Your grade point average (GPA) is calculated by dividing the grade points you receive for a course by the attempted credits of the course.
Grade points are determined by the number of credit hours for the course multiplied by the grade point, A=4, B=3, C=2, D=1and F=0. So if you completed BIO 101 with a B grade, that would be worth 12 grade points, 4 credits x 3 = 12. Then you take the grade points, 12 and divide it by the credits, 4 and you have a 3.00 GPA, which is a B average.
For a semester of grades looking something like this:
BIO 101 - 4 credits - B - 12 grade points
MAT 104 - 4 credits - C - 8 grade points
PSY 101 - 3 credits - A - 12 grade points
SPE 101 - 3 credits - A - 12 grade points
your grade points would cumulate to 44 grade points divided by 14 credits, for a GPA of 3.14.
or you can use the grade point calculator below. Put in your actual or anticipated grades and the credit hours and it will calculate your GPA for you.