How to Measure Your Mouse DPI
You need a ruler (or tape measure) and a clear patch of mousepad.
- Set the distance you’ll swipe. 10 cm works; 20 cm is more accurate.
- Lay the ruler beside the mouse and line up the mouse’s front edge with 0.
- Press Start swipe. The pointer is captured so it can’t hit the screen edge.
- Slide the mouse straight to the right until its front edge reaches your distance. Don’t lift it.
- Click to finish. Repeat two more times — the result is the average.
How the DPI Analyzer Works
A mouse sensor reports movement in counts. DPI (more precisely CPI, counts per inch) is simply how many counts it sends per inch of travel:
DPI = counts ÷ distance in inches
In Chrome and Edge, the test locks the pointer with raw input, so it receives the counts straight from the sensor before Windows applies pointer speed or acceleration. The Input box shows Raw when this is working. Other browsers only expose movement after the operating system has adjusted it, so the result depends on your OS settings.
Reading Your Results
- Measured DPI — the average over all your swipes.
- Likely setting — the nearest standard DPI step (400, 800, 1600…), which is probably what your mouse software is set to.
- Consistency — how much your swipes disagree. Under ±3% is a solid measurement.
Why Real DPI Differs from the Advertised Value
| Cause | Typical effect |
|---|---|
| Sensor tolerance | ±5–10% on many mice |
| Mousepad surface | Glossy or very soft pads can lower counts |
| Lift-off distance and feet wear | Sensor sits slightly higher, reads less |
| Angled swipe | A diagonal path measures fewer horizontal counts |
If you’re switching mice and want the same aim, measure both and adjust the new mouse’s DPI or in-game sensitivity to match. The eDPI calculator turns that into a sensitivity value for your game.
DPI vs Sensitivity vs eDPI
- DPI is set in the mouse (hardware).
- Sensitivity is set in the game or operating system (software multiplier).
- eDPI is DPI × in-game sensitivity — the number that actually describes how fast you turn. Two players with 400 DPI × 2.0 and 800 DPI × 1.0 have the same eDPI and the same feel.
A higher DPI isn’t “better” on its own. High DPI with low sensitivity can reduce pixel-skipping on large high-resolution screens, but very high settings (above ~3200) can add sensor smoothing on some mice.
Frequently Asked Questions
Why Is My Measured DPI Different from the Setting?
Sensors are rarely exact — a deviation of 5–10% from the advertised value is common, even on gaming mice. Mousepad texture, lift-off and sensor height also change the reading. That's why it's worth measuring if you want identical sensitivity across two mice.
What Is the Difference Between DPI and CPI?
CPI (counts per inch) is the technically correct term for mice; DPI (dots per inch) comes from printing. In practice both mean the same thing — how many movement counts the sensor reports per inch travelled.
Does Windows Pointer Speed Affect the Result?
Not in Chrome or Edge, where the test uses raw input and bypasses Windows pointer speed and "Enhance pointer precision". In other browsers it can, so set pointer speed to the 6th notch and turn acceleration off before measuring.
What DPI Do Pro Gamers Use?
Most competitive FPS players use 400, 800 or 1600 DPI and set lower in-game sensitivity. What matters for aiming is the combination of the two, called eDPI, rather than DPI alone.
How Many Swipes Should I Do?
At least three. The consistency figure shows how much your swipes vary; below ±3% means your average is reliable. If it's higher, use a longer distance like 20 cm and keep the mouse straight.
Related Tests
- eDPI CalculatorCombine your mouse DPI and in-game sensitivity into one comparable number, and see how far you move to turn 360°.
- Mouse Polling Rate TestMove your mouse and see how many times per second it reports to your computer — from 125 Hz office mice to 8000 Hz gaming sensors.
- CPS Test – Clicks per SecondClick as fast as you can and see your clicks per second. The timer starts on your first click.
- Mouse Double-Click TestSingle-click normally and see whether any press registers twice — the classic sign of a worn mouse switch.
- Mouse Button TestClick every button and roll the wheel to confirm each one registers — including the side buttons most tests miss.
Last updated · Part of our mouse tests.