https://www.youtube.com/watch?v=mramUdOqk00&feature=youtu.be
calulator:
https://jscalc.io/calc/mubt6HqWg3LA6Rt0
spreadsheet:
https://docs.google.com/spreadsheets/d/1Ma0S5r5lUb73V7N5Y-JDZjsWbQj2wqmqPgApOSUXt_Q/edit#gid=1958103304
source:
https://www.reddit.com/r/Overwatch/comments/3th2pm/how_to_convert_your_mouse_sensitivity_to_overwatch/