Grade points used
A+ and A = 4.0, A− = 3.7, B+ = 3.3, B = 3.0, B− = 2.7, C+ = 2.3, C = 2.0, C− = 1.7, D+ = 1.3, D = 1.0, D− = 0.7, F = 0. Courses with zero credits (or pass/fail courses you leave out) don't affect the result.
Raising your GPA
Courses with more credits move your GPA more. Add a planned course with the grade you're aiming for to see what your cumulative GPA would become.