Chess-Maniac - The Automated Chess Rating Utility

Elo Calculator

Player's old rating:

Opponent's Rating	Score	Expected Score





Sum

K-value

Player's new rating:

\[Ea = {1 \over 1+10^{{Rb-Ra} \over 400}}\]

Ea	=	Expected Score Player A
Rb	=	Rating Player B
Ra	=	Rating Player A

\[R'a = {Ra + K(Sa - Ea)}\]

R'a	=	New Rating Player A
Ra	=	Old Rating Player A
K	=	K-Value
Sa	=	Player A Score
Ea	=	Expected Score Player A