CREDITS--Credits are awarded on the semester-hour basis. The distribution of time between class activities and outside preparation varies from course to course; for the average student, however, at least forty hours of work per semester planned and arranged by the University faculty are required to gain 1 credit.
The grades of A, A-, B+, B, B-, C+, C, D, and F indicate a gradation in quality from Excellent to Failure and are assigned the following grade-point equivalents:
Grade, Grade-Point Equivalent
Grade points are determined by multiplying the grade-point equivalent of the grade earned by the number of credits for the subject, for example, ENGL 015 GWS, 3 credits, with a grade of A (grade-point equivalent 4.00) yields 12 grade points.
For further information, see: http://www.registrar.psu.edu/grades/grading_system.cfm