Are you one of those men who constantly worries that your penis isn't of an adequate size? Then you may be suffering from "small-penis syndrome." (Yes, that's an actual medical term.) More likely, you are simply intrigued to know how your manhood measures up against the rest of humanity. Either way ... Human penis size is talked about by length and circumference of penis. It is longer than in other primates except for the chimpanzee. The chimpanzee's penis is about the same length. [1] The average human erect penis is about 12.9 to 15 centimetres (5.1 to 5.9 in) in length, the circumference is about 12.3 centimetres (4.8 in). [2][3][4] There is no scientific relation between either penis size or race, and shoe size or stretched penis size. At birth the penis is between 2.4 and 5.5 cm long ... Details and data regarding which countries have the biggest and smallest average penis sizes, as well as addressing certain myths and misconceptions regarding penis size. The average penis size is not nearly as big as many people think it is! A 2020 review of research on penis size found that the average length of an erect penis is between 5.1 inches and 5.5...