How to Calculate School Grades by Percentage

By Darcie Elle
Calculating your school grades allows you to not worry what will appear on your report card.

Whether you are anxious about your grades as finals approach, or you are simply curious about your progress throughout your school term, the ability to calculate your school grades by percentage is a useful skill to help keep you on track of your academic goals. You do not need to spend hours computing complex calculations to figure out your grades. Over time, calculating your school grades by percentage will become easy, and you will no longer have to fret about what letters will show up on your report card.

List all of the grades you have received in each of the categories that your instructor takes into consideration for grades. For example, if your instructor considers homework, tests, quizzes and group project grades, list all of the grades you have received in each of these categories.

Calculate your average grade within each of these categories by adding all of the scores together and dividing that sum by the number of scores. For example, if your quiz scores are 85, 76, 92 and 89, your average grade in this category is 85.5, or 86 (85+76+92+89 = 342; 342/4 = 85.5).

Determine the amount each category is worth in calculating your overall grade. At some point in the term your instructor has probably told you this information. Usually, it also can be found on your course’s syllabus. You might see a breakdown like the following:

Homework – 25 percent Tests – 50 percent Quizzes – 15 percent Group projects – 10 percent

Multiply the percentage assigned to each category by your average grade in that category. For example, if your average grade in quizzes is 86, multiply 86 by 15 percent (86 X 15 = 12.9).

Add together all of the results from each category. The total sum is your grade calculated by percentage. For example, look at the following results:

Homework – 22.5 Tests – 40 Quizzes – 12.9 Group projects – 9.2

Add these results together (22.5+40+12.9+9.2 = 84.6). The sum is 84.6, or 85, which is a B.


The more often you calculate your grades by percentage, the easier it will become.


It is best not to wait until the end of the term to calculate your grades by percentage because there will be more scores to track. Instead, calculate your grade periodically throughout the term and record your progress regularly.

About the Author

Darcie Elle graduated a semester early from Georgetown University with a degree in culture and politics. After graduation, she worked in the finance industry before deciding to pursue her passion for writing. Elle is now a full-time writer and divides her time between freelance work and writing novels and screenplays.