What This Site Does
The PSA Method Calculator is a browser-based tool for tuning mouse sensitivity through a repeatable set of choices. You enter your current in-game sensitivity, compare a lower and higher option each round, and finish with a narrowed-down value that is based on how you actually aim rather than on guesswork.
Why PSA
PSA stands for Perfect Sensitivity Approximation. The method starts with a wide range around your current setting, then uses binary choices to move toward the option that feels more controlled in practice. This makes it more personal than copying another player's settings or relying only on a fixed sensitivity formula.
Who It Is For
The tool is built for FPS players who want a simple way to test sensitivity for games such as Valorant, CS2, Apex Legends, Overwatch 2, Rainbow Six Siege, Fortnite, PUBG, and Call of Duty. It can also help aim trainer users compare settings before moving them into a live match.
How the Test Works
Each round gives you a lower and higher sensitivity value around the current base. After you choose the option that feels better, the calculator updates the base value and narrows the next pair. After 7 rounds, the final result is a practical recommendation you can try in your game and fine-tune if needed.
Why It Can Be Better Than Guessing
Many players change sensitivity too quickly or copy settings without knowing whether those settings fit their desk space, mouse grip, aiming style, or game pace. PSA gives you a consistent comparison process, so each choice has context and the final number is easier to trust.
Privacy and Local Use
The calculator runs in your browser and does not require an account, payment, or signup. The sensitivity value you type is used on the page to calculate the next round. The site is designed to be lightweight so you can open it quickly while practicing or setting up a new game profile.
How It Is Built
psamethod.com is maintained as a free web tool with English and Simplified Chinese pages. The goal is to keep the calculator clear, fast, and easy to use on desktop or mobile, while adding supporting guides for players who want to understand the PSA method more deeply.