The length of the male penis varies slightly according to age, race, and physical condition. Generally speaking, the girth of our male penis is about 6 to 10 cm in a calm state. Generally speaking, the girth of the penis is used to measure the thickness of the penis. In our country, the girth of the penis of a normal male in a calm state without erection is 6 to 10cm as normal. If the diameter of the penis is used to measure, it is about 2 to 3cm is the normal range. If the penis is particularly small in adolescent males, or if there are no obvious secondary sexual characteristics, then it may be a developmental problem, and you should go to the hospital in a timely manner for the appropriate examination, and hormone supplementation or medication. It should be noted that do not pay too much attention to the size and length of the penis, to prevent psychological problems caused by excessive attention. And be careful not to stay up late at night, and develop a good sex life habits.