Elo Rating Change Calculator

This section will calculate the change in a player's Elo rating after playing a single game against another player. The value K is the maximum change in rating.

Player Elo:
Against Elo:
K factor:

Win	Draw	Loss

Expected Percentage:

K _val – K is the development coefficient.
K is the development coefficient.
K = 40 for a player new to the rating list until he has completed events with at least 30 games
K = 20 as long as a player’s rating remains under 2400.
K = 10 once a player’s published rating has reached 2400 and remains at that level subsequently, even if the rating drops below 2400.
K = 40 for all players until their 18th birthday, as long as their rating remains under 2300.

K = 20 for RAPID and BLITZ ratings all players.

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