Now researchers in the urology journal BJU International have provided the hardest answer to the question of typical penis size. They have published a meta-analysis of English-language studies measuring the penis size of more than 15,000 men across Asia, Africa, Europe, and the US. The median erect penis length, they find, is 5.1 inches — not six inches, as many think. If someone is above that, he’s bigger than most men. If someone is below that, he’s smaller than most men.