This is roughly the conversion for different sites. CC stands for Chess.com, and Li stands for LiChess.
1000 FIDE->1200 USCF->1100 CCBlitz->1250 CCRapid->1450 LiBlitz->1500 LiClassic
1200 FIDE->1350 USCF->1300 CCBlitz->1450 CCRapid->1600 LiBlitz->1700 LiClassic
1400 FIDE->1500 USCF->1450 CCBlitz->1600 CCRapid-> 1720 LiBlitz-> 1850 LiClassic
1600 FIDE->1700 USCF->1600 CCBlitz->1720 CCRapid->1850 LiBlitz->2000 LiClassic
1800 FIDE->1900 USCF->1850 CCBlitz->1820 CCRapid->2050 LiBlitz->2150 LiClassic
2000 FIDE->2075 USCF->2050 CCBlitz->1900 CCRapid->2200 LiBlitz->2250 LiClassic