A college quarter hour has two-thirds of the value of a semester hour. This is because three quarters of instruction corresponds to two semesters in college.
According to Synonym.com, the quarter system is used by 20 percent of higher education institutions. A quarter is 10 weeks' worth of instruction, unlike a semester, which is 15 weeks' worth of instruction. Three quarters make up an academic year. Students can convert semester hours to quarter hours by multiplying the number of semester hours by 1.5. For example, 30 semester hours, a full-time year of study, is equivalent to 45 quarter hours of study. According to More Than a Test Score, many courses in a quarter-hour system are worth four units each.