There is no set number of credits necessary to graduate from high school or college. This number varies by educational institution and major at the university level, and by the state at the high school level. The average number of credits needed in higher education is 64 for a 2-year associate's degree, and 120 for a 4-year degree.
At the high school level, depending on the state, students need to earn between 22 and 28 credits on average. Credits are awarded through coursework and potentially standardized testing. Program advisers and school course catalogs at the high school and university level can usually provide more information about the credit requirement for graduation.