text: what is the gpa for 4 b's , 1 a and 1 c -for a report card?   how many units for the respective classes? if they're all the same, then your divisor is 6, 1 for each class. gpa is a tla meaning grade point average. a = 4, b = 3, c = 2, d = 1, and f = 0. so you add up all the numeric substitutions and divide by the number of samples. in this instance, the answer is (3 + 3 + 3 + 3 + 4 + 2)/6 = 3.0.