Convert your grade in a class into grade points using the conversion information above. For example, if you got an A- in a class, you would earn 3.7 grade points.
Multiply the grade points you earned in a class by the number of credits the class is worth. When you enroll in a college course, it will tell you how many credits the class is when you sign up. For example, if you enrolled in a class worth three credits, and got a B, then you would get nine (three credits x three grade points). Do this for each class.
Add up all the grade points, then add up all the credits. Divide the grade point total by the credit total to get your grade point average. For example, if all the grade points added up to 34, and the credits added up to 10, your GPA would be 3.4 for that semester (34/10).