Mouse DPI Test

A mouse DPI test measures how many counts your mouse actually reports over a known physical distance — its real DPI, as opposed to the number the driver software claims. The tester below reads raw movement counts in your browser; nothing is uploaded.

Put a ruler or two credit cards (8.56 cm each) beside your mousepad. Click start, then move your mouse in a straight line for exactly that distance. Press Esc or click finish.

Why real DPI differs from configured DPI

DPI (counts per inch) is set in the mouse's driver, but the sensor executes it with small manufacturing tolerances — and many mice round, interpolate, or apply smoothing at certain steps. Measured deviations of 2–5% are normal; anything above ~8% means your cm/360 is not what calculators predict, because every sensitivity calculation assumes the configured DPI is true.

How to get an accurate reading

Run the test three times and average the results. Move in one smooth straight motion — hesitation adds micro-corrections that inflate counts. 15–30 cm is the sweet spot: long enough to average out sensor noise, short enough to stay accurate against a ruler. Two credit cards side by side are exactly 17.1 cm if you do not have a ruler.

What to do with the number

If your measured DPI is within a few percent, change nothing. If it is off badly, correct the configured DPI until the measured value matches your intended one — then your sensitivity conversions on SensLib will be physically exact.

Related tools

Sensitivity Converter
Exact yaw-based conversion
eDPI Calculator
DPI × sensitivity, instantly
What is cm/360?
The physical measure of aim feel