ScienceDirect - The Journal of Urology : Penile Length in the Flaccid and Erect States: Guidelines for Penile Augmentation Click the pdf. They measure flaccid stretched length and then they did (non-bone pressed erect length) and also bone pressed erect length. And they measured girth at midshaft. Amazingly they even give the range of penises, so you can know the biggest one they measured. Here are the records in this survey of 80 men. erect length non bone pressed: 7.5 inches erect length bone pressed: 8.25 inches erect girth: 6.3 inches. and the averages: erect length non bone pressed: 5.1 inches erect length bone pressed: 6.2 inches erect girth: 4.85 inches The study was very scientific and included people from several races.