James Madison
Chess Elo Rating Calculator
by James Madison

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Page Sections:
Data Entry
New Ratings






Put in the ratings of the members of your chess team as shown in the initial example in the "Data Entry" section.  Each member must be given a rating with the "rates" verb before any game verb can be used for that person.  Start all new players with 1200 as a rating, per the Elo formula, and 0 as the game count.  The game verb "beats" determines who won and lost a game.  The game verb "draws" is used for a draw, and the order of names is not important.  As with any web site, minimize risk of data loss by typing your data into something more stable than a browser than pasting the content into this browser session!  Press the "Calculate" button to have your results appear in the "New Ratings" section.  Highlight and copy the results to paste them wherever you need them.  Use those results the next time around as the starting rating for your next wave of games.  The formula used is the standard Elo formula, including weighting for number of games.  The calculation is done with the public code available here.

Expand or contract section

Data Entry

    Paste in the current ratings of each player and the outcome of the new games to add to their ratings:



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Expand or contract section

New Ratings

    Ordered by rating:
      Sara  rates 1645 at 27 games
      Henry rates 1221 at  3 games
      Amy   rates 1197 at  4 games
      John  rates  837 at 18 games
      
    Ordered by name as originally provided:
      John  rates  837 at 18 games
      Sara  rates 1645 at 27 games
      Amy   rates 1197 at  4 games
      Henry rates 1221 at  3 games
      

    Notice these are in the same form as the input.  Use these as your starting ratings next time around, and add the new wave of games played.

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