I have a 1920X1080 laptop monitor, I have the graphics at 1600X900 (still covers thewhole screen pannel) and the sens that is about right is 1.25, which is supposed to be 11.4573 inches, but is comes out as 12" on my mousepad. It originally gave me 0.89 as 12 inches but took me off my mousepad. I normally use 75-80% of the pad for 360 deg. I see it now shows 1.25 as 11.4 inches which is close enough for now. Edit: I meant it never gave me the option of setting the intended res as window is 1920x1080 and RES is not supposed to effect the sens.