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Mouse Tester

DPI Analyzer Tool

Physically-measured DPI/CPI accuracy against a real ruler.

Place a ruler on your desk. Click and hold here, then drag your mouse in a straight line along the ruler to your chosen distance, and release.
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This is a browser-observed estimate, not a lab reading of your sensor's raw hardware CPI. It compares counts reported by your browser against the physical distance you measure with a ruler. Move in one straight, steady line, don't chase the cursor, and average 3-5 runs for a reliable reading. Results can be affected by OS pointer speed, acceleration, and how precisely you follow the ruler.

About this tool

Instead of trusting whatever your mouse software reports, this tool measures your sensor's real-world CPI by counting actual reported movement while you drag along a physical ruler for a set distance, then computing counts-per-inch directly.

You set the configured DPI (for comparison), a ruler distance (1–8 inches), and a movement direction (horizontal, vertical, or auto), then drag in a straight line — the tool tallies movementX/Y deltas and divides by the physical distance to compute measured DPI, plus rounds to the nearest 50-step for a clean comparison figure. Results from up to five runs are logged and averaged, since single-run measurements are sensitive to hand steadiness.

Key features

  • Physical-ruler-based DPI/CPI measurement, not just a software-reported number
  • Configurable ruler distance (1–8 inches) and movement direction (horizontal/vertical/auto)
  • Run history of up to five measurements with automatic averaging
  • Nearest-50-step rounding for easy comparison against common DPI presets

Why use it

  • Know your mouse's true configured DPI instead of trusting software or box specs
  • Catch DPI misconfiguration after a software reset or driver reinstall
  • Get a reliable, averaged reading instead of a single noisy measurement

Why mouse testing testing matters

Mouse specs on the box are rarely what you actually get in practice. A mouse sold as "16000 DPI" is a sensor ceiling, not what it's configured to right now, and polling rate can silently fall back to 125Hz if a USB hub or driver misconfigures the connection. These tools measure what your system is actually reporting, not what the marketing says.

Tips for accurate results

  • For the DPI analyzer, use a real ruler and move in one slow, straight line — jerky or curved movement inflates the counted distance and skews the result.
  • Run polling rate and input lag tests with the mouse on the same surface and DPI setting you play on, since sensor behavior can shift with surface material.
  • For click speed tests, remember that sustained "CPS" over 10+ seconds is a more honest measurement than a 1-second burst.
  • If results seem inconsistent, check for OS-level mouse acceleration or pointer smoothing, which can distort raw sensor readings.

Frequently asked questions

Why is my measured DPI different from the box spec?

The box spec is the sensor's maximum capability. Your actual DPI depends on the setting configured in software (or via on-mouse buttons), which this tool measures directly against real-world distance.

What polling rate should I aim for?

125Hz is the USB default; gaming mice commonly run at 500Hz or 1000Hz for lower, more consistent input latency. Higher isn't always better if it destabilizes an older sensor.