Use the config file calculations for best range and accuracy.
Mouse Sensitivity Calculator and Converter
Total entries w/ special options
For a great collections of info, see Skidushe's excellent thread.
Also check out these instructional videos to get started; One covering the basics, and one covering Monitor Distance in details:
Version 7.1.d (September 24, 2018) - This is a brand new version with support for multi-calculations, see this thread for info!
The old version is available here so you can check if you encounter a bug.
New games: Last Tide, Monster Hunter: World, Ring of Elysium, Swarmlake, Hunting Simulator, Shadow of the Tomb Raider and Master Arena.