// multi-utility computation suite · offline · instant · precise
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hobby.chess-elo-rating Calculator
Calculates expected score probability and Elo rating change after a game, using FIDE's standard K-factor table (K=40 for new players, K=20 for established, K=10 for 2400+). Understanding K-factor explains why beginners' ratings are volatile and grandmasters' ratings are stable.
Inputs
Player Rating
Reference formula or conversion factor shown for context.
Opponent Rating
Reference formula or conversion factor shown for context.
Result
Reference formula or conversion factor shown for context.
K Factor
A multiplier applied in the calculation.
Results
new rating
A standardised quality or risk rating on the applicable scale.
rating change
A standardised quality or risk rating on the applicable scale.
expected score
A numerical rating from the scoring model in use.
win probability
Sample size or count used in the calculation.
K-factor
A dimensionless multiplier applied in the calculation.