Sports & Motion Analytics
Intermediate

Elo Rating Update

Updates a player's rating after a game based on result versus expectation.

Formula

R′=R+K(S−E)R' = R + K(S - E)

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Variables

R'New rating
ROld rating
KK-factor
SScore (1 win, 0 loss)
EExpected score

Example

R=1600, K=32, win vs expected 0.75: R' = 1600+32(0.25)=1608

Did You Know?

Arpad Elo designed the system for chess in the 1960s; it now rates footballers, video-game players and even universities.

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