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LT ELO Calculator

This JavaScript Elo calculator program created by Lutz Tautenhahn from Germany (www.lutanho.net) lets you calculate your new rating after playing against to up to five Chess players. Just enter your current rating, K-value, your opponent’s ratings, game results (loss, draw, or win), and press the “Calculate” button.


Player's old rating:                   K-value (Master= 16 / Beginner= 32)  

Opponent's Rating Score Expected Score
                                              Sum   

Player's new rating:    

ExpectedScore=1/(1+10^((R_opponent-R_player)/400))
R_new=R_old+K*(Sum(Score)-Sum(ExpectedScore))

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