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KidsHealth /
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Is My Penis Normal?

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I Have Bumps On My Penis. Is This Normal?

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/content/kidshealth/misc/medicalcodes/teens/articles/penis

Just about every guy wonders how he measures up "down-there." Here's the lowdown for any guy who's ever worried about whether his penis is a normal size.
There is a wide range of normal penis sizes. Although you may see guys with penises that are bigger or smaller than yours, it is very likely that your penis is a normal size. Penis size is determined by your genes
, just like eye color or foot size. And there's a lot less difference in penis size between guys when they get an erection than when their penises are relaxed.
Despite what you may hear or read, no special exercises, supplements, or diets will change a guy's penis size.
The penis grows the most during puberty . Some boys start puberty around 9 and others don't start until they are 15. Usually by the end of puberty, a guy's penis has reached its expected size. Puberty usually ends about 4 years after it starts, so this is usually around age 13–19.
In addition to size, guys also wonder about how their penis looks. For example, a guy might wonder if the skin covering the penis is normal or if it's OK for a guy's penis to hang to the left or right (it is!).
If you're concerned about how your penis looks, ask your doctor. Teen guys should have testicular exams every year at their regular checkup. So that's a good time to ask your doctor any questions.
Note: All information on KidsHealth® is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor.
© 1995-2022 The Nemours Foundation. Nemours Children's Health®, KidsHealth® and TeensHealth® are registered trademarks of The Nemours Foundation. All rights reserved.
Images provided by The Nemours Foundation, iStock, Getty Images, Veer, Shutterstock, and Clipart.com.

At What Age Does Penis Growth Start and End?

Verywell Health's content is for informational and educational purposes only. Our website is not intended to be a substitute for professional medical advice, diagnosis, or treatment.

Ⓒ 2022 Dotdash Media, Inc. — All rights reserved

Verywell Health articles are reviewed by board-certified physicians and healthcare professionals. These medical reviewers confirm the content is thorough and accurate, reflecting the latest evidence-based research. Content is reviewed before publication and upon substantial updates. Learn more .

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When do males start getting pubic hair?

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Jerry Kennard, PhD, is a psychologist and associate fellow of the British Psychological Society.
Jamin Brahmbhatt, MD, is board-certified in urology. He is an assistant professor at UCF College of Medicine and chief of surgery at Orlando Health South Lake Hospital.

Penis growth does not have one set age limit. However, the growth of the penis is influenced by the hormones of puberty. A person's penis will start to grow more rapidly between ages 10 and 14 but can keep growing until they are between the ages 16 and 21. 1

Many young people feel concerned or self-conscious about their penis size during adolescence, but most will reach their full penis size by their late teens.

This article discusses when most penis growth occurs, what penis size is considered "normal," and how penis size is measured. It also debunks several myths about penis size.

Many physical changes in the body take place when a biologically male person starts to go through puberty —for example, they will get taller and more muscular.

A young person may also notice that their penis starts to get erect when they are sexually aroused, when they are asleep , and even at other seemingly random times. The testicles will also get larger and pubic hair will grow.

Most penis growth occurs between the ages of 12 and 16. The penis grows in length first and then grows in width (referred to as girth).

Most people reach their fully developed penis size between the ages of 18 and 21.

If you are a young person going through puberty, you may notice that your penis size changes suddenly and fast. Your body, including your penis, may experience rapid changes for a few weeks, and then stay the same for months before changes start happening again. 1

Just like there isn't one age that's the limit for penis growth there's also no single penis size that's normal for everyone.

The average erect penis measures a little over 5 inches long and 4.5 inches around. 2

Your penis may keep growing for one or two years after you stop growing in height, or for four to six years after your testicles enlarge. However, know that starting puberty later or earlier is not in any way related to the size your penis will eventually be.

If you're measuring your penis, remember that a flaccid penis is smaller than an erect one.

Young people may hear many myths about penis size or share them among friends. These misunderstandings and falsehoods can make people worry about their penis size unnecessarily.

A young adult's penis grows most rapidly during puberty, especially between the ages of 12 to 16. Some young people experience "growth spurts," when physical changes in their height, muscles, penis size, and pubic hair come on suddenly and move fast.

If you're worried about the size of your penis and think you've passed the age limit for penis growth, know that while people generally reach their full penis size by the time they're in their late teens, there is no single penis size that's "normal."

The size of your penis does not indicate how it will perform during sex or say anything about who you are as a person. As long as your penis functions for urination and sex without pain or other symptoms, you don't need to worry about its size.

It's not uncommon to feel anxiety about penis size, particularly during adolescence. Concerns about penis size usually stem from myths about sexual performance, physical attributes, and "manliness."

As you understand the facts about penis growth and become more confident in yourself, you will likely think less about the size of your penis.

If the size of your penis size is challenging its ability to function, talk to your healthcare provider. You can also get the opinion of a provider with more specialized knowledge who can diagnose and treat conditions related to the penis ( urologist ).

Pubic hair typically develops around the same time that the testicles and penis begin to grow; generally, between ages 10 and 14.
However, different hormones control pubic hair growth than those that control penile and testicular growth. 5 That means pubic hair may develop before or after the sex organs start to change.
Penis growth varies from person to person. For example, in a study of 6,200 boys, the researchers found that the average penis size increased 4.17 cm (about 1.6 inches) from age 10 to 16. 3
While those numbers can give you a general idea of average penis growth, it doesn't tell you about individual growth.
An erection is when the penis fills with blood and stiffens, which can happen during the day or at night while a person is sleeping. During puberty, it's not uncommon for people with a penis to even experience erections for no reason.
Erections can also happen before puberty, but they are more common and more frequent during this developmental stage. 6
Mautz BS, Wong BB, Peters RA, Jennions MD. Penis size interacts with body shape and height to influence male attractiveness . Proc Natl Acad Sci USA . 2013;110(17):6925-30. doi:10.1073/pnas.1219361110
Tomova A, Deepinder F, Robeva R, Lalabonova H, Kumanov P, Agarwal A. Growth and development of male external genitalia: a cross-sectional study of 6200 males aged 0 to 19 years . Arch Pediatr Adolesc Med . 2010;164(12). doi:10.1001/archpediatrics.2010.223
Prause N, Park J, Leung S, Miller G. Women's preferences for penis size: A new research method using selection among 3D models . PLoS ONE. 2015 Sep;10(9):1-17. doi:10.1371/journal.pone.0133079
Klein DA, Emerick JE, Sylvester J, Vogt KS. Disorders of puberty: an approach to diagnosis and management . AFP . 2017;96(9):590-599.
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