Allows to convert a chess rating between chesscom, lichess, FIDE and USCF.
Available at https://paul2t.github.io/chess-rating-converter/
This is based on the data provided by https://chessgoals.com/rating-comparison/
Here is the data in csv format : data.csv
Here are some graphs showing the correlation between lichess and chesscom. Lichess is the vertical axis, chesscom is the horizontal axis.