Elo Rating Calculator
Update Elo ratings based on match results and expected outcomes.
This Elo rating calculator is designed for soccer enthusiasts looking to calculate and track their performance. The calculator helps players understand their rating changes based on match results.
Calculator
Results
New Rating:
0
Data Source and Methodology
All calculations are based on the standard Elo rating change formula as used in various competitive sports. For more details, visit FIDE's Elo Rating System.
The Formula Explained
The formula used is: R_new = R_old + K * (S - E)
Glossary of Terms
- R_new: New rating after the match.
- R_old: Previous rating before the match.
- K: A constant factor (usually between 10 and 40).
- S: Actual score (1 for win, 0.5 for draw, 0 for loss).
- E: Expected score.
FAQs
How does the Elo rating system work?
The Elo rating system calculates the relative skill levels of players in zero-sum games such as chess and soccer.
What is the K-factor?
The K-factor is a constant that determines the maximum possible adjustment per game, typically a value between 10 and 40.
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
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Formula (extracted text)
The formula used is: R_new = R_old + K * (S - E)
Variables and units
- No variables provided in audit spec.
Sources (authoritative):
- FIDE's Elo Rating System — ratings.fide.com · Accessed 2026-01-19
https://ratings.fide.com/calc.phtml?page=change
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
- Initial audit spec draft generated from HTML extraction (review required).
- Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
- Confirm sources are authoritative and relevant to the calculator methodology.