Elo Rating Calculator

Summary

Enter two player ratings, pick a K-factor, choose the match result, and instantly see the updated Elo ratings.

How it works

1. Enter the current Elo rating for Player A (the higher-rated or lower-rated player — order does not matter).
2. Enter the current Elo rating for Player B.
3. Select the K-factor that applies to your rating pool (e.g. 16 for masters, 32 for beginners, 40 for new players).
4. Choose the match result: Player A wins, Player B wins, or Draw.
5. Click Calculate to see each player's expected score and updated Elo rating.
6. Use the Reset button to start over with new values.

Use cases

• Calculate updated chess ratings after a tournament game.
• Track Elo progression for table tennis or badminton club leagues.
• Simulate rating changes before a high-stakes match.
• Understand how upsets affect ratings more than expected wins.
• Compute Elo changes for online gaming ladder systems.
• Verify manual rating calculations from official scoresheets.
• Teach the Elo concept to students or new club members.
• Compare how different K-factors affect post-game rating swings.

Frequently Asked Questions