How accurate is your chess.com rating to your elo rating?

They did this.
Everyone loves to say "Ohh your online rating is 8000 pts higher than your real rating because blah blah and if you really played OTB expecting...blah blah you'd be crushed blah blah" It doesn't seem to bear out in the facts though. In reality, the ratings are pretty close, with a lot of people having higher OTB ratings than online. So if you beat someone online, you're probably not that far off that in real life USCF, and might even be better.
https://www.chess.com/article/view/chesscom-rating-comparisons