Chess Rating Calculators

After a tough over-the-board match, use the single-game Elo calculator to instantly determine your rating gain or loss. Simply enter your current rating, your opponent’s rating, and the match result to view your exact expected score and projected delta.

For coaches analyzing a match, the two-player update tool provides a complete view of how the game affected both sides simultaneously. For a fuller explanation of the rule behind it, read Learn the Elo basics.

When a single game isn't enough, switch to our tournament and batch calculators. The batch calculator allows you to process a series of consecutive games without losing track of your running rating. For implementation details and validation notes, review Review the methodology.

The tournament simulator takes it a step further by offering round-by-round tracking, calculating final rating movement, and providing an accurate performance rating based on the strength of your opposition across the entire event.

Unrated players entering the competitive scene can use the initial-rating estimator to calculate their first published rating based on current FIDE methodology, complete with minimum-score and threshold checks.

For club organizers and league captains, the team-event calculator streamlines roster management, board pairings, and match-level rating deltas into one comprehensive view.