How long is a man's penis normal?

In general, male penis weakness state reached 3.7 cm, and erection reached 9cm are normal.

Male individual differences, so the penis normal value is different, usually weak state, penis length reached 3.7 cm is normal, will not affect sexual life. Secondly, male penis erection after the length, volume and other weak state increased, at this time reached 9cm is normal value.

If the male penis is too short, need to carry out sex hormone six, ultrasound, CT and other examinations, according to the results diagnosed. If due to congenital factors, surgery can be performed to lengthen the penis.