How is ELO rating change calculated in chess?

Rating change = K × (Score − Expected Score). Expected Score = 1 / (1 + 10^((opponent rating − your rating) / 400)). FIDE uses K=40 for new players, K=20 for established players, and K=10 for grandmasters. Beating a 200-point higher-rated player earns approximately 16–18 rating points.

What is the FIDE K-factor and how does it affect rating changes?

The K-factor determines how quickly your rating responds to results. K=40 (players below 2300 with fewer than 30 games) means large swings; K=10 (players above 2400) means stable ratings. Lichess uses K=40 for blitz and K=20 for classical regardless of rating.

Chess ELO Rating Change Calculator

Calculate ELO rating change after a chess game or tournament based on current rating, opponent rating, result, and K-factor. Supports FIDE, USCF, and Lichess rating systems.

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Frequently Asked Questions

How is ELO rating change calculated in chess?

What is the FIDE K-factor and how does it affect rating changes?