There's no conversion for ICC to USCF, most people have rating within 200 points, but some are higher and some are lower. For example GM have ratings in the 3000, but you're right that others will have a higher USCF rating.
Live ratings are a bit inflated here compared to ICC, and turn based even more so (lets say between 50-300 points), but by how much just depends.
How does the rating on chess.com compare to say, USCF, ICC, or FIDE ratings?
For instance, a USCF rating is usually higher than one's ICC. Let's say your ICC rating is like 1500, your USCF rating is probably about 1600 if I remember how those compare correctly.