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 check out this website below!  Put in your actual or anticipated grades and the credit hours and it will calculate your GPA for you!