DPI: mouse counts over distance
DPI is the mouse’s configured count density. At a higher DPI, the mouse reports more movement counts over the same physical distance. DPI alone does not determine how fast the camera turns because the game still decides how much rotation each count produces.
In-game sensitivity: rotation per count
The horizontal sensitivity setting scales the counts received by the game. A higher value usually rotates the camera farther per count, but the scale is game-specific. That is why the same numerical setting does not reliably transfer between games.
eDPI: useful inside one game
eDPI is convenient for comparing players using the same game and the same sensitivity scale. It is not a universal physical unit. Two games can produce different turn distances from the same eDPI because their camera constants differ.
Changing DPI without changing feel
For a linear game, doubling DPI and halving the in-game sensitivity preserves approximately the same physical turn distance. The calculator performs the game-specific conversion where a credible numerical reference is available; physical verification remains the final check.
Desktop pointer speed is separate
Windows or macOS pointer speed controls ordinary cursor movement. Many FPS games use raw input and bypass that processing. Keep desktop movement comfortable, keep the calibration setup unchanged, and apply the result through the game’s horizontal hip-fire controls.
What MouseCalibration needs
DPI is optional during discovery. A count-based result transfers into supported games while the same DPI remains active. Add a measured reference to receive cm / 360°, which remains meaningful when you later change DPI.