How to calculate grade percentages

Written by mark kennan
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Many teachers assign different weights to different categories of assignments in their classes so they can put an increased emphasis on certain assignments, such as big tests even though the teacher may assign relatively few tests compared to homework assignments, the tests count for a larger part of the grade. In order to calculate your grade percentage, you need to know all of your grades for the term, as well as your professor's grading system.

Skill level:
Moderately Easy

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  1. 1

    Look up your teacher's grading policy by checking your class syllabus or asking the teacher. For example, a teacher may weight tests 45 per cent, quizzes 35 per cent and homework 20 per cent.

  2. 2

    Calculate your average for each category by adding your grades on each assignment in the category and dividing the total by the number of assignments in the category. For example, if you had five tests and you scored 95, 88, 91, 79 and 85, your total would be 438. You would then divide 438 by five, the number of tests, to find your test average equals 87.6 per cent.

  3. 3

    Convert the percentage weights to decimals by dividing by 100. In this example, you would divide 45 per cent by 100 to get 0.45. Likewise, 35 per cent would become 0.35, and 20 per cent would become 0.2.

  4. 4

    Multiply the average grade in each category from step 2 by the weight for each category expressed as a decimal in step 3. For example, you would multiply your test average of 87.6 times 0.45 and get 39.42.

  5. 5

    Add the results from each category from step 4 to determine you total grade. For example, if you had a 39.42 in tests, a 33.28 in quizzes and a 19.3 in homework, your total grade would be a 92 per cent.

Tips and warnings

  • If your teacher only has one category, you only need to perform step 2 to calculate your average.

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