In the 4 point grading scale, a number is assigned to a specific letter grade.  For example, an A+ is assigned a 4.333, an A is 4.0, an A- is a 3.667 and so forth.  For B’s, C’s and D’s the scale works the same way respectively with the numbers 3, 2 and 1.  So for an additional example, the letter grade of B would represent a 3.0 and a letter grade of C- would represent a 1.667.

A basic calculation will clarify this concept.

Say we want to determine the semester weighted grade point average for the following classes taken and completed.

Algebra II: B (4 credit hours)

Intro to Biology: B+ (3 credit hours)

Creative Writing: A- (3 credit hours)

Early European history: A (3 credit hours)

Economics 101: C (4 credit hours)

So let’s assign the 4 point scale number to each letter grade.

Algebra II: 3.0

Intro to Biology: 3.333

Creative Writing: 3.667

Early European history: 4.0

Economics 101: 2.0

We see that the total number of class credit hours is 17 and with this we can now find the weighted GPA term for each class as follows.

Algebra II: (3.0)(4/17) = 0.706

Intro to Biology: (3.333)(3/17) = 0.588

Creative Writing: (3.667)(3/17) = 0.647

Early European history: (4.0)(3/17) = 0.706

Economics 101: (2.0)(4/17) = 0.471

So now we can determine the final, semester weighted grade point average.

GPASEM = 0.706 + 0.588 + 0.647 + 0.706 + 0.471

GPASEM = 3.12 (A little bit better than a B)