Fact & research on average penis size, what is normal length, girth (width/circumference) for a human

Below is a list of over 40 studies from 1899 to 1914, measuring average penis sizes, using different methods, different states (flaccid, stretched, erect) across different countries and across different ages, conducted by different researchers.


Average and normal penis size studies from different countries
Dozens of studies into average penis size came up with varying results


These studies were mostly conduced in the scientific fields of urology, virology and there are also a few commercial studies from condom manufacturers, from experiments in ED (erectile dysfunction treatments) and research into other medical/sexual problems.

A short answer would find the mean of the studies - the arithmetic averages.

The long answer would inspect the mean and the standard deviation of the best studies - to establish the averages and the spread of data, to see what is normal for the population of different ethnicities.



The short answer to the question of "What is the average penis size?" as a mean average of above studies:


Approximate average erect penis length:

13.85 cm = 5.45 inches*


Approximate average erect penis girth (width/circumference) :

12.01 cm = 4.73 inches*


*There are documented differences in averages between various ethnicities and ages.


Ethnicity and average penis size:


There appears to be a difference between the findings for different ethnicities, therefore it makes sense to narrow down the penis size averages by ethnicity. However, Chen, Li, Yang and Dai conducted an excellent study in China, in Yunnan province (known for its ethnically diverse populace) in 2014. They discovered, in a very thorough research that even among the local ethnicities the averages of penis sizes varied.

If this is true for people in one country, in one province, of one race and one nationality, it is reasonable to suggest that there is a major variation of penis sizes for different ethnicities. However, since the world today is a melting pot and has been thus for the last few centuries, the averages should be flattening out. However, to have a general idea of what is normal/average penis sizes for different ethnicities, we can use the mathematical principles of mean and standard deviation to assess the ranges of penis sizes for different ethnicities.

After analyzing dozens of studies mentioned above. Some (especially the early ones) are not very concise in terms methodology and some other used questionable methodologies/ substandard measuring techniques and will not be used for our precise estimates.

Some studies were of questionable methodology and therefore provided inaccurate findings.

The correct way to measure penis length and girth has been discussed in this article and only the studies using this method, the proper way, were used to compute the averages and ranges to achieve consistency.

How penis size should be measured:

In short, the girth is measured in the middle of the shaft and the length is measured by pressing a ruler against the pelvic bone above the penis, at the base and measured from the base to the tip of the glans (also known as head).


The findings across multiple studies have been prioritised in this order:


  1. Studies where the measuring was conducted by trained professionals, hospital and clinic staff (including commercial studies such as the Ansell Condoms (Manufacturer of Lifestyles/Mates condoms).
  2. Studies where the measuring was conducted by self report, motivated by condoms they were ordering that matched their sizes
  3. Self-report studies.
Average penis size, length and girth (width/circumference) by ethnicity
Average penis size, length and girth (width/circumference) by ethnicity


What is the real global average erect penis size: length and girth (width/circumference)?


Approximate global average erect penis length:

13.71 cm = 5.4 inches

Approximate global average erect penis girth (width/circumference):

11.55 cm = 4.54 inches


The global average was calculated and approximated using the following ratio of global population by race, there is limited data on countries in South-East Asia and South Asia which account for almost 30% of the global population.

White 15% ; Hispanic 8% ; Black 15% ; Middle Eastern 8% ; Asian 54% : East Asian 24% (Korea, Mongolia ,China, Japan) ; South Asian 21% (India, Sri Lanka, Pakistan, Bangladesh, Nepal) ; Southeast Asian 9% (Cambodia, Burma, Philippines, Malaysia)


Average penis length and girth by ethnicity - charts and comparisons

Chart and comparison of average penis length by ethnicity


Average penis girth by ethnicity in cm

These averages are subject to change as new data becomes available and as old data is revised.

The data gathered even from these multiple studies on penis sizes is insufficient to report anything conclusively and the subject of average penis length and girth (width/circumference) requires further study, a more precise methodology and a larger sample, a cross section of the population, across different ethnicities, of different countries, of different ages, of different heights, of different lifestyles.


The broad average range of penis sizes for different ethnicities - what is normal?


Standard deviation and what is normal in examples of height and penis size


Not everyone is familiar with data spread and standard deviation, so we will provide the example of height in the United States (2010) with averages and standard deviation. Using the standard deviation (SD) will allow us to understand what is normal, as everyone has their own view on what normal is.

Standard deviation allows to establish the range of results, to achieve understanding of what is normal, normal height or normal penis size.

Standard deviation is a method of identifying the average range across data by seeing how much variation there is by assessing how spread out the data is from the mean. There is an 68–95–99.7 rule, also known as the three-sigma rule or empirical rule, which illustrates nearly all values are within three standard deviations of the mean. Which means that in a perfect sample of data, 68% of the data will fall within one SD of the mean, 95% of the data will fall within 2 SD of the mean and 99.7% of the data will fall within 3 SD of the mean.

The spread of an example standard deviation graph


What is normal in an example of male height in the United States

In US men's heights have a mean of 69.1 inches (175.5cm) and standard deviation of 2.9 inches (7.3cm), while female's heights have a of mean 63.7 inches (161.8cm) and standard deviation of 2.7 inches (6.6cm) according to data from 2010.


From this graph we see what is normal and what approximate percentage of the US male population fits within these percentages.

US Male Height (2010) by percentages of population


With the average height is 175.5cm of the men in US (2010) , with the standard deviation of 7.3 cm and 68–95–99.7 rule we can say the following:

68% were 168.2-182.8 cm tall

95% were 160.9-190.1 cm tall

99.7% were 153.6-197.4 cm tall

Which sounds very reasonable. Therefore the same approach can be used to analyze average human penis size ranges. If you think of the extremes, then men shorter than 153.6 cm (under 5 feet) are as rare as men whom are 197.4cm tall (over 6'5), each would be around 15 out of 10000. Even if you consider the NBA, which appears to be a sport for the tallest of people, the average height of NBA players is 6'7, even by these standards, in USA Alone there would be  around 250,000 men taller than 6'5, but considering that the population of United States is 316,000,000, and half of that is men - the number of 250,000 doesn't sound that massive = 0.15 % out of over 300 million. Consider this when thinking of extreme penis sizes, the smallest and the largest penises are in clear minority.


Ethnicity-based average erect penis size : length and girth (width/circumference)

Caucasian, white, non-Latino, Mediterranean - Mainly Europe, Russia, North America, Australia, New Zealand


Erect penile length: 14.50 cm - 5.7 inches

Standard deviation: 2.4 cm - 0.95 inch


Erect penis girth: 12.25 cm - 4.8 inches

Standard deviation: 1.30 cm - 0.50 inches

Caucasian white average and normal penis size range length and girth
Caucasian/White average and normal penis size range: length and girth

Hispanic, Latino  - mainly Mexico, Central America, North America, South America


Erect penile length: 14.45 cm - 5.7 inches

Standard deviation: 2.4 cm - 0.95 inches


Erect penis girth: 12.30 cm - 4.8 inches

Standard deviation: 1.30 cm - 0.50  inches

Latino/Hispanic average and normal penis size range: length and girth
Latino/Hispanic average and normal penis size range: length and girth

Asian-American (perhaps similar figures for Asian Australians, Asian New Zealanders, etc, in US alone there are up to 12 million Asian-Americans)


Erect penile length: 14.15 cm - 5.6 inches

Standard deviation: 2.89 cm - 1.14 inches


Erect penis girth:12.10 cm - 4.75  inches

Standard deviation: 2.35 cm - 0.9  inches

Asian-American average and normal penis size range: length and girth
Asian-American average and normal penis size range: length and girth

Black, African, African-American, Afro-European - Mainly in Africa, North America, Europe, Middle-East


Erect penile length: 14.75 cm - 5.8  inches

Standard deviation: 3.1 cm - 1.2  inches


Erect penis girth: 12.29 - 4.8  inches

Standard deviation: 2.57 cm  - 1  inch

Black/ Afro-American average and normal penis size range: length and girth
Black/ Afro-American average and normal penis size range: length and girth

Middle-Eastern -  mainly Arab Peninsula, Israel, North Africa, Near East, Central Asia


Erect penile length: 13.90 cm - 5.5  inches

Standard deviation: 2.4 cm - 0.95 inches


Erect penis girth: 11.90 - 4.7 inches

Standard deviation: 1.30 cm - 0.50 inches

Middle-Eastern average and normal penis size range: length and girth
Middle-Eastern average and normal penis size range: length and girth

East Asian - mainly China, Japan, Korea, Taiwan, Mongolia


Erect penile length: 12.90 cm - 5.1 inches

Standard deviation: 1.3 cm - 0.5 inches


Erect penis girth: 10.5 cm - 4 inches

Standard deviation: 0.9 cm - 0.35 inches

East-Asian average and normal penis size range: length and girth
East-Asian average and normal penis size range: length and girth

South Asian - mainly India, Sri-Lanka, Bangladesh, Nepal, Pakistan


Erect penile length: 13.01 cm - 5.1 inches

Standard deviation: 1.62 cm - 0.6 inches

Erect penile girth: 11.46 cm - 4.5 inches

Standard deviation: 1.35 cm - 0.5 inches

South-Asian average and normal penis size range: length and girth
South-Asian average and normal penis size range: length and girth

South East Asian - mainly Cambodia, Thailand, Philippines, Indonesia, Singapore


Erect penile length: 13.65 cm - 5.4 inches

Standard deviation: 1.5 cm - 0.4 inches

Erect penile girth: 11.2 cm - 4.54 inches

Standard deviation: 0.9cm - 0.35 inches

South-East Asian average and normal penis size range: length and girth
South-East Asian average and normal penis size range: length and girth


Main points:


  • Ethnicity is a decent indicator of penile dimensions for ethnic groups.
  • Ethnicity is not a good indicator of penile dimensions for individuals, not because of the averages but because of the spread of data, the standard ranges of sizes.
  • There is a large difference between Asian-Americans and Asians, which suggests environmental factors rather then hereditary ones.
  • Ranking of average penis lengths across ethnicities
    • African-American/ Black
    • White/Caucasian = Hispanic/Latino
    • Asian American
    • Middle-Eastern
    • South-East Asian
    • South Asian
    • East Asian
  • Ranking of average penis girth across ethnicities:
    • African-American/ Black = Hispanic/Latino
    • White/Caucasian
    • Asian American
    • Middle-Eastern
    • South-East Asian
    • South Asian
    • East Asian
  • African-Americans/ Blacks have larger spread of results, therefore are more likely to have a larger variety of penis sizes then for example Whites and Hispanics and therefore more extremely large and extremely small penises, in comparison to the White/Hispanic population. 
  • More data is needed



Environment's effect on human penile dimensions


There appears to be a large difference between Asian and Asian-American when it come to average penis sizes, as with the points above there the hereditary factors play a role along with the environment.

There appears to be a weak correlation of penis size to height and there is a significant height difference between Asians in Asia and Asian-Americans. Whilst this alone is not enough to play a significant enough role, the diet and the lifestyle of the people might differ significantly, both in the womb and during puberty which may play a significant role.

Also, the Asian-Americans may be a second generation of mixed race couples and therefore would have a larger variety across gene pool which is beneficial for the individual in general. Across many mammal species the larger, healthier specimens are often an example of two diverse individuals coming together.

It may also be that the larger penis size related genes are dominant and therefore more likely to be passed on to the next generation.

This, like much about sexual health and physical characteristics needs further study, however if we take for example height as a well studied physical characteristic and compare it to penis sizes:


Humans are about as diverse as it is for human male height and there is about 10-15 % difference for averages for both penile dimensions and height, which may be correlated.


Average male height in India (shortest?) is 162.2 cm

Average male height in Holland  (tallest) is 183.8 cm

About 13% difference


Average East Asian penis length 12.90 cm

Average African-American/ Black penis length 14.75 cm


About 14% difference


As you can see the difference between extremes is minor, but it may be mostly related to the diet and lifestyle of individuals. It is believed that diet and lifestyle has a massive effect on height of a human being, it may be similar for other physical characteristics, such as the penile dimensions. Moreover, studies in Asia shown that in countries such as Singapore and Hong-Kong where the standards of living are higher than that of neighbouring regions, people tend to be taller. In North America and Europe however, there may be a difference between urban and rural, because of lifestyles, diet (consider fast-foods effect on well being on the individuals, especially in inner cities).

Age and average penis size


Age and penile dimensions appear not to be correlated amongst adults. Until about the age of 50, when length remains the same but the girth or the width of erect penis decreases.

Average penis girth of American Men aged 18-49 and over 50.

Age 18-49: 12.25 cm

Age 50+ : 11.95 cm

Age appears to have an effect on penile dimensions after the age of 50, as average girth (width/circumference) during erection lessens, whilst width remains the same.

After the age of 50 and sometimes before, men start to experience various sexual health related issues, such as ED (erectile dysfunction ) - this problem is a symptom of a worsening blood flow, which would incidentally affect the width of the erect penis. For this reasons, despite finding there being no significant difference between average penis lengths for men of different ages, there is a significant difference between average penis girth of men under and over 50.



Why men worry about their penis sizes


The human male is often worried about the penis size. Most of this worry comes from the uncertainty as to what is the normal penis size.  With the help of adult media, annoying spam and tabloids, many men place great importance upon the reproductive organ, as a sign of masculinity.

The hegemony of masculinity, requires a male to display physical attributes such as strength and bulkiness. There is also some importance placed upon the feats of sexual conquest and the sexual prowess, and although not all men resemble or seek such masculinity - there is a social pressure to adhere to it.

Penis size is regarded as a sign of masculinity

If you've ever had an email account, especially in the 00'ies, before decent spam filters evolved,  you've come across a lot of spam that built on these misstatements with aggressive email content and even more aggressive subjects, which even without reading the contents, made men whom were happy with their measurements feel somewhat unnecessarily compared and dehumanised.

It is not only the erect state of the penis that worries men but also the flaccid state, a large proportion of males do no wish to uncover their genitals in areas where it is practical and socially acceptable (think gym changing rooms and saunas). It is worth pointing out that the dimensions of flaccid penis do not reflect the dimensions of an erect one. Having a small flaccid penis is completely normal.




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