iRating exists to solve a core problem in open online racing: without skill-based matching, a new driver might find themselves racing against a former professional simulator driver, producing a demoralizing and uncompetitive experience for both parties. By calculating a numerical skill estimate for each driver based on their results against other rated participants, iRating allows iRacing to split large race fields into evenly matched sub-sessions and to determine championship divisions. Faster, more consistent drivers accumulate higher iRating figures and are sorted into sessions with equally strong competition.
The system is described as an Elo-type rating, meaning it uses the well-established principle that a driver gains more rating points by beating highly rated opponents than by beating low-rated ones, and loses more for finishing behind a much lower-rated competitor than for finishing behind an equal. This self-correcting property means that a driver who is genuinely faster than their current rating will gain points steadily as they outperform expectations, while a driver placed too high will lose ground until the rating settles at a level that reflects true performance.
iRating changes after each qualifying official ranked race based on finishing position relative to the expected finish given the ratings of all drivers in the session. Finishing above expectations — beating higher-rated drivers, or avoiding contact and penalties — earns iRating points. Finishing below expectations costs points. The magnitude of the gain or loss depends on the gap between a driver's rating and the average rating in their session, as well as how much better or worse they performed than the statistical prediction.
For iRating to be affected at all, a minimum number of drivers — generally six — must participate in the race. Races with fewer participants are too small to produce meaningful comparative data and are therefore excluded from the rating calculation.
Like Safety Rating, iRating is tracked separately for each of iRacing's five competition disciplines: sports cars, formula cars, oval, dirt road, and dirt oval. A driver who is highly rated in oval racing starts effectively fresh in road racing and must build a separate rating there. This separation reflects the fact that the driving skills and racecraft required in each discipline are genuinely distinct, and a dominant oval racer would not necessarily be competitive in formula cars or dirt oval from the outset.
The primary practical use of iRating is to split large groups of registered drivers into multiple race sessions at race time, with each session populated by drivers of similar rating. This means a driver with a high iRating will be placed in a more competitive session than a driver just starting out, regardless of the time of day or the total number of drivers registered. Within each session, a per-series championship division is assigned based on iRating, so that mid-pack drivers in a given session are competing for their own division title rather than being invisible in an overall standings dominated by faster competitors.
iRating and Safety Rating coexist as parallel but entirely independent metrics. Safety Rating rewards clean and incident-free driving regardless of finishing position; iRating rewards fast, race-winning performance regardless of how cleanly it is achieved. In practice, drivers need both: a high iRating places a driver among faster competition, while a sufficiently high Safety Rating is required to hold the license class necessary to enter more prestigious series in the first place. Only official ranked races affect either metric; hosted and league sessions are always unranked and have no effect on either figure.