// multi-utility computation suite · offline · instant · precise
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sport.chess-elo-probability Calculator
Calculates the expected win probability for a chess player against a rated opponent using the Elo formula, and shows the expected rating change from a win, draw, or loss. Used to decide whether a match is a good or risky rating bet.
Inputs
Player Rating
Reference formula or conversion factor shown for context.
Opponent Rating
Reference formula or conversion factor shown for context.
Tournament Games
Reference formula or conversion factor shown for context.
Results
win probability
Sample size or count used in the calculation.
opponent win probability
Sample size or count used in the calculation.
expected score in
A numerical rating from the scoring model in use.
rating difference
The arithmetic difference between the two values.
Ea = 1/(1+10^((Rb-Ra)/400))
Reference formula or conversion factor shown for context.
draw
Reference formula or conversion factor shown for context.