🌍 FIDE Rating Estimator
Estimate your new FIDE Standard rating after an event — win expectancy, K-factor and performance rating, using the published FIDE rating formula.
1 Player
2 Opponents (up to 15 ratings)
Enter one rating per game played in this event / rating period. Leave the rest blank.
3 Estimated Rating
| Games counted | — |
| Sum of win expectancy (We) | — |
| K-factor tier | — |
This is an unofficial estimate of the FIDE Standard rating change (FIDE Handbook B.02, effective 1 March 2024): win expectancy with the 400-point cap (uncapped for players rated 2650+), and a K-factor of 20 for players rated below 2400 or 10 for players rated 2400+. This assumes an established player — FIDE's K=40 provisions for new players (<30 rated games) and juniors (under 18, rated below 2300) aren't modeled here. FIDE's actual computation is run centrally by rating period and may differ slightly. Rapid and Blitz ratings use separate pools and are not covered here.