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FIDE rating calculator

Your FIDE rating change by FIDE's current rules, for standard, rapid and blitz: FIDE's own expected-score table, the 400-point rule, the K-factors and the 700 limit. It works out a first rating too.

Your rating

Rating list
Your status on this list
K-factor (the same for standard, rapid and blitz)

Games this month

A rating period is one month. Enter every rated game in it: the 700 limit and the rounding apply to the month as a whole. Games against unrated opponents do not change your rating.

  1. Game 1: result

Press Enter in a rating to move to the next game; at the last one it adds a new game.

Result

Your result appears here as you type.

  • Your FIDE rating, a whole number from 1400.
  • At least one game: the opponent's FIDE rating and your result.

How it is calculated

These are FIDE's own rules, from the Rating Regulations and the Rapid and Blitz Rating Regulations in force since 1 March 2024, with the changes made since.

  1. Expected score from FIDE's table. For each game, the difference between your rating and your opponent's is looked up in FIDE's conversion table (article 8.1.2), which gives your expected score to two decimals. FIDE uses the table, not a formula: 92 to 98 points above your opponent gives 0.63, and 92 to 98 below gives 0.37.
  2. The 400-point rule. A difference of more than 400 points counts as 400. Since 1 October 2025, standard ratings apply this only to players rated below 2650; from 2650, the full difference is used. Rapid and blitz keep the rule for everyone.
  3. Rapid and blitz games that are not rated. Since 1 December 2024, a rapid or blitz game between players 600 or more points apart is not rated if either player is rated above 2600.
  4. Rating change. Each game adds your score minus the expected score. The total for the rating period, which is one month, times K is your change, rounded to the nearest whole number with .5 rounded away from zero. Games against unrated opponents do not change a rated player's rating.
  5. K-factor. 40 for a player new to the list until they have completed events with at least 30 games; 40 until the end of the year you turn 18, while your rating stays under 2300; 20 while you are rated under 2400; and 10 once your published rating has reached 2400, even if it drops below again. The same K-factors apply to standard, rapid and blitz. If K × the games in a month would exceed 700, K becomes the largest whole number that keeps it within 700.
  6. First rating. A player new to the list needs at least 5 games against rated opponents, pooled from events within 26 months. Their opponents' average rating is taken with two hypothetical opponents rated 1800 added, both counted as draws, and the rating difference from FIDE's table (article 8.1.1) for the percentage scored, those two draws included, is added to it. The result is rounded to a whole number, is at most 2200, and is published only if it is at least 1400. A zero score in a player's first event is disregarded.

One detail the Rating Regulations leave open is how the percentage is rounded to the table's whole-percent steps for a first rating. This calculator rounds to the nearest whole percent with 0.5% rounded up, as FIDE's Title Regulations (1.4.9) do for the same table.

Frequently asked questions

Which FIDE K-factor applies to me?
K is 40 for a player new to the rating list until they have completed events with at least 30 games, and 40 until the end of the year of a player's 18th birthday while their rating stays under 2300. Otherwise it is 20 while the rating is under 2400, and 10 once a published rating has reached 2400, even if it drops below again. Standard, rapid and blitz use the same K-factors, as they have since October 2022; before that, rapid and blitz used 20 for everyone.
Does the 400-point rule still apply?
Yes, for most players: a rating difference of more than 400 points counts as 400. Since 1 October 2025, standard ratings use the full difference for players rated 2650 and above. Rapid and blitz keep the 400-point rule for everyone, and since 1 December 2024 a rapid or blitz game between players 600 or more points apart is not rated when either is rated above 2600.
How is a first FIDE rating worked out?
From at least 5 games against rated opponents, pooled from events within 26 months. The average rating of the opponents is taken with two hypothetical 1800-rated opponents added, both counted as draws, and the rating difference for the percentage scored is added to it. A first rating is at most 2200, and it is published only if it is at least 1400.

Official sources