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If you want to skip this section, the average length of the penis is between 5 and 7 inches and the average erect girth is between 4 and 5.5 inches.
If you aren't from the US or maybe think NASA should measure everything in metric, view the metric version.
Kinsey Report
Dr. Alfred Kinsey provided the only medically verified large scale survey of penis size. Below is a graph showing the length results, alternatively Penis Length Table. To compare your size to this graph: measure your penis whilst fully erect, from the top, with the base of the ruler from the point at which the penis meets the skin around the pubic area without pressing in. If you are uncircumcised ensure your foreskin is retracted.
Enlarged Penis Length Graph
Below is a graph of erect girth against the percentage of men with that girth. To measure yourself, use a tailors tape or string and measure around the middle of the shaft when fully erect. Alternatively view the data in a Penis Girth Table
Enlarged Penis Girth Graph
This data was reinterpreted by Jamison and Gebhard (Journal for Sex Research 24: 177-183. 1988) to produce median results:
|
Mean Inches |
Standard Deviation +/- |
| Flaccid penis length |
3.89 |
0.73 |
| Erect penis length |
6.21 |
0.77 |
| Flaccid penis circumference |
3.75 |
0.65 |
| Erect penis circumference |
4.85 |
0.71 |
| Erectile increase in length |
2.30 |
0.71 |
| Erectile increase in circumference |
1.11 |
0.52 |
Kinsey has a survey size of 3,500.
The Definitive Penis Size Survey
This survey is something that leverages the power of the Internet. It is therefore self reporting but the similarity of the results to Kinsey are striking and so it seems reasonable to assume that bogus entries are overwhelmed by good entries.
The sample size is currently 2,545 which is slightly smaller than Kinsey but certainly enough to to provide good results. In this survey the length results are measured BP, which means the ruler is pressed into the pubic bone on the top of the penis. This removes the effect of the fat pad over the pubic bone which can easily be over 0.5". Most people on the forum push as as hard as possible when using this method, which may mean they are measuring longer than people in this survey for the same physical length. The girth shown is also larger than in Kinsey but girth is harder to measure and tends to increase if the erection is allowed to fade slightly whilst measuring, it is not unreasonable to assume that respondents will attempt to measure the maximum dimensions rather than the fully erect dimensions.
|
Mean Inches |
Standard Deviation +/- |
| Flaccid penis length |
3.4 |
1.1 |
| Erect penis length |
6.4 |
1.2 |
| Erect penis circumference |
5.0 |
1.0 |
This survey is well designed and comprehensive, also probing the psychology of penis size.
The Definitive Penis Size Survey.
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