"There is only one correct way to measure your penis. The bone-pressed length. To find it, induce as strong an erection as you can, stand up, lay a hard ruler flat along the top of your penis, and push the ruler in towards your pubic bone. Try to straighten out any curve you may have, but be gentle; it is possible to fracture your penis, though it is unlikely you could do it to yourself without meaning to. The farthest point the ruler reads is your standardized erect length. Anything else is frauding. Measuring from the side, measuring from the bottom, measuring with a tape measure. All frauding."
Taken from Looksmax.org
Even when I measured it starting from my balls it was still like 5 inches max which is probably too small anyway