How to Calculate Student Grades by Percentage Using a Calculator

Written by michelle foster
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How to Calculate Student Grades by Percentage Using a Calculator
Don't be surprised when report cards are issued. Calculate your grades beforehand. (Jupiterimages/ Images)

Did you ever wonder how a teacher uses numerical grades from tests to come up with a letter grade of A, B, C, D or F? Understanding how the letter grade is calculated can help students and parents make sure the correct grade is registered on a report card. Determining a grade is not difficult; after completing the process a few times, it becomes simple.

Skill level:

Things you need

  • List of all grades earned in class
  • Weight the teacher gives each category of grades (for example, tests count for 40 per cent of the final grade, homework counts for 20 per cent and the exam counts for 40 per cent)
  • Calculator

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  1. 1

    Make a column for each grade category such as homework, quizzes, tests and exams. Under each column, list the grades earned, one below the other.

  2. 2

    Using the calculator, add the numbers in each column together and write the sum of each column below the last grade in each column. Count the number of grades received in the first column. Enter the sum of grades in the first column and divide it by the total number of grades. Repeat for each column. You will have a one numerical grade for each category.

  3. 3

    Multiply the grade in each category by the percentage that is assigned to it. For example, if the average grade in tests was 86.4 and tests are worth 40 per cent of the grade, multiply 86.4 by 0.40. If the average grade in homework was 99.1 and homework was worth 20 per cent, multiply 99.1 by 0.20.

  4. 4

    Add the numbers in each category together to determine the numerical grade. Compare this grade to the grading scale to determine the letter grade of A, B, C, D or F.

Tips and warnings

  • Each school has a different grading scale. Many schools use the scale below, but check the student handbook or class syllabus to verify.
  • A -- 90 to 100
  • B -- 80 to 89
  • C -- 70 to 79
  • D -- 60 to 69
  • F -- below 59

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