Estimate your Elo rating change after rated chess games using the FIDE Elo formula.
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How This Works
Elo expected score: E = 1 / (1 + 10^((opponent − your rating) / 400)). Rating change = K × (actual score − expected score). Win = 1.0, draw = 0.5, loss = 0.0. K-factor scales the maximum rating change per game — 40 for new players, 20 for established, 10 for grandmasters above 2400.
Elo is a relative ranking system — your rating only changes based on results against other rated players. Beating a much higher-rated player gains many points; losing to them loses few. The system assumes player strength is normally distributed. Online platforms like Chess.com and Lichess use modified versions with faster K-factors for quicker rating convergence.