Measure · repeat · compare
Mouse DPI tester and sensitivity analyzer
Measure a ruler-guided mouse movement, compare repeat runs, and tune your sensitivity.
A measurement, not a firmware reading. This tool estimates DPI from movement reported by your browser. A difference from your mouse software is not a sensor fault or an accuracy score.
1 Set your ruler distance
Mark two points on your desk. Measure how far the same point on the mouse will travel, not the width of the mousepad.
Before you measure
- Use an external mouse and a physical ruler. Touchscreens cannot measure mouse DPI; touchpads are unsuitable.
- Keep your mouse profile, surface, speed and browser zoom fixed across runs.
- For standard or drag input, turn off pointer acceleration and use your normal default pointer speed. Start at 100% browser zoom.
- Move steadily to the physical end mark. The onscreen guide is not a ruler. Do not lift, rotate or return the mouse before finishing.
2 Make one straight stroke
Prepare the test, align your mouse with the physical start mark, then click the tracking area to begin.
Ready when you areA physical mouse and ruler are required.
While locked: click or press Enter to start and finish. Escape cancels without saving.
Loading analyzer…
Latest completed estimate—No completed run
Current axis movement0Browser movement units
Difference from configured—Comparison, not an accuracy grade
Move the full entered distance even if the display passes an expected value. There is no automatic stop.
Repeat at least three times
3 Compare your runs
Median estimate—
Mean estimate—
Run range—
Repeatability spread (CV)—
Complete three runs with the same settings. Repeatability describes consistency, not hardware accuracy.
| Run | Estimate | Distance / direction | Input | Notes | Action |
|---|---|---|---|---|---|
| No measurements yet. Results stay in this tab until you clear or reload it. | |||||
The summary uses the newest matching group: same input mode, horizontal/vertical axis, distance, configured DPI and display conditions. Other runs remain in the table. Changing your mouse profile or OS settings? Clear history first.
How the estimate works and what it cannot tell you
Estimate = net movement along the selected axis ÷ physical travel in inches. Sideways drift and return movement are not added to inflate the result. The run is discarded if input is interrupted, the pointer reaches the viewport edge in drag mode, or the stroke reverses substantially.
Unadjusted mode requests unadjustedMovement. An accepted modern API request is labeled separately from standard or unconfirmed legacy lock. It does not read your firmware or certify sensor accuracy. Drag mode uses CSS coordinates and is affected by pointer settings, zoom and display scaling. We do not apply an assumed device-pixel-ratio correction.
The ruler distance and your hand movement remain sources of error in every mode. These results cannot diagnose sensor health, angle snapping, lift-off distance or USB polling rate. For gaming calculations, prefer the configured DPI from your mouse utility unless you have established a reliable measurement.
Measurement samples are processed in this tab, without storage or uploads by this analyzer. CSV is generated only when you click Export. The website's normal ads, consent and analytics are governed by its privacy policy.
Compare sensitivity in the same game
eDPI combines your mouse DPI and your in-game sensitivity. Compare it only within the same game and sensitivity mode.
Use the sensitivity value displayed by your game. Games use different scales; equal eDPI does not mean equal aim across games.
eDPI = mouse DPI × sensitivity
800 DPI × 1.5 sensitivity
400 DPI × 3 and 800 DPI × 1.5 both give 1,200 eDPI within the same game.
Open the full eDPI calculator →Change mouse DPI, preserve the sensitivity product
For the same game and sensitivity mode, choose a new mouse DPI and calculate the matching sensitivity.
Matching new sensitivity
(800 × 1.5) ÷ 1,600
Apply your new DPI in the mouse utility, then enter this sensitivity in the same game and test the feel. Rounding, acceleration, ADS and separate sensitivity multipliers can change the result.
This does not convert between different games. A cross-game conversion needs the game's input scale and other settings.
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Mouse DPI tester guide
How to run an accurate mouse DPI test online
Use this DPI tester to check real mouse DPI, compare it with your configured DPI, and decide whether your mouse sensitivity or eDPI needs adjustment for gaming, office work, or high-resolution screens.
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eDPI calculator
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Input latency test
Quick DPI ranges: competitive FPS players often use 400-800 DPI, everyday work commonly feels comfortable around 800-1600 DPI, and 4K or multi-monitor setups may need 1600-2400 DPI. The best setting is the one you can repeat accurately.
If the same DPI feels different: read the same-DPI sensitivity troubleshooting guide after measuring. It explains how real DPI variance, Windows pointer speed, raw input, eDPI, polling rate, mousepad friction, and grip can change the feel.
If you are changing DPI on purpose: use the DPI conversion workflow for keeping aim consistent before you move the game sensitivity slider.
Want the sensor background? The ball, optical, and laser mouse explainer shows how the sensor produces the counts that this DPI tester measures.
Buying a travel mouse: the Dell MS700 Bluetooth travel mouse comparison explains why advertised DPI ranges still need a quick real-world DPI check after pairing.
Once the DPI number is confirmed: see what a good ms-per-target score looks like — the benchmark table gives average, good and elite time-per-target bands with the matching hit-% and pixel-error figures at 800 DPI, so you can tell whether the setting you just measured is actually working.
DPI test FAQ
Common mouse DPI checker questions
