Worried about your penis size? At some point, just about every dick size huge has wondered how their penis stacks up compared to the average. When it comes to the circumference the circular measurement around the penisthe average man is about 3. Erect, the average penis is about 5. Penis size is a common source of anxiety for men. The review, which can be viewed online hereis currently the most comprehensive study available on penis size, drawing from a total of 17 studies with more than dick size huge, participants. As stated above, the researchers found that the average penis size -- using a sample of more than 15, men -- was 3.