Mouse & Scroll Test
    Input · Mouse DPI

    Mouse DPI test

    Move your mouse a measured distance along a ruler. We count the movement reports it sends and work out its real DPI.

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    About the mouse dpi test

    Updated

    DPI (or CPI) is how many movement counts a mouse reports for each inch it travels. This test locks the pointer, adds up the raw horizontal and vertical counts while you move the mouse a distance you set in inches or centimetres, and divides the counts by the distance. In Chrome and Edge it asks for unadjusted movement, which skips the operating system's pointer speed and acceleration; elsewhere it uses standard pointer lock and says so. Each run is listed with the average and the nearest common DPI setting.

    How to use it

    1. Place a ruler on your desk and set the distance you will move, for example 2 inches or 5 cm.
    2. Line the mouse up with the start mark and click Start run.
    3. Move the mouse exactly the set distance in a straight line, then click or press Space to finish. Press Escape to cancel.
    4. Repeat a few times and read the average and the nearest DPI setting.

    Frequently asked questions

    Why is my result a little off the DPI I set?

    Small measuring errors add up: 1 mm over 2 inches is about 2%. Mouse sensors also rarely hit their rated DPI exactly, so a few percent either way is normal. Average several runs over a longer distance for a steadier number.

    Does mouse acceleration affect the result?

    It can. In Chrome and Edge the test requests raw, unadjusted movement, which bypasses acceleration. If the page shows standard pointer lock instead, turn off settings such as Windows Enhance pointer precision before testing.

    Can I test DPI on a phone or tablet?

    No. The test needs a mouse and pointer lock, which touch screens don't provide. Open it on a computer with the mouse plugged in.