the way to study this i reckon is to go to the us chess group and the fide chess group(?) (if there is one on here) and to look players up and compare their chess.com ratings to their otb ones. i'm tempted now 
but we'll see if i do it. i feel like is daily is more compact definitely at the top end of the scale though, so might be closer to fide ratings in terms of how they equate to playing strength.
is chess.com rating equal to fide rating
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Sep 29, 2021
0
#42
Well @DavidDoesChess that site is a little off for me, since my chess com blitz is 1200ish and my USCF classical is 1663
Sep 29, 2021
0
#44
Yeah. Time controls make a huge difference. You can spend as much time on one move as a whole rapid game. Some people thrive in shorter time controls and some in classical. The data people have gathered is a statistical average and there are plenty of outliers on both ends.
Ubik42 wrote:
Well @DavidDoesChess that site is a little off for me, since my chess com blitz is 1200ish and my USCF classical is 1663
That kind of variance is to be expected, I hope you added your ratings. Every bit helps!
NikkiLikeChikki wrote:
Do you have a standard deviation for these data?
No, I created a metric called average variation because I believe that will be more accessible to most people. That being said, I hope to make the data available for download in the next few months so anyone could do their own analysis.
According to the data I gathered on this website: chessratingcomparison.com 1500 chess.com blitz is about 1300 Fide.