Just follow this link: Mr Average? So you just have to enter your lenght and girth, and you will get some stats about where you are situated compared to the average penis. The site is considering the actual volume of your erection, not only the lenght. Mine has a volume 22% bigger than the High Average. If you follow this link: Mr. Average - The true story about penis size, from a site that isn't trying to sell you anything. You will be able to know how much a standard condom would strech on your erection and how much blood you need to have an erection. Completely useless to know but it may be intereting.