Elo Rating Calculator

Calculate Elo rating changes after competition

Match Parameters

K-Factor

Match Result

Player A RatingWin Probability: 50.0%

Player B RatingWin Probability: 50.0%

Rating Changes

Player A15000

Player B15000

Ratings are recalculated based on the point swap logic. A total of 0 points were swapped between players in this simulation.

Overview

The Elo rating system calculates relative skill levels in zero-sum games. Originally designed for chess, it's now used in many competitive games and sports. The system adjusts ratings based on expected vs actual outcomes.

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Pro Tips

Higher K-factors mean ratings change more quickly—use K=40 for new players.
A rating difference of 200 points means the higher-rated player has about 76% win probability.
Draws result in small rating changes unless there's a large rating gap between players.

Fun Facts

"The Elo system was created by Arpad Elo, a physics professor and chess master."
"FIDE (World Chess Federation) uses K=20 for most rated games."
"Many video games use modified Elo systems for matchmaking."

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