Contact your school's registrar to find out the school's GPA calculation policies, such as how much a plus or minus adds or subtracts from the grade. For example, some schools only use pluses, and the plus adds 0.5 to the grade, whereas schools that use both pluses and minuses usually add 0.33 for pluses and subtract 0.33 for minuses. Also, some schools only count grades earned at that school in your GPA, so if you transferred in credits, they would not affect your GPA. Your registrar's office can also provide a copy of your transcript if you do not know your grades and credit hours.
Add up the number of credit hours earned in all of your classes that count toward your GPA. Do not include credit hours earned in classes that do not affect your GPA, such as classes taken on a pass/fail basis.
Multiply the number grade points by the number of credit hours for each class that counts toward your GPA. For example, if a C+ is worth 2.5 grade points at your school and you earned a C+ in a three-hour course, multiply 2.5 by 3 to get 7.5.
Add all of the results together to find how many cumulative grade points you earned in college.
Divide the result by the number of credit hours taken to find your cumulative GPA. For example, if you earned 284 points for 95 credit hours, divide 284 by 95 to find that your GPA equals 2.99.