Grade Book: Calculate an Average Using a Point Based Grading System

You can choose the aggregation method that best suits your needs for calculating a final grade, or Course total in Moodle.

“Mean of grades” will calculate an average of all grade items and categories.

“Weighted mean of grades” enables you to assign weights to grade items and categories.

“Simple weighted mean of grades” enables you to use a point system to calculate grades.

The “Simple weighted mean of grades” aggregation type will calculate a student’s total score as a percentage of each graded item. In other words, each item is divided by the total possible points possible. All the item results are summed and divided by the total number of possible points possible for the course.

Grading Criteria

In this example, you only give 2 tests and a final for a grand total of 350 points.

Grading Criteria
Test 1 100 points
Test 2 100 points
Final Exam 150 points
Total 350 points

The formula to calculate the Course total is: (((Test 1 score/100) + (Test 2 score/100) + (Final Exam score/150)) / 350) * 100

To create this formula in the Moodle Grader report:

  1. From the course main page, in the Administration block, click Grades. 2
  2. Select the Categories and items tab.
  3. For the course folder, in the “Aggregation” drop-down list, select Simple weighted mean of grades.
    NOTE: You can add and delete columns to the grade book and the Course total will update.
  4. If you are not administrating the quizzes via Moodle, create the quiz columns. For each column you want to add:
    • a. Scroll to the bottom of the screen and click Add grade item. The New grade item screen is displayed.
    • In the “Grade item” area, add the required information.
    • Scroll to the bottom of the screen and click Save changes.
  5. Scroll to the bottom of the screen and click Save changes.
  6. Select the View tab. The course total will display the final grade.
    NOTE: The Course total will not reflect the final grade until all grades are input.