Designing Great Beers has the following conversion formula from SRM:
SRM * 1.97 = EBC
Calculating either one in the first place is pretty much the real trick. Good luck!
Oh don't give me none more of that Old Janx Spirit
No, don't you give me none more of that Old Janx Spirit
For my head will fly, my tongue will lie, my eyes will fry and I may die
Won't you pour me one more of that sinful Old Janx Spirit