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More penis measurements8,9
A number of different studies have sought to determine an average penis size. One published in 2001 took measurements of 3,300 young Italian men aged between 17 and 19 years.
It found the median average length of flaccid penises was 9 centimeters (3.5 inches), and the flaccid circumference (at the middle of the shaft) was 10 centimeters (3.9 inches).
Another study examined a different population, of 301 physically normal Indian men, and sought to compare its results with size findings in other countries.
The results, the authors of the 2007 study said, "will help in counseling the patients worried about the penile size and seeking penis enlargement surgery."
- Flaccid: mean average length was 8.2 centimeters (3.2 inches) and circumference (of stretched flaccid penis) was 9.1 centimeters (3.6 inches).
- Erect: mean average length was 13.0 centimeters (5.1 inches) and circumference was 11.5 centimeters (4.5 inches).
The Nature-published paper included a table that listed previous findings on penis dimensions (see previous reports on penile dimensions).
Research studies have measured penis sizes and found an average - the typical erect penis would fit well within the range shown on this ruler.
Of the 16 studies they cited, from various countries, the earliest was carried out over a hundred years ago and published in 1899. They all arrived at similar average penis lengths:
- Flaccid lengths ranged around 7 to 10 centimeters (2.8 to 3.9 inches)
- Flaccid circumferences ranged around 9 to 10 centimeters (3.5 to 3.9 inches)
- Erect lengths ranged around 12 to 16 centimeters (4.7 to 6.3 inches)
- Erect circumference (only one previous study) was around 12 centimeters (4.7 inches).
Heightened concerns, 'misguided' desires for enlargement9,10
The male sex hormone regulates sperm production and sex drive, but it has a number of other roles, too.
The authors of the study from India wrote that the definition of normal penile size was of "considerable interest" as there was a "steady increase in the number of people complaining of 'short penis' and seeking penile enlargement procedures."
Other research has suggested that most men who seek surgery to lengthen their penis have an overestimated view of what a normal penis length is.
In the study of 67 men complaining of a short penis, none was, in fact, found to be severely short. The authors said there was an increasing number of men seeking surgery to lengthen their penis.
Only a small effect of obesity and age on erect penis size11
In 2015, researchers in Saudi Arabia published the results of a retrospective cohort study of 778 men with an average age of 43.7 (ranging from 20 to 82 years) who attended urological outpatient clinics in Saudi Arabia.
Men were excluded from the study if they were under 18 years old, presented with a complaint of small or short penis, Peyronie's disease, congenital curvature, clinical hypogonadism, and/or previous penile surgery or trauma.
After medically inducing an erection the researchers took measurements and established an average:
- Penis length of 12.53 centimeters (4.9 inches) from the skin over the pubic bone to the penile tip
- Penis length of 14.34 centimeters (5.6 inches) from the pubic bone to the penile tip
- Penis circumference of 11.50 centimeters (4.5 inches).
The researchers also measured the men's body-mass index (BMI), which increases with obesity. There was a weak correlation between greater BMI and shorter erect penile length when this was measured from the skin over the pubic area, but not when the measurement was made from the bone to the tip.
Common sense tells us, therefore, that the penis appears to be shorter when there is more fat under the skin at the visible base of the penis.
This study also showed a weak correlation with increasing age for erect penis dimensions, although the authors noted that slight decreases in size may be of limited concern to "aging men" - they found "the difference between men of 70 and 20 was less than a centimeter."
Recent developments on penis size from MNT news
A new finding shows evidence of a link between the relative length of a man's index and ring fingers and a way to predict the length of his penis.
Men who want surgery to increase the length of their penis should try non-invasive methods like penile traction devices or extenders first, and in some cases, even try therapy to make them feel more confident about their bodies, said Italian urologists in a paper published in the April issue of the British Journal of Urology International.
A lot of men worry about their penis size. But researchers hope the results of a new study, which reveals the average penis length, will reassure many men that they are 'normal.'