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Thread: What's the average girth?
 02052010 #11
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Ps, standard deviation appears to be circa .8" for length and .5" for girth.
There is a stats blip for girth slightly ove 5" other than that typical pattern is followed.
 02072010 #12
Pegasus, thanks. I wonder if the 5"+ girth blip is significant.
 02072010 #13
 02082010 #14
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Standard deviation is a measure of variance or "spread" of a random variable from its mean value. It is usually assumed that adult penis length and adult penis girth are random variables that follow a "normal distribution" (which may or may not be true). A normal distribution is represented by the familiar "bellshaped curve". But a bellshaped curve can be broad and relatively flat, or it can be steeply peaked and narrow. A steep, narrow bellshaped curve will have much less variance of its possible values from the mean than one which is broader and flatter.
If you had a finite sample set for a random variable, you could compute a mean. You could then take each recorded value for that variable, calculate its deviation from the mean, square that deviation, and multiply the result by the number of times that value was observed. You could then add up all of the results for each and every recorded value and you would have the total variance. The standard deviation is actually the square root of the variance for that sample set. It is also sometimes referred to as the rootmeansquare, which is the square root of the mean squared deviation of a quantity from its baseline (which is what the variance is).
OK, too much math for most. The important thing is the standard deviation determines the liklihood with which the value of a random variable will depart widely from its mean. For a normal distribution, one standard deviation in each direction from the mean value (both greater and lesser) will account for 68% of the observed values. Two standard deviations will encompass 95% of the possible values and three standard deviations will account for about 99% of values.
So if for the sake of argument we said that average penis girth was 5.0 inches and followed a normal distribution with a standard deviation of .5 inches, 68% of men would have a girth between 4.5 and 5.5 inches, 95% would have a girth between 4.0 and 6.0 inches and 99% would have a girth between 3.5 and 6.5 inches. Only about 0.5 % (1 in 200) men would have a girth greater than 6.5 inches and only 0.5% would have a girth less than 3.5 inches.Last edited by redbear52; 02082010 at 12:06 PM.
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 03312011 #17
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So only about 1% of men have a girth of 6 inches or more?
 03312011 #18
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hmmn whats the "average" girth... ive always been curious about this too.. is this mid shaft or base girth?
 03312011 #19
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About 2.5% according to what redbear posted. 1% are 6.5" or up. According to that.
Obviously the only way to find the true average would be measuring like 50% of the people on the planet (from everywhere). 100% would be better, but there has never been a study with enough people to make it actually true.Starting Size (09/2009): ~7"BPEL x ~5" MSEG
Most Recent Measurement (08/13/2012): 8"BPEL x 5.5"MSEG
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