Elo Rating Calculator

Calculate Elo rating changes and win probabilities for competitive games.

Match Parameters

Your Rating

Opponent Rating

Match Result

K-Factor

Higher K = larger rating changes. FIDE uses 10-40 based on rating.

New Rating

1520

+20 (Class C)

Win Probability

Win Chance36.0%

Lose Chance64.0%

Rating Changes

Expected Score36.0%

Your Change+20

Opponent Change-20

Elo Tiers

Grandmaster2400+

Master2200-2399

Expert2000-2199

Class A1800-1999

Class B1600-1799

Class C1400-1599