Mouse DPI Test
Find your mouse's real DPI: hold the button down, move a measured distance along a ruler, let go. The page counts the movement and divides by the distance.
- Set OS pointer speed to default (Windows: 6/11) and turn off Enhance pointer precision.
- Lay a ruler next to your mouse and note the start position.
- Press and hold in the area below, move exactly the distance set, release.
Why measure DPI?
DPI (strictly CPI, counts per inch) decides how far the cursor or crosshair moves per inch of mouse travel. Manufacturers' settings are targets, and sensors commonly land a few percent above or below. If you are copying a pro player's settings or moving between mice, knowing the real value keeps your aim consistent. Feed the measured value into the eDPI calculator or the sensitivity converter.
Results look wrong? A value that changes with how fast you move means pointer acceleration is still on. A value off by exactly 1.25×, 1.5× or 2× usually means display scaling or a non-default pointer speed.
Questions
How do I check my mouse DPI?
Put a ruler on your desk, set Windows pointer speed to the middle notch (6/11) with Enhance pointer precision turned off, then press and hold on the test area and move the mouse exactly the distance you entered in a straight line. DPI = counts moved ÷ inches moved.
Why do I need to turn off pointer acceleration?
With acceleration (Enhance pointer precision on Windows, or the default curve on macOS) the cursor moves further when you move faster, so the count no longer matches the physical distance and the result is meaningless.
How accurate is an online DPI test?
With a ruler and a careful straight movement, typically within about 5%. Repeat it three times and average. Real mice often differ from their advertised DPI by a few percent, which is normal.
Does display scaling affect it?
The test multiplies by your device pixel ratio to undo display scaling. If you use a non-default pointer speed, results scale with it, so stick to the middle notch.