Sensitivity in Warface is unaffected by FOV, so that should matter. The default FOV is 75 in 4:3 resolution, for 16:9 it's 91.31.
As for a tool for measuring mouse distance, that's kinda what the analyzer does, but I guess the output could have been different for what you are asking. Maybe I can do some updates to it.
Are you using the steam version? I just checked against it, and the calculations are spot on for me.