Add up the points earned on all assignments, quizzes, tests, and exams
Add up the total possible points for all assignments, quizzes, tests, and exams
Divide the points earned by the total possible points
Multiply the result by 100 to get the percentage grade
If using weighted categories, multiply each category average by its weight
Add the weighted category scores together to get the final grade
Convert the final percentage to a letter grade using the grading scale
Check whether any extra credit should be added before finalizing the grade