DPI (dots per inch) is a mouse sensor parameter. It shows how many separate movement signals the sensor sends to the computer when the mouse travels one inch (about 2.54 cm). At 800 DPI the mouse reports 800 "steps" for every inch of movement, and at 1600 DPI twice as many, so the cursor or crosshair moves roughly twice as far.
DPI and sensitivity are not the same thing
Beginners often confuse DPI with in-game sensitivity (sens). These are two different settings:
- DPI is set at the level of the mouse itself, in its driver or manufacturer software, and applies across the whole system.
- Sensitivity is a setting inside a specific game that additionally multiplies the crosshair speed.
The actual crosshair turning speed is determined by the product of the two values. That is why players compare settings not by a single number but by the resulting value, often called eDPI: DPI multiplied by in-game sens. The same result can be reached with different combinations: for example, twice the DPI with half the sens gives the same crosshair speed.
Which values are used
In first-person shooters such as CS2, players usually choose a moderate DPI, typically 400 or 800, and adjust crosshair speed inside the game. Low and medium DPI allow wide, sweeping mouse movements, which helps with more precise aiming and recoil control. Values that are too high make the crosshair "jittery": the slightest hand tremor visibly shifts it.
There is no universal "correct" DPI. The choice depends on mousepad size, grip, habits, and playstyle: some players are more comfortable using their whole arm on a large mousepad, others using just their wrist.
Practical notes
- Change your DPI gradually and give yourself time to get used to it: muscle memory does not readjust in a single evening.
- Many mice let you switch DPI with a button on the body. It is important to know which value is currently active, otherwise the crosshair will behave unfamiliarly.
- A high DPI on a mouse's spec sheet is a marketing figure, not a measure of quality. What matters far more is how consistently the sensor tracks movement without stuttering or acceleration.
- If you switch to a new mouse, first set your previous DPI and your usual sens so that the crosshair feels the same.
Where the term comes from
The abbreviation comes from computer peripherals and was originally used to describe resolution in printing and scanning: dots per inch. For mice, the closely related term CPI (counts per inch) is also used; it is technically more accurate, but in everyday speech players almost always say "DPI." Today the word is part of the basic vocabulary of anyone who customizes gaming hardware to their own needs.