Tom Kerrigan's Home Page  

Pool This page calculates the APA rating that has the highest probability of matching the specified win/loss record. Note: Enter the number of games you've won and lost, not the number of matches.
Note: This is basically a coin toss math problem. Calculating the odds of a player winning a certain number of games is the same as calculating the odds of somebody flipping a certain number of heads. I doubt this page can provide any insight into how the APA calculates ratings. 