Human penis size refers to the length and width of human male genitalia. Interest in larger penis sizes has led to an industry devoted to penis enlargement.

Compared to other primates, even larger primates such as the gorilla, the male human genitalia are remarkably large. The human penis is both longer and thicker than that of any other primate both in absolute terms and in relative size compared with the rest of the body

Studies of penis size show the 'average' erect penis ranges from 5 to 7 inches (13 to 16 cms) with a girth of about 4 inches (10 cms).

An average non-erect penis ranges between 2 to 4 inches (5 to 10 cms). Very few men have longer than average penises when erect.