Who publishes this site and how to check our work
PSA Method is the site name used for these free tools and guides. This site is not an official service of the games discussed here. Publication under the site name does not imply a professional player, a research team or an endorsement by a game developer.
Tools and examples
The sensitivity calculator processes your choices in the browser. The calculation guide documents its exact multipliers, midpoint rule and display precision. Worked examples demonstrate arithmetic; they are not claims of player testing or improved performance.
Sources and historical data
The CS2 series discusses a May 2026 snapshot of 198 players from an external source. Each analysis links to the fixed report, aggregate and license, and explains which details cannot be independently checked from the public aggregate. It is not a live roster or a dataset collected by this website.
AI assistance and verification
AI tools have assisted with code and explanatory content in the October 2026 revisions. Arithmetic examples are checked against the implementation and browser tests check software behavior. Neither process substitutes for an in-game experiment, independent expert review or verification of unpublished source data.
Report a reproducible error
Use Contact for an incorrect claim, broken tool or unclear translation. Include the page URL and the sentence or steps involved. For calculation issues, add the starting value, choice sequence and expected result; for data issues, include the source version and denominator. Do not send passwords or private account information.
October 18, 2026: added a calculation reference and downloadable seven-round records; reorganized guide navigation. These changes concern tool transparency and usability, not measured gains in aiming performance.
Testing and corrections
The calculator has automated browser checks for calculation flows, undo, restoration, language changes, unavailable storage and mobile layout. These checks validate software behavior, not improvements in player performance. Worked examples are illustrations unless explicitly backed by a described test record. To report an error, use the Contact page and include the page URL, starting value, choices and expected result.
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.
What the Final Result Means
The final value is not a claim that there is one mathematically perfect sensitivity for every situation. It is a narrowed recommendation based on the choices you made in a controlled test. Treat it as a strong starting point, then use it for several practice sessions or matches before making very small adjustments.
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.
Editorial Approach
Supporting guides on psamethod.com are written to explain how to test settings, not to sell a preset or promise instant improvement. When pro-player data is discussed, it is used as context for common ranges and trade-offs. The site aims to separate repeatable testing advice from personal preference, hype, or isolated highlight clips.
Limits of the Method
Sensitivity is only one part of FPS performance. Crosshair placement, movement, reaction time, hardware latency, vision clarity, and practice quality all affect aim. PSA can help you stop fighting an obviously uncomfortable sensitivity, but it cannot replace training, warm-up routines, or reviewing mistakes in real matches.
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, Simplified Chinese, and Korean 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.