If the question is "my rating is X, so what's my percentile?", here's a low-tech solution:
Every player's page has their percentile on it, so look at a few players with various ratings, see their percentiles, and construct a rough percentile chart that way.
I tried to find these online but couldn't seem to. Do they exist? And if so, how do I find them?
You can also look at this, archived on the USCF website:
http://www.uschess.org/archive/ratings/ratedist.php
It dates from November 2004, but if my own current percentile ranking is any indicator, the numbers haven't changed.
What I think you mean is the K-factor chart. this will tell you the maximun number of points you can earn for a win plus the bonus points. E Chess has not bonus system that I'm aware of!?
http://www.uschess.org/index.php/Announcements/May-2013-K-Factor-Change-Table.html
Good Luck!,
Coach Mike C
I tried to find these online but couldn't seem to. Do they exist? And if so, how do I find them?