I made this Sensitivity converter in Jscalc.
Convert from Source games/Quake, and overwatch to Quake Champions. Can also calculate your dpi and source/overwatch sens to cm/inch per 360.
I don't have definitive info about the sens in quake champions yet, but what from I can tell it has some sort of sharp climb multiplier as you raise your sens higher up and doesn't align with my calc.
For most cases this should get you a very good and accurate result.
Hope it's useful! :)