Chess Calculator

Professional chess rating and tournament calculations with transparent formulas

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FAQ

How is Elo calculated?

Using the formula E = 1/(1+10^(RD/400)) where RD is the rating difference.

What is TPR?

Tournament Performance Rating shows your effective rating for a specific tournament.

Disclaimer

This tool is for educational and training purposes only. Do not use any calculations or engine assistance during live competitive play. We are not responsible for any penalties resulting from misuse.

References

• FIDE Rating Regulations
• USCF Rating System
• Elo Rating System (Arpad Elo)
• Tournament Tiebreak Systems