Swipe across the pad slowly, then swipe the same physical distance fast. If the pixel distances differ, acceleration is being applied somewhere in your stack.
Mouse Acceleration Test is a free, browser-based mouse testing tool that lets you detect Windows pointer acceleration or firmware-level sensor acceleration.
Mouse acceleration is a non-linear scale applied between the physical motion of your hand and the on-screen cursor. With acceleration off, moving your mouse 10 cm always produces the same pixel travel. With it on, a faster swipe produces more pixels than a slow swipe of the same physical distance. It was designed to help desktop navigation, but for aim-sensitive work (FPS games, aim training, precision drawing) it's a muscle-memory destroyer.
The test compares the pixel-per-inch rate of two swipes of the same physical distance — one slow, one fast. The math is dead simple:
Because you control the physical distance of both swipes, the ratio cancels out DPI, monitor resolution, and display scaling. It isolates the acceleration curve itself.
If acceleration is off but the same DPI still feels wrong after changing mice, use the same-DPI sensitivity troubleshooting guide to check real DPI variance, raw input, eDPI, polling rate, mousepad friction, and grip before blaming the game.
Competitive FPS relies on muscle memory — your brain learns that "this much hand motion = this much crosshair motion." Acceleration breaks that relationship because the crosshair now moves faster when your hand does. One-and-done flicks become guesswork. Every major CS2, Valorant, Apex, and Overwatch pro plays without mouse acceleration. If your ratio is over 1.15 here, turn it off before any aim-training session.
Mouse Acceleration Test FAQ
