Penis Length

Your erection length is defined as the linear distance along the dorsal (top) side of the erect penis, from the mons veneris to the tip of the glans. In non-medical jargon, your penis is measured in a straight, or for some arced, line on the topside of the erect penis, from where your belly meets the shaft to the tip of your penis. Take multiple measurements over the course of a few days and then average the values. Since your erections can vary slightly depending on your level of arousal, mood, room temperature, and even the duration since your last sexual encounter, averaging out a few measurements will let you get a more accurate read.

Penis Circumference

Penis circumference is defined as the linear distance around the widest part of the erect penis. Whether you use a piece of string or a fabric ruler, you should wrap it around the widest part of your penis, one time. If using string, make sure it is not stretchy, and mark the string at the correct spot and then measure the portion with a ruler. As with penis length, this should be done over a few days and the result averaged out.

The average erect penis length is 5.5 to 6.5 inches, and the average circumference is 4.5 to 5 inches.