Calculate your estimated FIDE ELO rating change after a single game or tournament with this free online chess rating calculator.
This calculator uses the FIDE ELO rating calculation method. Enter your current rating, your opponent's rating, and the game result to see your expected score and calculated rating change. The official rating is finalised once tournament results are processed and published on the FIDE rating list.
For players without a FIDE rating, the tool uses games played against rated opponents, opponent ratings, and the total score achieved to provide a preliminary calculation of a possible initial rating. The official first rating is determined after FIDE's valid game and publication conditions are met.
Expected Score:
New Rating:
The K factor is the multiplier that determines the maximum rating change per game. In FIDE, K=40 applies to new players who have not yet completed 30 games, and to players under 18 with a rating below 2300. K=20 applies to players rated below 2400, and K=10 to players rated 2400 and above.
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ELO rating change is calculated using the player's current rating, the opponent's rating, expected score, actual game result, and K factor. The difference between the actual score and the expected score is multiplied by the K factor to determine the rating gained or lost from the game.
The K factor is the multiplier that determines the maximum effect a single game has on your rating. Under FIDE rules, K=40 applies to new players who have not yet completed 30 games and to players under 18 with a rating below 2300. K=20 applies to players rated below 2400, and K=10 to players rated 2400 and above.
For players without a FIDE rating, the initial rating is calculated using valid games played against rated opponents, the opponents' ratings, and the total score achieved. The tool shows the likely initial rating based on this data; the official first rating is determined after FIDE's applicable game count and publication conditions are met.
The tool performs a preliminary calculation using the FIDE ELO calculation method based on your rating, opponent rating, game result, and K factor. The rating change shown is based on mathematical rules; however, the official ELO score is finalised once tournament results are processed by the relevant federation and published on the FIDE rating list.