Run the 7-step Perfect Sensitivity Approximation test to compare your in-game mouse sensitivity.
Enter your starting sensitivity, test each round in-game, and record your choices.
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Testing Method: Test these three sensitivity values on static targets at long, medium, and close distances in-game, then choose the one that feels most comfortable.
Calculated through 7 scientific iterations
Your iteration progress and history will appear here once you start the PSA calculation.
Follow the PSA method through seven rounds of lower, base, and higher sensitivity values.
Enter your starting sensitivity and compare each round on familiar in-game targets while keeping your DPI consistent.
Review your round history and copy the final sensitivity when the seven-round test is complete.
PSA stands for Perfect Sensitivity Approximation. The PSA method calculator guides you through seven rounds of mouse sensitivity comparisons. Your choices determine the next values to test, helping you settle on a setting that feels comfortable with your mousepad, grip, and play habits.
In each round, try the lower, base, and higher values on in-game targets, then choose the lower or higher option to continue. The calculator records your choices and gives you a final sensitivity after round seven. Keep your DPI and game settings consistent throughout the test so each comparison is useful.
Have a question about a PSA test step or your calculator result? Get help or share feedback on the tool.
PSA stands for Perfect Sensitivity Approximation. It is a binary-search method that runs 7 comparison rounds to find your ideal in-game mouse sensitivity. Each round presents three values; you pick the one that feels best, and the range narrows until it converges on a precise result.
Go into your game and find a sensitivity where one complete mousepad swipe (edge to edge) rotates your view exactly 360 degrees. Enter that value as your base. This gives the PSA algorithm a calibrated starting point independent of DPI or mousepad size.
PSA Calculator works with any FPS game that lets you adjust mouse sensitivity, including CS2, Valorant, Apex Legends, CSGO, Overwatch 2, Rainbow Six Siege, Call of Duty, and more. The output is an in-game sensitivity value relative to the game you used for calibration.
The 7-iteration process typically takes 10–20 minutes of in-game testing. Each iteration requires a short session on a practice range or aim trainer to compare three sensitivity values at long, medium, and close distances.
eDPI (effective DPI) is your mouse hardware DPI multiplied by your in-game sensitivity. For example, 800 DPI × 1.5 sens = 1200 eDPI. PSA outputs an in-game sensitivity number. After your test, multiply it by your DPI to get your eDPI, which lets you compare your setting with other players regardless of hardware differences.
Pro settings are a useful reference, but sensitivity is highly personal. It depends on your mousepad size, grip style, arm-vs-wrist ratio, and monitor resolution. PSA personalizes the result to your own feel rather than defaulting to someone else's setup. Use pro settings as a rough ballpark, then let PSA dial it in precisely.
Once you find your sensitivity, stick with it for at least 2–3 weeks to allow muscle memory to develop. Re-run PSA only if you significantly change your setup: new mousepad, different DPI, new monitor size or resolution, or a change in seating position.
Seven rounds of binary search narrow the starting range to less than 1% of its original width. In practice, the difference between adjacent values at that precision is imperceptible in normal gameplay, which means the algorithm has effectively found your true optimum. Fewer rounds leave too much uncertainty; more rounds offer no meaningful gain.