You’re allowed to enroll in up to 18 credit hours (or 19 for programs within the Ira A. Fulton Schools of Engineering) for spring and fall semesters and 7 credits for each summer session. Each course is usually 3 to 4 credit hours, so this would mean you could enroll in about six classes per semester and two classes per summer session. So, 18 credit hours would equate to 9 credits and about three classes per session A and session B.