Assign a number to each letter grade. Use 4 for A, 3 for B, 2 for C, 1 for D, and 0 for F.
Go through your transcripts and write down the number of A's, B's, C's, D's and F's you received.
Assign a number for each grade by following the scale in Step 1.
Add the numbers.
Add up the total number of classes you took.
Divide the number you got when you added your grade numbers together by the total number of classes you took. That's your GPA for the year.
Calculate a GPA for each year of elementary school.
Add up each year's GPA to come up with a cumulative number.
Divide that number by the total number of years you have been in elementary school. The resulting number is your overall elementary GPA.