Acquire the unweighted point value offered for course grades. Your school's administrative office can provide this to you. Most schools use 4.0 for an "A," 3.0 for a "B," 2.0 for a "C," 1.0 for a "D" and nothing for an "F." However, schools might also adjust those values for plus or minus values, such as an "A+" or a "B-." In contrast, a weighted point value might use a 5.0 for an honor's level "A" grade, but this is not the scale you want for an unweighted GPA.
Multiply each grade's point value by the number of credits offered for the course. As an example, if you received an "A" in a 3-credit course, its total would be 12.0.
Add all the totals together. As an example, if your totals were 12.0, 9.0, 12.0 and 6.0, your total would be 39.0.
Divide the total points by the total number of credits. In the example, if you received a total of 12 credits, then you would divide 39.0 by 12.0, resulting in an unweighted GPA of 3.25.