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The number in your settings menu is not a universal scale. Each game rotates your view by a different amount per count of mouse movement, so the same figure produces a different physical swipe in every title. Converting properly means holding one thing constant, the distance your hand travels for a full turn, and solving for the new number.
Two of the constants this site uses are documented and two are not, and we would rather say so than print four numbers that all look equally official. The Source engine value is verifiable in-game; Valorant and Overwatch 2 figures are community measurements that converters agree on. Games whose published constants conflict, or which layer extra scaling on top, are left out rather than guessed.