To this day, I'm still not sure how long my dick is. There are just too many ways to measure.
Let's say I'm fully hard. I'll always measure with a hard ruler on top and my dick bent straight to account for my upward curve. Standing as straight as possible, with no weird pelvic thrusting, and the ruler pressed to the bone, I'm 8" (as near as I can determine). If I press under the pubic bone, I can get it to 8 1/4". Measured sitting down, I also get 8 1/4". For some reason when I measure lying down on my back, I lose A LOT of length. Probably half an inch in comparison to the first method. Maybe more. Again, the angle of the pelvis seems to make a huge difference for me. My fat pad's a little less than half an inch with the first method and varies with the others.
In any case, if anyone asks, I just say I'm 8".