eDPI = DPI x in-game sensitivity - the number that lets you compare sensitivity across setups. Free, no signup.
Pro eDPI averages: CS2 ~800, Valorant ~280, Apex ~1400, Overwatch ~4000.
Effective DPI = mouse DPI x in-game sensitivity. It normalizes sensitivity so you can compare two players even if their DPI differs.
Roughly: CS2 ~800, Valorant ~280, Apex ~1400, Overwatch ~4000. Lower eDPI means slower, more precise aim.