How does the converter keep my aim the same?
Every game turns your view by a fixed angle for each "count" your mouse reports, multiplied by your in-game sensitivity. The converter works out how many degrees one count turns in the game you play now, then finds the sensitivity that turns exactly the same amount in the new game. The result is the same distance on your mouse pad for a full 360° turn, which is what your muscle memory actually knows.
What is cm/360, and why do players compare it?
cm/360 is how far you move the mouse to spin all the way round. Unlike the sensitivity number, it means the same thing in every game, so it is the fairest way to compare setups. A low number is fast and a high number is slow and precise; there is no right value, only the one that lets you turn fully without running out of mouse pad. Changing DPI changes the in-game number you need, but not the cm/360 you are aiming for.
What is eDPI?
eDPI is your DPI multiplied by your in-game sensitivity. It is a quick way to compare two players in the same game: 800 DPI at 1.25 and 400 DPI at 2.5 are both 1,000 eDPI and feel identical. It does not carry across games, because each game turns a different amount per count; use the conversion above for that.
Where do the game values come from?
Each game shows how sure we are. From the game files means the value is read from the game's own settings (CS2's console variables). Official formula means the developer publishes how the setting works (Rainbow Six Siege) and the base value comes from community converters. Community value means several independent converters agree but the developer has not published it; where one source differs (Valorant, Fortnite), we use the value most sources give and list the other. PUBG is not included: its slider is not a single fixed constant.
Does this cover scopes and aiming down sights?
No: this is hipfire only, the sensitivity you use when not zoomed in. Scope and ADS sensitivity depend on each game's own multipliers and field of view, and many players tune them by feel after matching hipfire.