 How to Measure Penis Length is measured in inches from the base of the penis shaft (top view) to the tip of the head when fully erect. Penis circumference is measured at the greatest circumference when fully erect. Wrap a piece of string around the base of your erect penis and mark with a pen where the two ends overlap. Measure this distance against a ruler. This is your circumference. Scrotum size should be evaluated subjectively in relationship to your flaccid penis.
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