When soft, a penis is usually between 6 and 13 centimeters long. An erect one is usually somewhere between 7 and 17 centimeters long. The average is about 12 centimeters. Smaller penises grow more in size when they become erect compared to large penises.
Some boys and men joke a lot about the size of their penis or other people's penises. It’s often because they feel insecure, or because they want to look tough, or they want to make up for lack of knowledge.
If you want to measure your penis, do it when it’s erect, on the top side – the side closest to your belly.