Proper measurement of male penis length can be done using a straight or flexible ruler after the male penis is fully erect. Men can use a ruler to measure the length of the penis in both the erect and atrophied states. When taking the measurement, the zero mark of the ruler is aligned with the root of the penis, and then the ruler is measured along the perpendicularity of the penis, and the value parallel to the very tip of the penis is the length of the penis. The penis can be measured in this way in both the atrophied and erect states. Normally, the male penis is around seven or eight centimeters in the non-erect state, and the length in the erect state is usually around thirteen to fourteen centimeters. There will be some variation between individuals, and being fat or thin may have a visual effect on the length of a man’s penis. To summarize, if you have penile problems, please seek medical attention.