Rating Predictor

Estimate post-event rating movement before the tournament starts or after each round. This public tool supports both FIDE and US Chess style projections for informational and fun use only.

Public tool FIDE estimate US Chess estimate

Calculator

Federation

Current rating

K-factor override

K-factor controls how fast the rating moves after each game. A higher K-factor means bigger rating gains and losses, while a lower K-factor makes changes smaller and steadier. Leave this blank to use the tool's default for FIDE or US Chess.

Games

Add each opponent rating and result.

Projection summary

Predicted rating

1200

Games counted

Average opponent

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K-factor

Next game if win

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Next game if draw

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Next game if loss

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Federation

US Chess

This calculator uses the shown K-factor in the formula rating change = K × (actual score - expected score).

US Chess projection uses an Elo-style estimate for planning only. Official US Chess updates may differ because federation formulas and bonus rules are more detailed.

For information and fun only. Players should not use this tool to decide whether to play or skip a round. PairChamp does not encourage using rating predictions to make participation decisions.

Round-by-round detail

Add games, then calculate to see how each result changes the running rating.