True Hardware DPI & Sensitivity Calibrator.
Measure actual CPI (Counts Per Inch). Optical sensor lens height and mousepad thickness often cause a 5–15% DPI discrepancy compared to manufacturer labels.
To find your mouse's true hardware DPI without proprietary software, align your mouse against a physical guide (such as a 3-inch ruler or standard 3.370-inch credit card). Click and hold the calibration trigger below, slide the mouse smoothly across the physical distance, and release. True DPI (CPI) is calculated by dividing total raw hardware counts by physical inches moved: DPI = Raw Counts / Distance (inches).
1. Configure Test Parameters
Select your mouse's nominal DPI and the physical distance you will glide.
2. Physical Calibration Strip
Click and hold the ball, slide your physical mouse across your desk until the ball hits the Target Goalpost, then release.
Why Does DPI Deviation Occur?
DPI (Dots Per Inch) is determined by the distance between the optical sensor lens and the tracking surface. Thicker replacement mouse skates (e.g. glass skates, Tiger ICE, Corepad) or soft cloth mousepad sponge compression change this focal distance by 0.2mm–0.5mm, which changes your effective DPI by ±3% to 10%!
Best Practices For Measuring
Align the left side of your mouse flush against a hardcover book, phone, or credit card on your desk. Click and hold the target ball above, slide the mouse rightward until it touches the second marked object set at the chosen distance, and release.