Hiya folks... This might be a rediculous question or w.e. but I used to play with sensitivity 0.74 & cl_mouseaccel 0.0047 at 4000 dpi (razer lachesis) but my lachesis went broke so now i'm using a deathadder at 1800 dpi & I'm trying to calculate to come to a sensitivity that comes near the sensitivity & accel i had with 4000 dpi, i mean, the feeling, but just don't know how to calculate it again...

Could someone maybe help me out on this one?