Well? What is Average? re: penis size [mraverage.com]


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    Source: http://www.mraverage.com/results.htm

    Well? What is Average?

    The quick answer is that the average length is somewhat under 6"
    and the circumference is just under 5".
    Penises ©xkcd.com

    Or to be more exact, the average length seems to be between 5.65" and 5.87". The average circumference between 4.67" and 4.97". Both depending on how you interpret the data.

    If you really want to go into detail, just keep reading.

    Here is the only survey that I’ve found that was anything like scientific, so probably gives as accurate an average as you are going to get. Even with this the raw data is not available, so I’ve just done the best I can with it.

    Lifestyles Condoms have conducted research into the average length and circumference of the erect penis during Spring Break in Cancun and found that the average penis length is 5.877 inches, with the majority ranging between 5.5 inches and 6.3 inches.
    The average girth is 4.972 inches, with the majority ranging between 4.7 inches and 5.1 inches.

    From March 11 to 17, a total 401 males over the age of 18 were measured, one at a time, by qualified medical staff (protected by gloves) in private tents at the Dady Rock nightclub in Cancun, Mexico. Of the 401 men, 300 were able to gain an erection for measurement — a success rate of only 75%.

    Measurement methodology
    The following criteria were enforced by a doctor and a team of four nurses, who attended each of the seven nights of the penis size research. Measuring of length was from the point at the base of the erect penis where the top of the penile shaft meets the pubic area to the tip of the glans (“head”). For uncircumcised men, the foreskin was retracted. Measuring of girth was at mid-shaft around the circumference of the penis when the penis was erect. Failure to gain an effective erection for measurement disqualified the volunteer from being included in the data for the calculation of average erect penis length and girth.

    Fantasy overloadEnvironment
    The majority of participants were U.S. college men, but it was not limited to this group. Volunteers were asked to enter a private area, where they would gain an erection and then call for the two nurses to measure their erect penis. (Male fantasy overload.) To ensure the accuracy of the data, each erect penis was measured by two of the nurses. A doctor supervised the nurses and all activity.
    Volunteers tended to be groups of friends, which helped ensure a wide range of penis sizes (big and small) and provide a more accurate average figure.

    Sample size
    The sample included 401 male volunteers, of which only 300 were “effective” male volunteers (75 percent), because 101 volunteers (25 percent) could not gain an erection for measurement. At 300 effective measurements, the study was twice the size of any previous study that used medical staff to measure penis size. This method is more accurate and reliable than studies in which volunteers undertake self-measurement/reporting.
    Yes I do know that these statistics have flaws, but it’s the best I could find, without using any self reported measurements. There is a more in depth analysis of the results here.

    Erect penis length
    The average erect penis length was 5.877 inches (14.928 cm). Standard deviation was 0.825 inches (2.096 cm) with 54 percent of the effective sample measuring between 5.5 inches (14 cm) and 6.3 inches (16 cm).

    Length

    % of men

    3.50" to 3.75"

    0.2 %

    3.75" to 4.00"

    0.3 %

    4.00" to 4.25"

    0.2 %

    4.25" to 4.50"

    0.7 %

    4.50" to 4.75"

    0.8 %

    4.75" to 5.00"

    2.0 %

    5.00" to 5.25"

    9.0 %

    5.25" to 5.50"

    10.8 %

    5.50" to 5.75"

    24.3 %

    5.75" to 6.00"

    23.9 %

    6.00" to 6.25"

    9.3 %

    6.25" to 6.50"

    6.7 %

    6.50" to 6.75"

    4.4 %

    6.75" to 7.00"

    2.9 %

    7.00" to 7.25"

    1.0 %

    7.25" to 7.50"

    1.0 %

    7.50" to 7.75"

    0.9 %

    7.75" to 8.00"

    0.8 %

    8.00" to 8.25"

    0.3 %

    8.25" to 8.50"

    0.3 %

    8.50" to 8.75"

    0.1 %

    8.75" to 9.00"

    0.1 %

    Source: Lifestyles Condom Co., 2001

    Erect penis girth
    The average erect penis girth was 4.972 inches (12.63 cm). Standard deviation was 0.508 inches (1.29 cm) or with 53.33 percent of the effective sample measuring between 4.525 inches (11.5 cm) and 5.118 inches (13 cm).

    Circumference

    % of men

    Under 3.00"

    3.3 %

    3.00" to 3.25"

    0.4 %

    3.25" to 3.50"

    0.9 %

    3.50" to 3.75"

    1.1 %

    3.75" to 4.00"

    4.7 %

    4.00" to 4.25"

    6.3 %

    4.25" to 4.50"

    17.1 %

    4.50" to 4.75"

    11.7 %

    4.75" to 5.00"

    24.1 %

    5.00" to 5.25"

    9.9 %

    5.25" to 5.50"

    11.5 %

    5.50" to 5.75"

    3.0 %

    5.75" to 6.00"

    3.9 %

    6.00" to 6.25"

    0.5 %

    6.25" to 6.50"

    0.5 %

    6.50" to 6.75"

    0.1 %

    Source: Lifestyles Condom Co., 2001

    The Geeks out there will notice that this is nowhere near a normal distribution, which makes the mean and standard deviations a bit difficult to interpret. More here.

    Even these results might be an exaggeration
    because:

    1. Even in groups, you are more likely to attract customers who feel they have something worth showing.
    2. It’s possible that the more cock-sure ones, would find it easier to get an erection.
    3. The statistical distributions mean that the average is not the same as typical. I’ll try too explain that here.

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