in either direction — all considered healthy development.
Key Takeaways
- The CDC places the average height for 17-year-old boys at about 5’9″ and for girls at about 5’4″
- Height percentiles matter more than raw numbers — being at the 20th or 80th percentile is completely normal
- Most girls finish growing by 15–16; boys often continue growing into their late teens or early 20s
- Genetics accounts for roughly 60–80% of final adult height
- If growth has stalled or puberty is significantly delayed, a pediatrician visit is worth scheduling
Average Height for a 17-Year-Old in the United States
Average Height for 17-Year-Old Boys
The median height for a 17-year-old male in the U.S. is 5 feet 9 inches (175.2 cm), based on CDC growth chart data. That’s the 50th percentile — meaning half of 17-year-old boys are taller and half are shorter.
But percentiles tell a richer story than the median alone. A boy at the 10th percentile stands around 5’5″, while one at the 90th percentile is closer to 6’1″. Both are within the healthy range. The spread is nearly 8 inches between those two points — which explains why two classmates the same age can look dramatically different in height without either having a growth problem.
Worth noting: boys at 17 are often still growing. Many don’t hit their full adult height until 18 or 19, and some not until their early 20s. So that number on the chart isn’t necessarily a final answer.
Average Height for 17-Year-Old Girls
The median height for a 17-year-old female is 5 feet 4 inches (162.5 cm), per CDC growth charts. Girls at the 10th percentile average around 5’1″, and those at the 90th percentile reach approximately 5’7″.
The key difference from boys: most girls have finished the bulk of their height growth by age 15 or 16. By 17, many are at or very close to their adult height. A small amount of additional growth (half an inch or so) is still possible, but the dramatic spurts are typically behind them.
| 10th Percentile | 50th Percentile (Average) | 90th Percentile | |
|---|---|---|---|
| 17-Year-Old Boys | ~5’5″ (165 cm) | ~5’9″ (175 cm) | ~6’1″ (185 cm) |
| 17-Year-Old Girls | ~5’1″ (155 cm) | ~5’4″ (163 cm) | ~5’7″ (170 cm) |
What Is Considered a Normal Height for a 17-Year-Old?
Normal is a range, not a number. The CDC growth charts define “normal” as anywhere between the 3rd and 97th percentile for age. That’s a deliberately wide window — intentionally so.
Understanding Growth Percentiles
A percentile ranking tells you how a teen compares to a reference population of same-age, same-sex peers. A 17-year-old boy at the 35th percentile isn’t short — he’s just shorter than 65% of boys his age, and taller than 35%. That’s not a warning sign; it’s a data point.
What actually matters more than any single measurement is the growth trajectory over time. A teen who has consistently tracked along the 25th percentile curve since age 5 is growing normally. A teen who drops from the 60th percentile to the 20th over two years — that shift is worth looking into, even if the height itself seems fine.
Pediatricians use CDC growth charts at every well-child visit for exactly this reason. A one-time measurement can look alarming or reassuring without context. The chart across multiple years shows whether growth is progressing as expected.
Factors That Affect the Average Height for a 17-Year-Old
Genetics
Genetics accounts for an estimated 60–80% of a person’s final height, making it the dominant factor by a wide margin. A rough formula doctors sometimes use: add both parents’ heights together (in inches), add 5 inches for boys or subtract 5 inches for girls, then divide by two. The result is a ballpark “midparental height” — the range within a few inches of that number is where most children land.
That’s not destiny, but it’s a strong pull. Teens with two tall parents tend to be tall. Teens from shorter families usually end up on the shorter side. Genetics sets the ceiling and the floor; everything else works within that range.
Nutrition and Diet
Adequate nutrition doesn’t make a short-statured teen tall — but poor nutrition absolutely can prevent a teen from reaching their genetic potential. The key nutrients for growth during adolescence:
- Protein — supports muscle and tissue development; found in meat, eggs, dairy, legumes
- Calcium — builds bone density; found in dairy, leafy greens, fortified foods
- Vitamin D — supports calcium absorption; found in fatty fish, fortified milk, sunlight exposure
- Zinc — involved in cell growth and repair; found in meat, nuts, seeds
Teenagers who eat a reasonably balanced diet are unlikely to be height-limited by nutrition. The teens most at risk are those with eating disorders, highly restrictive diets, or significant food insecurity.
Physical Activity and Sleep
Exercise during adolescence supports healthy bone density and muscle development, though it doesn’t directly add inches. High-impact activities like basketball, swimming, and running promote overall physical fitness without stunting growth — a concern some parents have that research doesn’t support.
Sleep is more directly tied to height than most people realize. Growth hormone is released primarily during deep (REM) sleep, and teens who consistently get 8–10 hours per night give their bodies the best environment for growth. Chronic sleep deprivation during the growth years is a real, if often overlooked, factor.
Do Most 17-Year-Olds Keep Growing?
Growth Timeline for Boys
Boys typically begin their main growth spurt between ages 12 and 14, and the fastest growth usually happens between 13 and 15. But the growth doesn’t stop there. At 17, many boys are still growing — sometimes by an inch or more per year. Most male growth is complete somewhere between 17 and 21, with the late teens being especially variable.
Growth Timeline for Girls
Girls start their growth spurt earlier — usually between ages 10 and 12 — and most reach close to their adult height by age 15 or 16. By 17, significant additional growth is less common. Some girls gain a small amount (typically under half an inch) after 17, but the major developmental window has passed.
When Growth Plates Close
Growth plates — technically called epiphyseal plates — are areas of soft, growing tissue near the ends of long bones. While these plates remain open, height increases are possible. Once they close (a process called skeletal maturity), no further height growth occurs.
For girls, plates typically close around ages 14–16. For boys, this happens later — often between 17 and 21. A bone age X-ray, ordered by a pediatrician or endocrinologist, can determine whether plates are still open, which is useful when there are questions about growth potential.
How to Measure Height Correctly
Best Time to Measure
Measure in the morning. Height fluctuates throughout the day — people are typically 0.5 to 1 inch taller right after waking than they are in the evening, due to spinal compression from gravity and movement. Morning measurements are more consistent and slightly higher.
Common Measurement Mistakes
- Measuring with shoes on (adds 0.5–1.5 inches depending on footwear)
- Slouching or tilting the head up or down
- Using a flexible tape measure instead of a stadiometer or flat ruler
- Not standing against a flat wall with heels touching the baseboard
For an accurate at-home measurement: stand barefoot with your back against a flat wall, heels together and touching the wall, looking straight ahead. Mark the wall at the top of the head with a pencil, then measure from floor to mark with a rigid measuring tape.
Tracking Growth Over Time
Record height every 3–6 months, noting the date and measurement. Growth of less than 2 inches per year in a teenage boy who hasn’t finished puberty is worth mentioning to a pediatrician. For girls past their main growth spurt, minimal changes are expected and normal.
When Should Parents Be Concerned About Height?
Short Stature
Short stature is clinically defined as a height below the 3rd percentile for age and sex. Being small isn’t automatically a medical problem — a teen with two short parents who is at the 4th percentile is almost certainly just genetically short. The concern arises when height is unexpectedly low relative to family history, or when growth has slowed significantly.
Delayed Puberty
Puberty drives the teen growth spurt. When puberty is significantly delayed — no signs of development by age 14 in boys or age 13 in girls — it can also mean the growth spurt hasn’t happened yet. Delayed puberty has several causes, from constitutional delay (a normal variant where everything just starts later) to hormonal conditions that do require treatment.
When to See a Doctor
Schedule a pediatrician visit if:
- Your teen has grown less than 2 inches in the past year and puberty isn’t complete
- Height has dropped significantly across percentile lines compared to earlier measurements
- There are signs of delayed puberty
- Your teen has symptoms that might suggest an underlying condition (fatigue, unexplained weight changes, digestive issues)
An endocrinologist — a specialist in hormones and growth — can order hormone testing and bone age X-rays if the pediatrician suspects a growth disorder. Most of the time, these evaluations offer reassurance. Occasionally, they catch something treatable.
Frequently Asked Questions About Average Height for a 17-Year-Old
Is 5’7″ Tall for a 17-Year-Old?
For a boy, 5’7″ falls below the 50th percentile (average is 5’9″) — roughly around the 25th–30th percentile. That’s not short; it’s just below the middle of the range. For a girl, 5’7″ is above the 90th percentile, making it quite tall. Context always depends on sex.
Is 6 Feet Tall at 17 Above Average?
Yes. For a 17-year-old boy, 6 feet falls around the 75th–80th percentile — taller than most peers. It’s above average but far from unusual. Boys at 6 feet at 17 often continue growing, sometimes reaching 6’1″ or 6’2″ by adulthood.
Is 5’2″ Normal for a 17-Year-Old Girl?
Completely normal. For a 17-year-old girl, 5’2″ falls around the 25th percentile — shorter than average, but well within the healthy range. As long as growth has followed a consistent curve, there’s nothing concerning about that measurement.
Can Nutrition Increase Height at 17?
If a teen has been nutritionally deficient, correcting that deficiency can help them reach their genetic potential. But supplementing a teen who already eats adequately won’t add inches. Protein, calcium, and vitamin D support healthy bone development, not height beyond what genetics allows.
Jay Lauer is a health researcher with 15+ years specializing in bone development and growth nutrition. He holds a B.S. in Kinesiology and is a certified health coach (ACE). As lead author at HowToGrowTaller.com, Jay has published 300+ evidence-based articles, citing sources from PubMed and NIH. He regularly reviews and updates content to reflect the latest clinical research.