Hardware Sensor Calibration

Mouse DPI Analyzer & True DPI Calculator

Calculate your true hardware DPI (Counts Per Inch) and sensor deviation percentage. Most mouse sensors differ by ±3-8% from advertised DPI specs due to lens height and mousepad friction.

📐 How to Measure Your True Hardware DPI (3 Simple Steps)

STEP 1

Config & Target Specs

Enter your mouse's software DPI (e.g. 800 DPI) and select a physical ruler drag distance (e.g. 2 inches or 5 cm).

STEP 2

Align Sensor at 0 Mark

Place a physical ruler next to your mousepad. Click "🔒 Start Hardware DPI Lock" and line up your sensor at the 0 mark.

STEP 3

Drag & Auto-Complete

Drag your mouse in a straight line along your ruler. The test automatically completes as soon as you reach the target distance!

0 DPI TRUE MEASURED DPI

Awaiting Measurement

Target Configured DPI 800 DPI

Sensor Deviation 0.0%

Raw Hardware Pulses 0

📏 Live Physical Ruler Drag Calibration Track Target: Drag 2.0 inches (1600 expected pulses)

Your Configured Mouse DPI:

Physical Ruler Drag Distance:

👉 Instructions: Click "🔒 Start Hardware DPI Lock", place your mouse at 0 mark on ruler, and drag horizontally 2 inches. Press ESC key when done!

What is DPI Deviation & Sensor CPI Calibration?

DPI (Dots Per Inch), technically called CPI (Counts Per Inch), measures how many pixels your cursor moves per physical inch of mouse movement.

❓ Why does my mouse have DPI deviation (+3% or -4%)?

Optical mouse sensors vary slightly due to lens height, skate thickness, and surface texture. A mouse set to 800 DPI might actually measure 825 DPI (+3.1% deviation). Calibration lets you adjust in-game sensitivity to maintain exact muscle memory.

❓ How does pointer lock measure unaccelerated raw counts?

The HTML5 Pointer Lock API bypasses screen edge boundaries and Windows OS pointer precision acceleration. It reads raw un-scaled hardware motion counts (movementX, movementY) directly from your mouse sensor.