Grade Point Averages (GPAs) are numbers within a 4.0 GPA system. A 1.5 GPA is therefore equal to a ‘C’ score. You can figure out your Grade Point Average using our grade equivalents program below. Before you know what format to put your scores into, look up your college or universityâ€™s reporting guidelines. They may use letters, percentages or GPA. College class grades usually combine actual grades with semester hours and course credits to determine the final grade.