The rating calculations provided by this tool are based on the published English Chess Federation rating formulas and are intended to be used for estimation purposes only.

Actual official ECF ratings may differ due to several factors:

• Special rating adjustments applied by the ECF
• Rounding differences in calculation methods
• Tournament-specific rules or exceptions
• Recent changes to the rating formula not yet reflected in this tool
• K-factor differences for different player categories
• Established vs. new player rating calculations

Important note: ECF ratings are calculated after each graded event, and this estimator may not perfectly match the official ECF calculation method for all scenarios.

For official ratings, always refer to the English Chess Federation's official website and publications. This tool does not replace official ratings issued by the ECF.

The developers of this tool make no guarantees about the accuracy of these estimates and are not affiliated with or endorsed by the English Chess Federation.