Free mouse DPI test with a ruler — set distance, move horizontally between two clicks, and compare real vs rated DPI.
Click inside the left zone to start
Place a physical ruler horizontally on your mousepad, ensuring enough space for horizontal movement.
Align with the 0 mark, click the start zone. Keep the mouse horizontal — do not drift up or down.
This mouse DPI test online counts how many pixels your cursor travels over a ruler distance you measure on your desk — the same principle hardware reviewers use to check whether a sensor matches its rated 400, 800, or 1600 DPI spec. No install; runs in the browser.
Preferred by many FPS players. Lower DPI with large arm movements can improve aiming stability and predictable flicks on a wide mousepad.
Balances desktop use and gaming precision. Works well for MOBA, RTS, and most 1080p / 1440p setups without exhausting desk space.
Suited to 4K monitors, ultrawides, or multi-monitor workflows where you cross large pixel distances with smaller hand movements.
DPI is not magic — it is optical imaging plus digital scaling. This test compares how many on-screen pixels your cursor travels against a physical distance you measure with a ruler.
The math is transparent — no driver APIs, no hidden scaling. Each horizontal micro-movement during the drag is counted as physical distance traveled.
Σ |movementX| for every pointer event while measuring (includes small corrections if you overshoot). target distance in cm ÷ 2.54, or the target value directly when inch mode is selected. round(pixels moved ÷ inches traveled). (real DPI − rated DPI) ÷ rated DPI × 100. Disable mouse acceleration, lay a ruler on your pad, then follow three steps in the tool above — the same workflow people search for as “how to test DPI” or “mouse DPI test with ruler.”
Lay a physical ruler on your mousepad with room to move sideways. Align the mouse sensor with the zero mark before your first click.
A stiff ruler beats a flexible tape for consistent distance
Enter target distance (cm or inch) and rated DPI, then click inside the pink start zone. Keep the mouse level — avoid drifting up or down while you move.
Match the unit toggle to the marks on your ruler
Slide the mouse along the ruler until you reach the target distance (for example 3 cm), then click anywhere on the pad to finish. Real DPI and deviation appear in the results panel.
Repeat twice — small ruler alignment errors are normal
Verify low-DPI arm-aim setups or confirm a new gaming mouse matches advertised sensor specs before tuning in-game sensitivity.
Switch DPI for layout vs detail work and confirm each step on the mouse matches what you expect on canvas.
High-DPI mice on 4K or multi-monitor desks — check that cursor travel feels proportional before committing to a daily sensitivity.
Spot inaccurate factory DPI, acceleration quirks, or sensor skipping when a mouse feels faster or slower than its spec sheet.
DPI (dots per inch) is how many pixels your cursor moves per inch of physical mouse travel. Higher DPI means the pointer crosses more on-screen pixels for the same hand movement. It is set in mouse firmware or driver software — separate from in-game sensitivity, which is an extra software multiplier.
There is no single best DPI for everyone. Many FPS players use 400–800 with large mousepads; 800–1600 works well for 1080p and 1440p. Pick a DPI that lets you aim and flick comfortably, then tune in-game sensitivity. Use this mouse DPI test to confirm your hardware matches the rated setting before copying pro configs.
Open your mouse software (Logitech G Hub, Razer Synapse, etc.) or Windows mouse settings to see the active DPI step. Then run this DPI check with a ruler: enter that rated value, disable pointer acceleration, and compare real DPI to the profile. A large gap usually means the wrong profile is active or OS scaling is interfering.
Place a ruler on your mousepad, disable pointer acceleration in Windows, open this mouse DPI test online, set target distance and rated DPI, click the start zone, move the mouse exactly that distance along the ruler, then click again. The tool sums |movementX| during the drag (true distance traveled), locks the pointer so screen edges do not truncate counts, and computes real DPI = pixels moved ÷ inches traveled.
Use a browser-based DPI test with a physical ruler. This page locks the pointer during the drag so high-DPI mice do not run out of screen space, sums absolute horizontal movement per event, and divides by the ruler distance you enter. Keep OS sensitivity at 100% / 1.0 for the clearest hardware readout.
Your DPI is how many pixels the cursor moves per inch of physical mouse travel. Enter your mouse’s rated DPI, run the ruler test above, and compare Real DPI to the factory setting. ±5–10% is normal; larger gaps often mean acceleration or the wrong driver profile is active.
A DPI test measures cursor pixels per inch of mouse movement. Ruler-based tests — like this mouse DPI test tool — are more practical than moving exactly one inch on screen because they use a distance you can mark on a real ruler.
DPI is set in mouse firmware or driver software — it defines how the sensor counts movement. Sensitivity is an extra multiplier in the OS or game. For accurate hardware tests, keep OS sensitivity neutral (100% / 1.0) and disable pointer acceleration.
±5–10% is normal due to sensor height, lens tolerance, mousepad surface, and slight ruler error. Larger gaps often mean acceleration is on, a non-1.0 sensitivity slider is active, or the mouse profile DPI does not match what you entered.
Trackpads do not have a fixed DPI like optical mice — results are not meaningful for laptop pads. Use a dedicated mouse on a stable surface for this test.
There is no universal best DPI — pros often use 400–800 with large mousepads, while 800–1600 suits many 1080p/1440p players. Pick a DPI that lets you aim comfortably, then tune in-game sensitivity separately.
Once you have a verified DPI, convert it into CS2, Valorant, Apex, and other in-game sensitivity values with yaw-based math.
