CPS KING

Mouse acceleration test: does a fast move go further?

Find out whether your pointer has acceleration. Move the mouse across the same distance slowly, then fast, first with raw movement and then the way your system moves the pointer. If fast sweeps go further than slow ones only the second way, Enhance pointer precision (Windows) or Pointer acceleration (Mac) is on. On a phone or tablet? This test needs a mouse: use a computer, or Chrome 144 or newer on Android with a mouse plugged in.

Put the mouse at the start mark, then press Start. The pointer hides until you press Esc.

Counts this sweep 0

Raw: slow 0 of 3, fast 0 of 3 · Your system: slow 0 of 3, fast 0 of 3

Raw movement: fast against slow–
Your system: fast against slow–

    No download, no account: it runs in your browser, Chromebooks included.

    How to do the test

    1. Lay a bank card (85.60 mm) or a ruler on your mouse pad, mark both ends with two strips of tape, and move the card away. A longer distance, such as 20 cm, gives a steadier answer.
    2. Press Start and put the left edge of the mouse on the first mark. For each sweep, hold still, press Space, move to the second mark, stop, and press Space again. Then bring the mouse back.
    3. Make 3 slow sweeps, taking about two seconds each, then 3 fast ones, as quick as you can while still stopping on the mark.
    4. Press Continue and make the same sweeps again. This time the browser gets the movement the way your system moves the pointer.

    Reading the result

    How exact is it?

    The test compares your sweeps with each other, so an exact length matters less than lining the mouse up the same way every time. A difference smaller than about twice the ± figure is not counted as acceleration. The speeds come from when the browser delivered the movement, not from the mouse itself. The test can't show the shape of your system's acceleration curve or tell you how a game handles the mouse.

    Which browsers can measure it

    Raw movement works in Chrome and Edge 88 or newer on Windows, macOS 10.15.1 or newer and ChromeOS, Chrome 144 or newer on Android with a mouse plugged in, Firefox 152 or newer and Safari 18.4 or newer on a Mac. In other browsers, Chrome on Linux among them, the test does only the second set of sweeps and says what that can't tell apart.

    To turn acceleration off, see mouse acceleration and Enhance pointer precision. To check your mouse's real DPI the same way, use the mouse DPI test.

    Sources: W3C, Pointer Lock 2.0; MDN, requestPointerLock and its browser support; web.dev, disable mouse acceleration; NIST, combining uncertainties.