📈 USCF Rating Estimator
Estimate your new US Chess rating after an event — win expectancy, K-factor, bonus points, and performance rating, using the published rating formula.
1 Player
2 Opponents (up to 15 ratings)
Enter one rating per game played in this event. Leave the rest blank.
3 Options
4 Estimated Rating
—New Rating
—Rating Change
—Performance
—K Value
| Games counted | — |
| Sum of win expectancy (We) | — |
| Effective number of games (N) | — |
| Rating status | — |
| Base rating change (K × (S − We)) | — |
| Bonus points | — |
This is an unofficial estimate using the published US Chess rating formula (rating-dependent effective games N′, the 800/(N′+m) K-factor, and the B√m′ bonus provision for large over-performance, B=10). US Chess's actual computation also folds in opponent-repeat and streak adjustments this tool doesn't track, and is run centrally — results may differ slightly.