Step 1

Begin a chart to make calculating your GPA easier. Write down each class included in your GPA, one class per line. Label this first column with the name "Class."

Step 2

Start a new column, immediately beside the first, labeled "Weight." List the credits or hours for each class indicated in the first column. This is the weight of each class -- the number of times the grade received is multiplied. Keep each column and line aligned to make the chart simpler to read.

Step 3

Fill in the grade you earned after the course and credits or hours. Label this column "Grade." Use the letter grade, including any plus or minus signs if applicable.

Step 4

Translate each letter grade into a numerical equivalent. On a standard 4.0 scale -- the one most commonly used in colleges -- an A is equal to a 4.0, a B is 3.0, a C is 2.0 and a D is 1.0. A failing grade receives zero credit. If your school recognizes other grades -- such as A- or C+ -- or gives an automatic boost to certain courses -- usually honors or college courses if you are in high school -- use the system your school uses.

Step 5

Multiply each numerical grade by its weight to determine each class's individual worth. For example, a lab worth one credit with a grade of B is worth 3, while another class, worth 3 credits and a grade of A is worth 12.

Step 6

Add together each class's worth. Divide that sum by the total weight of each class. For instance, in the previous example with a B worth 3 and an A worth 12, the total is 15. Divided by the weight of 4 -- 1 for the lab and 3 for the other class -- the result is 3.75.