Kevin B., L.A., 17 years
Q: My dick is 6 inches long. Is that small? Or is it average? How large is the average dick?

A: Here are the statistics on erect penis lengths for white college men, in quarter-inch lengths measured by The Alfred C. Kinsey Institute for Sex Research (from the point where the penis meets the body along the top to its tip):

percent length
0.2 percent 3.75 inches
0.3 percent 4 inches
0.2 percent 4.25 inches
1.7 percent 4.5 inches
0.8 percent 4.75 inches
4.2 percent 5 inches
4.4 percent 5.25 inches
10.7 percent 5.5 inches

percent length
8 percent 5.75 inches
23.9 percent 6 inches
8.8 percent 6.25 inches
14.3 percent 6.5 inches
5.7 percent 6.75 inches
9.5 percent 7 inches
1.8 percent 7.25 inches
2.9 percent 7.5 inches
percent length
1 percent 7.75 inches
1 percent 8 inches
0.3 percent 8.25 inches
0.3 percent 8.5 inches
0.1 percent 8.75 inches
0.1 percent 9 inches

(note: 1 inch = 2.54 cm, 0.25 inch = 0.635 cm)

Here the same data in some other from:

So the average penis length is 6.16 inches.
The average girth is 4.84 inches.

More recent studies have produced the following results:
A sample of 60 men studied by researchers at the University of California at San Francisco determined that the average size of their erect penises was 5.1 inches long and 4.9 inches in girth. A Brazilian urologist who measured 150 men reported that the average size of their erections was 5.7 inches long and 4.7 inches in girth.