Grade Calculator
Enter each score and its weight to see your weighted grade and letter grade. Add as many rows as your course needs.
Last updated October 19, 2026
Result
85.3%
Letter grade: B
Total weight: 100%
Show the work
- Homework: 90 × 20 = 1,800
- Quizzes: 85 × 20 = 1,700
- Midterm: 78 × 25 = 1,950
- Project: 88 × 35 = 3,080
- Sum of score × weight = 8,530
- Total weight = 100
- Grade = 8,530 / 100 = 85.3%
- 90+ A, 80+ B, 70+ C, 60+ D, below 60 F
How a weighted grade is calculated
grade = (score₁ × weight₁ + score₂ × weight₂ + …) ÷ (weight₁ + weight₂ + …)
Each score is multiplied by its weight, the results are added, and the total is divided by the sum of the weights. Because it divides by the total weight, the weights do not have to add up to 100: weights of 30, 30 and 40 give the same result as 3, 3 and 4.
The letter grade uses the common US scale: 90 and above is an A, 80 to 89 a B, 70 to 79 a C, 60 to 69 a D, and below 60 an F. Schools differ, so check your syllabus for its own scale and weights. A score above 100, such as extra credit, is allowed.
See how we calculate for the formulas, sources and review schedule behind every calculator.
How to use the Grade Calculator
- Enter the score you earned in each category or assignment, as a percentage.
- Enter the weight of each one, using the percentages from your syllabus.
- Add or remove rows to match your course.
- Read the weighted grade and letter grade, then use Copy, Print or Share.
Worked example
Homework 90% (weight 20), quizzes 85% (weight 20), midterm 78% (weight 25) and project 88% (weight 35): 90 × 20 + 85 × 20 + 78 × 25 + 88 × 35 = 1,800 + 1,700 + 1,950 + 3,080 = 8,530. Divided by the total weight of 100, the grade is 85.3%, which is a B.
| Percentage | Letter grade |
|---|---|
| 90 and above | A |
| 80 to 89.99 | B |
| 70 to 79.99 | C |
| 60 to 69.99 | D |
| Below 60 | F |
Frequently asked questions
Do the weights have to add up to 100?
No. The calculator divides by the total weight, so any set of weights works. The total is shown so you can check it against your syllabus.
Can I enter a score above 100?
Yes. Scores above 100, such as extra credit, are accepted. Negative scores are not.
What if my school uses plus and minus grades?
This calculator shows the standard letter without plus or minus. Your school may use a different scale, so use the percentage as the exact figure.
Are my scores stored or sent anywhere?
No. The calculation runs in your browser and nothing you enter is saved or uploaded.