Average penis girth of an adult male?

Measurements: Vary significantly depending upon the study and methods. A review published in the 2007 issue of bju international showed the average erect penis length to be 14–16 cm (5.5–6.3 in) and girth to be 12–13 cm (4.7–5.1 in). Are you concerned that you don't "measure up". Relax, it's the only penis you'll ever have, and over half the population doesn't even have one at all.