Mouse lab
Mouse DPI estimator
Estimate a browser-scale value from measured physical travel and horizontal CSS-pixel displacement.
How to use this check
Start, then use a physical mouse inside the outlined area. Button numbers follow the browser mapping. Touch input is not counted as mouse input.
What the browser measures
Move horizontally over the physical distance you measured. Keep the pointer inside the area. The estimate uses CSS-pixel displacement and is affected by scaling and acceleration.
Reading the result
Measure a straight 2 cm movement and enter 2 before starting. If the browser reports 80 CSS pixels, the estimate is 101.6 per inch. Scaling, acceleration, pointer clipping and curved travel prevent this from certifying sensor DPI.
Why results can differ
A browser observes events exposed by your operating system. One test cannot establish whether a device is faulty. Connection, settings, focus and browser behavior can change the results.