How to use the Grade Calculator
List each assignment or exam with your score and its weight. The calculator multiplies each score by its weight, adds them up and divides by the total weight.
Worked example
Homework counts 20% and you scored 90, the midterm counts 30% and you scored 75, and the final counts 50% and you scored 82. Your grade is (90 × 20 + 75 × 30 + 82 × 50) ÷ 100 = 81.5. Mid-semester, enter only the parts you have finished to see where you stand now.
Working out what you need on the final
Subtract the weighted points you already have from the grade you want, then divide by the final’s weight and multiply by 100. Say you want 85 overall and the work you have finished, worth half the course, already gives you 45 points. You need 40 more points from a final worth 50, which means scoring 80 on it.
Planning for the final exam
Your final exam often carries the largest weight in a course, so it is worth knowing where you stand before it. Enter the grades you already have with their weights to see your current average, then use the final grade calculator to find the score you need on the final to reach the grade you want.
The formula
Grade = Σ(score × weight) ÷ Σ weight
Examples
- Exam 92 (30%), quiz 85 (20%), project 78/100 (50%)
Weighted grade: 83.60% Letter (common US scale): B Total weight entered: 100
- Two assessments
Weighted grade: 82.40% Letter (common US scale): B- Total weight entered: 100
Limitations and assumptions
Weights are used as entered, so they do not need to sum to 100.
Frequently asked questions
How is a weighted grade calculated?
Multiply each score by its weight, add the results and divide by the total weight.
Do the weights need to add to 100?
No, the calculator divides by the total weight entered.
How do I find the score I need on the final?
Use the final grade calculator.
Can I enter points out of a total?
Yes, write them as 78/100.