Grade Calculator
Combining Homework, Quizzes, and Exams Into One Grade
Most course syllabi don't grade everything equally — homework might count for 10% of the final mark, quizzes for 20%, midterms for 30%, and the final exam for the rest. Averaging the raw scores without accounting for those weights gives a misleading number, sometimes off by ten points or more. This calculator applies the actual weighting scheme so the resulting grade matches what the instructor's gradebook will show.
The Formula
Each component score is multiplied by its assigned weight, the products are summed, and the total is divided by the sum of the weights. If the weights entered don't add up to exactly 100%, the calculator normalizes by the actual total rather than assuming a mistake.
Where This Matters
- Mid-semester grade checks — plugging in scores as they're returned shows whether a student is tracking toward the grade they need, before all assignments are graded.
- Comparing grading schemes — some instructors offer a choice between weighting structures (for example, dropping the lowest quiz); running both scenarios shows which is more favorable.
- Catching syllabus errors — if published weights don't sum to 100%, that's worth flagging to an instructor before it affects a final grade dispute.
Worked Example
Homework averages 92% (weight 10), quizzes average 85% (weight 20), the midterm is 78% (weight 30), and the final exam is 88% (weight 40).
Total weight = 10 + 20 + 30 + 40 = 100
Final Grade = 8480 / 100 = 84.80%
| Percentage range | Letter grade |
|---|---|
| 93 – 100 | A |
| 90 – 92 | A- |
| 87 – 89 | B+ |
| 83 – 86 | B |
| 80 – 82 | B- |
| 77 – 79 | C+ |
| 73 – 76 | C |
| 70 – 72 | C- |
| 60 – 69 | D range |
| Below 60 | F |
84.80% falls in the B range on this scale.
How to Use This Calculator
- Enter a score (as a percentage) and its weight (as a percentage) for the first grading category.
- Repeat for each additional category — up to six score/weight pairs are supported, with the last four optional.
- Select Calculate to see the overall weighted grade and its letter equivalent.
Related Calculations
To find the exact score needed on a remaining exam to hit a target grade, use the Final Grade Calculator, or check a single converted score with the Exam Score Calculator.