I was bored so I made up this formula A seemingly common average for males is 5'10 in height and 5 1/2" in penis length. 5'10 translates to 70" 5.5" out of 70"= roughly 8% So from this, you can kind of conclude that maybe on average, if your penis was sticking up from your head as if you were a magical penis unicorn, it'd make up about 7-9% of your body, if you are average. I am 6'1 and between 6 and 6 1/2" (let's just say I'm 6.3"), making me about 9%. I'd be an average magical penis unicorn with a very pretty horn. Do the math and let's hear your results!