Mouse test
Both tests run in your browser. Nothing is uploaded or stored.
Move the mouse quickly in circles inside the box. The value shows up after a second.
not enough movement yet
A browser can only measure the events it receives. Chrome and Edge deliver the raw values; other browsers are often capped at the monitor refresh rate and then show too little.
Put a ruler next to the mouse. Start the measurement, slide the mouse sideways over exactly the distance you entered, then click once or press Esc.
The result is a guide with a few percent of error, mostly from the ruler and the sensor itself. It reliably tells 800 from 1600 DPI, not whether it is exactly 800.
Many mice ship at 125 or 500 Hz until you set 1000 Hz in the software. And if a game suddenly feels different, check your DPI, which mouse software often changes quietly.
Once you know your DPI you can compare sens, mouse distance and eDPI across all games.