ELO Rating Performance Calculator
This is a rating performance calculator for ELO ratings (chess, for example). Rather than using the conventional "batch" formula however, this calculator calculates the "true" performance rating. That is, the rating for which predicted performance matches actual performance.

Enter your total score here: , and enter your opponent's ratings in the following boxes. When you are ready, click the "calculate" button.
Results: You entered 7 valid ratings, and a total score of 5. The calculated performance rating is 2519.