To measure length: In the flaccid (soft) condition, clamp your penis head using your thumb and finger. Fully extend your penis to a comfortable stretch. Lightly press the ruler slightly (1/2" only) into the fat pad towards the pubic bone. Measure along your shaft without including your penis head.

To measure girth: Once again, fully extend your penis to a comfortable stretch. Use a measuring tape to measure the circumference of your shaft right behind the penis head. If you do not have a measuring tape, wrap a strip of paper behind your penis head. Mark the strip of paper and then measure the distance on a ruler.

After you’ve measured yourself and double-checked for accuracy, enter your length and girth into the drop-down menus. Our calculator will automatically choose the most suitable size for you. The size code will be shown in the display box for your reference. You may manually adjust it, if needed.