Chess Tournament Tools
FIDE ELO & Performance Calculator
Free Swiss Pairing Generator
FIDE ELO Progression Calculator
USCF Rating Calculator
Free chess tournament tools including FIDE ELO and performance calculators, Swiss pairing generators, ELO progression projections and USCF rating calculators. Designed for tournament players, coaches, organizers and clubs.
ELO & FIDE Performance Calculator
Calculate FIDE ELO rating changes and
performance rating after a tournament. Enter
your initial rating, opponents and results to
estimate your new rating. Transparent match
breakdown and secure local storage.
Learn how FIDE Performance Rating works →
Swiss Pairings Generator
Generate first-round Swiss pairings instantly using a practical heuristic model. Designed for clubs, schools and rapid tournament setups. The Swiss pairing system (often called Swiss pairing rules) is a tournament format used in chess competitions.
ELO Progression Calculator
How many games will it take to reach your rating goal? Import your FIDE history for a personalized projection, or calculate manually. Three scenarios — your historical pace, optimistic and conservative — including automatic detection of FIDE K-factor thresholds.
USCF Rating Calculator
Calculate US Chess (USCF) rating changes after
tournament games. Enter your initial rating,
opponents and results to estimate your new
rating. Detailed game-by-game breakdown with
accurate expected score calculation.
Learn how USCF Rating System works →
Live Tournament Companion
Designed to be used during a real tournament
- Import a live tournament and view the current round pairings
- See real assignments when the next round is published — no prediction needed
- Simulate your game with Win / Draw / Loss to preview likely next opponents
- Track your tournament performance rating live, round by round
- Refresh in one tap to see results as games finish
Meet ChessFlow
Train what you actually play. On screen — or on your real board.
The chess training app from the creator of ChessTools: openings, middlegames and endgames.
The companion app for serious tournament players. Available now on iPhone & iPad.
Learn more about ChessFlow →
Chess Tournament Tools provides practical utilities for over-the-board players and tournament organizers, including a FIDE rating calculator, performance rating calculator, USCF rating calculator, Swiss pairing generator and live tournament tools. The project also includes ChessFlow, a dedicated chess training app for iPhone and iPad: openings, middlegames and endgames.
ChessTools was created to provide fast, practical tools for tournament players, coaches, organizers and clubs. Every calculator and pairing tool is designed to solve real problems during competitive events.
ChessFlow is the next step of the project: a dedicated chess training app that helps players prepare before the tournament by training openings, middlegames and endgames on screen or on a compatible electronic chessboard.
Together, ChessTools and ChessFlow support both sides of competitive chess: preparation before the event and practical tools during the tournament.