What Is a Credit Hour?
A credit hour is the unit that US colleges and universities use to measure how much work a course involves and how much progress you have made toward a degree. Each course is worth a set number of credit hours, usually three or four, and you earn those credits when you pass the course. Your transcript adds them up.
How credit hours are counted
The traditional rule of thumb, used in US federal guidance, is that one credit hour represents about one hour of classroom instruction each week plus about two hours of work outside class, over a full term. A three-credit course would therefore involve roughly three hours in class and six hours of study each week.
Courses with labs, studios or clinical placements are counted differently, because contact time is longer. Online and accelerated courses squeeze the same total work into fewer weeks, so the weekly load is heavier.
Why credit hours matter
Credit hours decide your course load, your tuition bill at many institutions and your progress toward graduation. Full-time status usually means about 12 credit hours in a semester. Financial aid, visa rules for international students and athletic eligibility often depend on staying at or above a minimum number of credits.
Credits also travel. When you transfer, the receiving college decides which credits it accepts and how they count toward your major or general education requirements.
An example
A student takes four three-credit courses and one one-credit lab in a semester. That is 13 credit hours. If the degree needs 120 and the student earns about 15 per semester, graduation takes about eight semesters.
Related terms
Credit hours differ from grade points, which measure performance, and from the ECTS and CATS systems used in Europe and the United Kingdom. See also prerequisite, course load and full-time student.
Frequently asked questions
How many credit hours is a normal course?
Most college courses are three or four credit hours, though labs and short courses may carry one or two. Check your catalog, since values vary by institution.
How many credit hours do I need to graduate?
A US bachelor's degree commonly needs about 120 credit hours, and associate degrees about 60. Master's programs often range from about 30 to 60. Your program sets the exact number.
Is a credit hour the same as an hour of class?
Not exactly. It reflects the expected weekly work for one term, including class time and study outside class, so the hours of study are usually greater than the hours in class.