# Mouse DPI Analyzer

> Free mouse DPI analyzer: measure your real mouse DPI in the browser with raw input, compare it to your set DPI, average several trials and check sensor accuracy.

Find your mouse's real DPI. Move the mouse a measured distance along a ruler and this analyzer counts the raw movement, divides by the distance and shows your true DPI. Run a few trials to average out errors, compare against the DPI set in your mouse software, and see how far off your sensor is.

- **Live tool:** https://www.toolnova.org/diagnostics-tools/mouse-dpi-analyzer
- **Category:** Speed Test & Diagnostics (https://www.toolnova.org/diagnostics-tools)
- **Price:** Free
- **Requirements:** Runs in a modern web browser · No signup · No install

## What this tool does

- Uses pointer lock with raw, unaccelerated input where the browser supports it.
- Measure in inches or centimetres over any distance from 1 to 20 inches.
- Live count and DPI estimate while you move.
- Averages up to 10 trials and shows the spread between them.
- Compares the measured DPI with the DPI set in your mouse software.
- Delete bad trials individually; nothing is uploaded.

## How to use Mouse DPI Analyzer

1. **Mark a distance** — Place a ruler on your desk and pick a distance, for example 4 inches or 10 cm.
2. **Start a trial** — Put the mouse at the start mark and click the pad to lock the pointer.
3. **Move exactly the distance** — Slide the mouse straight to the end mark without lifting it, then click or press Space.
4. **Repeat and read the average** — Do at least three trials. The average DPI and its deviation from your set DPI appear below.

## Common use cases

- Finding the DPI of a mouse with no software or unknown settings
- Checking whether a gaming mouse's DPI matches what it claims
- Measuring DPI before converting game sensitivity
- Comparing two mice for the same feel

## About

### How a DPI analyzer works

DPI (dots per inch, also called CPI) is how many movement counts a mouse sends for each inch it travels. If you move the mouse exactly 4 inches and the browser receives 3,200 counts, the mouse is running at 800 DPI. Pointer lock hides the cursor and delivers raw counts, and unadjusted movement asks the browser to skip operating-system acceleration, so the count reflects the sensor rather than your pointer settings.

### Why measured DPI differs from the box

Sensors are rarely exact. Deviations of a few percent are normal, and some mice run noticeably higher or lower than their rated steps. Small measuring errors matter too, so use a longer distance and several trials. If the result changes a lot between trials, check that you are moving in a straight horizontal line and not lifting the mouse.

| Deviation | Meaning |
| --- | --- |
| Within ±5% | Accurate sensor |
| 5 to 10% | Common for budget mice |
| Over 10% | Check setup, or the DPI setting differs from what you think |

See also: [Sensitivity Converter](https://www.toolnova.org/diagnostics-tools/sensitivity-converter), [Mouse Polling Rate Test](https://www.toolnova.org/diagnostics-tools/mouse-polling-rate-test), [Double Click Test](https://www.toolnova.org/diagnostics-tools/double-click-test)

## FAQ

### How do I check my mouse DPI?

Mark a distance with a ruler, click the pad here to lock the pointer, move the mouse exactly that distance and click again. The analyzer divides the counts by the distance to give your DPI. Repeat three times and use the average.

### Is an online DPI analyzer accurate?

It can be accurate to within a few percent if you measure carefully and the browser supports raw input. Longer distances and more trials reduce error.

### Why does Windows pointer speed affect the result?

If raw input isn't available, the browser receives movement after Windows applies pointer speed and acceleration. Set pointer speed to 6/11 and turn off Enhance pointer precision, or use Chrome or Edge, which support raw input.

### What is the difference between DPI and CPI?

They mean the same thing for mice: counts per inch of movement. DPI is the more common marketing term.

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