What Is the PSA Method in FPS Games?

In FPS aim settings, PSA usually means Perfect Sensitivity Approximation. It is a structured way to compare a lower sensitivity against a higher sensitivity, then keep narrowing the range until you find a practical baseline.

This guide is about mouse sensitivity in games. It is not a medical PSA calculator or a prostate test tool.

Raw sensitivity numbers do not transfer cleanly between games, DPI settings, mousepads, or aiming styles. Copying a pro Valorant or CS2 setting can be a useful reference, but it does not know your desk space, grip, crosshair control, or comfort range.

The PSA Method works better because you only answer one simple question each round: does lower, higher, or current feel easier to control? That keeps the test practical while still narrowing the range.

Start with your current sensitivity as the center. The calculator tests a lower value and a higher value around it. If lower feels better, the lower value becomes the new center. If higher feels better, the higher value becomes the new center. If current feels best, you can stop early.

Each round cuts the step size down, so the choices become more precise. Seven rounds is a good default; five is faster, and ten is better if your answers keep changing.

A Valorant player at 800 DPI and 0.40 sensitivity starts with 320 eDPI. The first round might compare 0.20 vs 0.60. After choosing the side that feels easier to stop on target, the next round tests a smaller range around the new center.

The final result is not a magic best sensitivity. It is a strong starting point to use in deathmatch, the practice range, or your normal warmup routine.

Do not choose the value that only feels faster. Choose the value that feels easier to control. Keep the same test routine each round, avoid changing DPI mid-test, and do not judge a sensitivity from one lucky flick.

If the result feels close but not perfect, restart with the final sensitivity and run a shorter follow-up test.