Chess.com uses the Glicko rating system. If you search the archives (the little box in the upper right that says "search the forums"), you'll find a number of threads that will explain how it works.
chess.com rating system
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hello all,
I am wondering what chess.com is using as a rating system?
Because on chesscube.com, i am rating more than 1600 (ELO system) whereas on chess.com, i can't even pass the 1400 bar...
OTB, i am roughly 1600 too.
thanks for your answers
eatherquake