Chess Elo calculator for one game or a tournament
Choose FIDE Standard, Rapid, Blitz or Continuous Elo before entering the ratings. FIDE modes use the exact published PD table, the correct pool rules, an effective K-factor and one final rating-period round.
Single game rating change
Exact FIDE PD table or continuous 400-point curve
+2.80
single-game contribution36.0%expected score
After-game scenario: 1502.80
FIDE PD table 8.1.2 · Standard listRating difference 100 → PD 0.3620 × (0.5 − 0.36) = +2.80
This is the unrounded contribution from one rated game. FIDE rounds the summed change for the full rating period, not each game.
Tournament or rating period
For an official FIDE total, include every rated game from this list in the period
FIDE Standard: 1 rated game. Base K 20; effective K 20. The raw +2.80 period change rounds to +3.
| Opponent | Result | Expected | Contribution | Remove |
|---|---|---|---|---|
| 36.0% | +2.80 |
Period change: +3 · New rating: 1503
FAQ on Chess Elo Calculator
Exact FIDE table, pool rules and rating-period rounding.
How is a FIDE rating change calculated?
For each rated game, this calculator takes PD from FIDE's published table after applying the selected pool's rating-difference rule. It sums score minus PD, multiplies by the effective K-factor and rounds the rating-period change to the nearest whole number, with 0.5 rounded away from zero. Continuous mode instead uses the logistic Elo curve and keeps decimals.
What is the K-factor in FIDE chess?
FIDE uses K=40 for a player new to the list until they have completed events with at least 30 games, K=20 while the rating remains below 2400, and K=10 after a published rating reaches 2400. K=40 also applies through the end of the year of a player's 18th birthday while the rating remains below 2300.
What score should I enter for a draw?
Enter 0.5 for a draw, 1 for a win and 0 for a loss.
Can I calculate a whole tournament or rating period?
Yes. Add every rated opponent and result as a row. In a FIDE mode, the calculator uses the same starting rating for every row, applies one effective K-factor and rounds the summed period change once.
How does the FIDE K times games limit work?
If the base K multiplied by the number of rated games exceeds 700, the calculator uses the greatest whole-number K for which K multiplied by the rated-game count does not exceed 700. Games excluded by the Rapid or Blitz 600-point rule are not counted.
Does the calculator round every game?
No. FIDE game contributions remain unrounded. Only the summed rating-period change is rounded to the nearest whole number, with 0.5 rounded away from zero. Continuous mode keeps its decimal total.
How do the FIDE Standard, Rapid and Blitz rules differ?
They use separate rating lists. Under the current Standard regulations, a difference over 400 is capped only when the player being calculated is below 2650; a player at 2650 or above uses the actual difference. Rapid and Blitz cap differences over 400 for every player, and a game with a difference of at least 600 is not rated when either player is above 2600 on the relevant list.
Are FIDE classical, rapid and blitz ratings interchangeable?
No. FIDE publishes separate Standard, Rapid and Blitz rating lists. Use the rating from the same list as the event; there is no official fixed conversion between the three pools.
Can I convert a Chess.com or Lichess rating to FIDE Elo?
There is no exact universal conversion. Pools, time controls and player activity differ, so this page explains the selected pool instead of producing a false exact FIDE number.
Is this an official FIDE calculator?
No. The FIDE modes implement the current rated-player formula, but this page cannot verify event eligibility, the official published starting rating and K-factor, or the submitted rating report. Only the resulting FIDE rating list is official.
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