How does the US Chess rating calculator work?

This calculator implements the official US Chess (USCF) rating algorithm as defined by Mark E. Glickman and Thomas Doan. It calculates your new rating based on your pre-event rating, number of prior games, and tournament results against opponents.

Is this calculator accurate?

Yes, this calculator uses the official USCF Regular (OTBR) rating algorithm with two-pass calculation. However, this is an unofficial tool for estimation purposes only. Official ratings are calculated by US Chess.

What information do I need to calculate my chess rating?

You need your pre-event rating, number of prior games, and for each tournament game: your opponent's rating, their number of prior games, and your result (win/draw/loss).

🏆 US Chess Rating Calculator

Calculate your new USCF rating based on tournament results

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Player Information

Check only if player is unrated

Pre-Event Rating

Estimate of games played before

Check only if all prior games were wins Check only if all prior games were losses

Tournament Games

Add each game from the tournament. Enter the opponent's pre-event rating, their number of prior games (N), and your result.

Rating Calculation Results

Old Rating

New Rating

Rating Change

Standard

Formula Used

Calculation Details

Games Played in Event -

Actual Score -

Expected Score -

Effective Games (N') -

K-Factor -

Bonus Points -

Precise New Rating -