A 2.5 GPA falls between a "B" and a "C" letter grade. When the grade is B-, 2.7 is used to figure the GPA. When the letter grade is a C+, 2.3 points are awarded.
Most teachers grade with letter grades. The letters are then changed to points for the GPA to be figured. A GPA is figured on 4.0 scale. An "A" grade gives four points per credit, and a "D" gives only one point. A "B" in a class that is worth three credits generates nine points towards the GPA. If two classes worth three credits each are taken with one "B" and one "C," the GPA is 2.5 total.