Editorial
Written byMen's Health Istanbul Editorial Team
Medical reviewer (awaiting sign-off)Prof. Dr. Zülfü Sertkaya
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The short answer
Most men are well within the normal range. A large review of studies in which health professionals measured over 15,000 men found an average erect length of about 13.1 cm, an average flaccid length of about 9.2 cm and an average erect circumference of about 11.7 cm. Most men sit close to these figures. Many men who worry about size are actually average, and the worry often comes from pornography, the angle from which you look down at yourself and self-measurement. A genuinely very small penis is rare and is usually identified in childhood.
Key takeaways
- In a large review of professionally measured men, the average erect length was about 13.1 cm and the average flaccid length about 9.2 cm.
- Most men who worry about their size are in the normal range.
- Flaccid size varies a lot with temperature and mood and says little about erect size.
- If worry about size is affecting your confidence or sex life, a doctor can measure properly and talk it through.
What is the average penis size?
The most useful answer comes from a 2015 review published in the BJU International. The researchers pooled studies in which a doctor or nurse, rather than the man himself, did the measuring. Self-reported figures tend to run high, so this matters.
Across the studies, which together included more than 15,000 men, the averages were:
- Flaccid length: about 9.2 cm
- Erect length: about 13.1 cm
- Erect circumference (girth): about 11.7 cm
Most men fall fairly close to these figures. Being a centimetre or two above or below the average is simply ordinary variation, in the same way that height or shoe size varies.
Why do so many men think they are small?
Worry about size is very common, and it is often out of step with reality. A few things feed it:
- Pornography. Performers are chosen partly for size, and camera angles exaggerate further. It is not a fair comparison.
- The view from above. Looking down at your own body foreshortens the penis. The same penis looks longer from the side or in a mirror.
- Changing rooms. Flaccid size varies with cold, stress and exercise, and the soft size of another man says little about his erect size.
- Body fat. A pad of fat above the pubic bone can hide part of the shaft, making the visible length shorter than the real length.
How do you measure penis length properly?
In research, erect length is usually measured along the top of the penis, from where it meets the pubic bone to the tip, pressing gently into any fat pad. Home measurements vary a lot depending on the angle, the firmness of the erection and where the ruler starts. If you want an accurate figure, a urologist can measure it in a matter-of-fact way as part of an ordinary appointment.
Does penis size matter to partners?
Size is one small part of sexual satisfaction. Communication, arousal, foreplay, erection quality and how relaxed both people feel usually matter much more. Anxiety about size can itself get in the way, by making sex feel like a test rather than something to enjoy.
When is a penis medically too small?
A genuinely very small penis, called micropenis, is a specific medical condition. It is rare, is usually linked to hormone development before birth and is normally picked up in infancy or childhood. It is not the same as feeling smaller than average.
Some men remain convinced that they are too small even when measurements are normal, and the worry can take over daily life. Doctors call this penile dysmorphophobia, a form of body dysmorphic concern. European urology guidelines recommend that men in this situation are assessed carefully and offered counselling, because reassurance and psychological support are often more helpful than any procedure.
Can anything change the size?
Supplements, creams and most products sold online have no good evidence behind them. Medical options exist for specific situations, such as treating curvature from Peyronie's disease or adding girth with fillers, but each has limits and risks. They should only be considered after a proper assessment and an honest discussion of what is realistic.
When to see a doctor
It is worth talking to a urologist if worry about size is affecting your confidence, relationships or sex life, if you have noticed a change in length or a new bend, or if erections have become less firm. These conversations are routine for specialists, and for many men a proper measurement and a frank explanation are enough to put the worry to rest.
Questions men also ask
Does flaccid size predict erect size?
Only loosely. Some men lengthen a lot during an erection and others less, so two men who look very different when soft can be similar when erect.
Can penis size change with age?
The penis does not shrink dramatically, but weight gain around the pubic area, reduced blood flow and conditions such as Peyronie's disease can make it look or measure shorter.
Do pills or pumps sold online make the penis bigger?
There is no good evidence that supplements increase penis size. Any procedure or device should be discussed with a urologist first.
Sources & further reading
- BJU International Am I normal? A systematic review and construction of nomograms for flaccid and erect penis length and circumference in up to 15,521 men (opens in a new tab) (2015) Veale D, et al.
- EAU EAU Guidelines on Sexual and Reproductive Health (opens in a new tab) (2024) European Association of Urology
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This article is general health information. It does not replace an individual medical consultation, examination or diagnosis. Read our editorial policy and medical review policy.
