Otoh, there is an SAT:Iq conversion chart floating around on the web (should be taken with a grain of salt!) I have read, and I think it is reasonable, that it is impossible to achieve more than one is capable of (aka higher than your innate potential), so you could think of your act scores as a minimum statement of your potential.

There might be a similar one for act scores, but I could not find one, upon briefly googling.

http://www.iqcomparisonsite.com/GREIQ.aspx