The Average Height for Teenagers

Every parent has done it — eyeballed their kid at a family gathering and quietly wondered if they’re measuring up. And every teenager has, at some point, stood back-to-back with a friend and done the math. Height during adolescence is one of those topics that feels deeply personal but is also, inconveniently, driven almost entirely by biology.

The short version: the average height for teenagers varies by age and sex, shifts dramatically across the teen years, and says less about any individual kid than most people think.

Key Takeaways

• The average 13-year-old boy stands around 5’1″–5’2″; by 18, the median climbs to about 5’9″
• Girls typically reach average heights of 5’3″–5’4″ by their mid-teens and grow very little after that
• Genetics account for roughly 80% of final adult height — nutrition, sleep, and exercise influence the remaining window (Silventoinen, 2003)
• Pediatricians track growth trajectories, not snapshots — a consistent curve matters more than a single number
• Late bloomers are real; a teenager who’s short at 15 may still hit their genetic ceiling by 18 or 19

What Is the Average Height for Teenagers?

Average height for teenagers is the median height — the midpoint — within a given age group, split by biological sex. These figures come from nationally representative surveys, primarily the CDC’s NHANES program, and are published as growth charts used in pediatric care across the US.

The averages shift noticeably from year to year during adolescence, which is exactly why a single number doesn’t tell you much on its own.

Average Height for Teenage Boys by Age

Boys tend to hit their main growth spurt between 12 and 15, with peak growth velocity typically around age 13–14. After that, growth slows significantly — but doesn’t stop cold.

Here’s what the data shows, drawn from CDC growth charts and the most recent NHANES anthropometric data (Fryar et al., 2025):

Most boys add 3–4 inches during their peak year. The range across the 5th to 95th percentile is wide — nearly a foot — which is a useful reminder that “average” covers a lot of ground.

Average Height for Teenage Girls by Age

Girls start puberty earlier, so their growth spurt hits sooner — typically between 10 and 13. By the time most boys are hitting their peak growth year, many girls are already slowing down.

Girls often reach close to their adult height by 14–15. Growth after that point is usually under an inch. The plateau isn’t dramatic — it just quietly happens while boys are still catching up.

How Teenagers Grow During Puberty

Growth during adolescence isn’t steady. It’s driven by hormonal changes that trigger a concentrated period of rapid bone elongation — and then, eventually, shut that window permanently.

When Growth Spurts Usually Begin

For girls, the growth spurt typically starts between 8 and 13 and peaks around age 11–12. For boys, it starts later — usually 10 to 14 — with peak velocity around 13–14.

The pituitary gland ramps up production of growth hormone, which in turn stimulates IGF-1 (insulin-like growth factor 1) in the liver. Sex hormones — estrogen in girls, testosterone in boys — accelerate the process and, eventually, signal the growth plates to close. The irony: the same hormones driving the spurt are also counting it down.

Not every teenager follows this schedule. Early and late bloomers exist on both ends, and there’s nothing medically wrong with being either one.

When Most Teenagers Stop Growing

When do boys stop growing? Most reach their final height between 17 and 20. When do girls stop growing? Usually between 14 and 16, though minor gains can continue to 18.

The mechanism is straightforward: growth plates (epiphyseal plates) — the cartilage-rich zones near the ends of long bones where new bone tissue is produced — gradually harden and fuse. Once fused, they can’t generate new length. A bone age X-ray can show how much growth potential remains; it’s more informative than chronological age alone.

This connects directly to a question worth addressing honestly: if a teenager is short, the timing of puberty matters more than the absolute number at any given age.

Factors That Affect the Average Height for Teenagers

Three categories do most of the work. The first one dominates.

Genetics and Family History

Genetics explain roughly 60–80% of the variation in final adult height (Silventoinen, 2003). A 2022 Nature study mapping over 12,000 genetic variants found that common SNPs alone explain about 40% of height variation in people of European ancestry — and that’s not counting rarer variants (Yengo et al., 2022).

The mid-parental height formula — average the parents’ heights, add 2.5 inches for boys or subtract 2.5 inches for girls — gives a rough target range. It’s imprecise, but it’s not useless. Short parents can still have tall children depending on which genetic variants get passed along.

The honest framing: genetics set the ceiling. Everything else determines whether a teenager gets close to it.

Nutrition, Sleep, and Physical Activity

Nutrition is the most important external factor for linear growth (Perkins et al., 2016). Protein and height growth are closely linked — adequate protein intake supports the bone and muscle development that puberty demands. Calcium and vitamins for height growth — particularly vitamin D — directly support bone mineralization.

Sleep is where growth hormone does most of its work. The pituitary gland releases GH in pulses during slow-wave sleep — not a trickle throughout the day (Shaw et al., 2023). Disrupting that window consistently, night after night, adds up. Most US teenagers don’t get anywhere near the 8–10 hours recommended for their age group.

Physical activity matters for bone density more than raw height, but does weight training stunt growth? The evidence says no — supervised strength training doesn’t damage growth plates in healthy adolescents. The concern is real but mostly misapplied to recreational training with proper coaching.

Medical Conditions That Can Affect Growth

Some teenagers fall significantly below their expected height trajectory because of an underlying medical issue, not just genetics. Growth hormone deficiency, hypothyroidism, celiac disease (which impairs nutrient absorption), and chronic inflammatory conditions can all suppress growth. Delayed puberty — whether from stress, low body weight, or constitutional delay — is another common pattern.

The distinguishing feature isn’t where a teenager sits on the chart at one point in time. It’s whether their growth curve has flattened or slowed relative to their own previous trajectory. A pediatric endocrinologist can assess bone age, hormone levels, and family history to determine whether any intervention is warranted.

How Doctors Measure Healthy Growth

Height alone, at a single visit, tells a pediatrician very little. What matters is the pattern over time.

Understanding Growth Charts

CDC growth charts plot height-for-age percentiles — a curve that shows where a child falls relative to peers of the same age and sex. A teenager at the 20th percentile isn’t “short” in any clinical sense; they’re right where they’ve always been.

What raises a flag is crossing percentile lines significantly — dropping from the 50th to the 10th over a year or two, or failing to gain height when expected. That pattern warrants a closer look. The number on the wall does not.

When to See a Pediatrician

Annual physicals are the simplest way to keep a running record. If growth has stalled noticeably, if puberty hasn’t started by age 14 in boys or 13 in girls, or if a teenager is tracking far below both parents’ heights, a conversation with the pediatrician is reasonable.

Bone age testing (a simple wrist X-ray) and basic bloodwork can rule out most medical causes quickly. Most short teenagers don’t have a diagnosable condition — but it’s worth checking rather than waiting and wondering.

Common Myths About Teen Height

There’s an entire industry built on parents’ and teenagers’ anxiety about height. Most of it deserves a raised eyebrow.

Can Stretching Make You Taller?

Does stretching make you taller? Not in any permanent sense. Stretching improves posture, which can make a person appear taller — sometimes by an inch or more — but it doesn’t lengthen bone. Once growth plates fuse, that’s the architecture. Yoga and stretching routines have real benefits, just not this one.

Do Supplements Increase Height?

Height growth gummies for kids and similar products typically contain vitamins and minerals — things a balanced diet already provides. If a teenager is genuinely deficient in vitamin D or calcium, correcting that deficiency supports normal growth. The supplement itself isn’t adding height; it’s removing a potential drag. The marketing rarely makes that distinction.

Does Basketball Make You Taller?

Does basketball make you taller? The causality here runs backwards. Tall kids are recruited into basketball, not the other way around. The sport correlates with height because height is an advantage — not because jumping and running trigger bone growth. That said, any weight-bearing sport supports healthy bone development during adolescence, which is a real benefit.

Tips to Support Healthy Growth During the Teen Years

What actually moves the needle is less exotic than supplement labels suggest.

Build a Balanced Diet

Prioritize protein — lean meats, eggs, legumes, dairy — and don’t skip calcium. Foods that help you grow taller aren’t a special category; they’re the foods most nutrition guidelines already recommend. Milk specifically has been associated with better height outcomes in girls (Wiley, 2005), largely through its protein and calcium content.

Prioritize Quality Sleep

This is the most underrated one. Aiming for 8–10 hours isn’t just general health advice — it’s directly relevant to growth hormone release. Teenagers who consistently sleep 6 hours are compressing the primary GH secretion window night after night. That gap is worth closing more than most.

Stay Physically Active

Exercises to boost height naturally won’t override genetics, but regular physical activity — especially weight-bearing exercise — supports bone density and overall development. Does swimming increase height? Not directly, but it builds a strong physical foundation and is low-injury. The best sports to boost height are largely the ones a teenager will actually stick with.

Keep Up With Annual Checkups

The growth chart only works if someone’s keeping it. Annual well-child visits track height consistently over time — which is the only way to catch a flattening curve early.

Orianna Lux, MS, RDN Medically Reviewed by Expert

Registered Dietitian Nutritionist | Pediatric Growth & Nutrition Specialist

Orianna is a Registered Dietitian Nutritionist with a Master's degree in Human Nutrition and over 8 years of clinical experience specializing in pediatric growth, childhood nutrition, and height development.

MS in Human Nutrition Registered Dietitian Nutritionist (RDN) Pediatric Nutrition Specialist 8+ Years Clinical Experience Evidence-Based Practice

Last updated: July 15, 2026