Place a ruler
Lay a ruler along the pad so the mouse has enough room for a straight horizontal move.
DPI sensitivity test
Click the left start area to begin measuring
Target distanceRated DPI
Precise DPI calibration
Click the left start area to begin measuring
Place a real ruler next to the pad, start from the left zone, then move horizontally to the target distance and click again to finish.
Start zone
Set the start point
Align with the left start zone, click once, then begin moving while keeping the mouse level.
Reach the finish point
Move to the target distance and click again. The estimate is recalculated from this run.
Understanding DPI
DPI / CPI describes how much on-screen travel you get from one inch of physical mouse movement. This page is best used for browser-side estimates and relative comparison, not as a lab-grade hardware truth tool.
400 - 800
A classic range for many FPS players who want steadier aim and larger arm-driven control.
800 - 1600
A practical middle ground for daily desktop use, MOBAs, RTS titles, and most 1080P or 1440P setups.
3200+
Useful for 4K, multi-monitor, or efficiency-first setups, though it can also magnify tiny hand tremors.
How to get a cleaner estimate
This page combines browser-visible pixel displacement with the real physical distance you enter manually, so test posture and system settings matter a lot.
Disable mouse acceleration first
If pointer acceleration is still enabled, cursor travel changes with movement speed and the estimate becomes unreliable.
Use a longer, straighter move
A smooth straight motion over at least 10 cm is usually more reliable than a short, shaky swipe.
Keep the pad and DPI step fixed
Surface texture, pad material, and firmware steps all affect the result, so comparisons need a stable environment.
Treat it as comparison, not truth
This page is great for checking whether presets broadly line up or whether one mode feels off, but not for replacing dedicated hardware tools.
Why the result can drift
The browser only sees processed system-side cursor movement rather than raw sensor counts, so a moderate amount of error is expected. Roughly ±5% to ±10% is not unusual.
The easiest setting to miss on Windows
Turn off Enhance Pointer Precision before testing. If acceleration stays on, web-based DPI checks become heavily distorted.
Technical background
DPI is not magic. It comes from sensor imaging, lens behavior, surface tracking, and signal processing working together.
CMOS imaging and displacement
Modern optical sensors sample the surface at high speed, compare frame-to-frame texture changes, and turn those differences into X / Y counts.
Matching DPI to resolution
The same DPI can feel very different on 1080P, 4K, or multi-monitor setups because the desktop area and pixel density change the final feel.
Common use cases
The right DPI depends on what kind of control you want to optimize.
FPS competition
Lower DPI plus a large pad often helps with steadier micro-adjustments and recoil control.
Design work
Higher sensitivity helps broad movement, while lower sensitivity helps detail work and fine edits.
Efficient desktop work
Higher DPI can feel faster and more convenient across larger desktops or multiple displays.
Hardware validation
Useful for checking whether presets broadly behave as expected or whether one mode feels obviously off.
FAQ
These two questions explain most of the confusion people have when they first test DPI on the web.
Q.
What is the difference between DPI and sensitivity?
DPI / CPI is closer to a hardware base step, while sensitivity is a software multiplier in the OS or game. Both combine to create the final cursor speed.
Q.
Why does the estimate differ from the advertised number?
Pad material, lift height, lens tolerance, acceleration settings, browser behavior, and manual measuring error can all affect the result. Web tools are best for trend reading and rough validation.
Practical DPI tips
If you are tuning feel rather than chasing one headline number, these habits usually help more.
Start with common native steps like 400, 800, or 1600 before going much higher.
In games, eDPI matters too: DPI multiplied by in-game sensitivity often maps better to real feel.
Retest after changing to a very different pad material, especially cloth to glass or hard pad.
Unless you truly need it, there is rarely a strong reason to push far past 3200 for general use.