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Grade Calculator with Weights
Your categories
Example: Homework 85% (20%), Quizzes 90% (30%), Exams 78% (50%) — 17 + 27 + 39 = 83.0%, letter grade B.
Behind the numbers
How your weighted grade is calculated
Not every assignment counts the same. A weighted grade multiplies each category score by its weight, then adds the results. A category worth 50% of your grade moves the final number five times as much as a category worth 10%. The weights must add up to 100% — if they add up to more or less, the calculator tells you and does not give a final grade, because the result would be wrong.
For the example: 85 × 0.20 = 17, 90 × 0.30 = 27, 78 × 0.50 = 39. 17 + 27 + 39 = 83.0%. On the usual US scale (90–100 A, 80–89 B, 70–79 C, 60–69 D, below 60 F), 83% is a B.
Examples
Example weighted grades
| Categories | Weighted total | Letter |
|---|---|---|
| Homework 85% (20%), Quizzes 90% (30%), Exams 78% (50%) | 83.0% | B |
| Homework 90% (10%), Quizzes 80% (20%), Exams 70% (70%) | 74.0% | C |
| Homework 100% (25%), Tests 80% (75%) | 85.0% | B |
| All categories 100% | 100.0% | A |
Tips for a better final grade
Put the most effort into the heaviest category — five points gained on a 50% exam is worth more than five points on a 10% homework set.
Check your syllabus first: weights differ by class, and a quiz can be 10% in one course and 30% in another.
Use the calculator before a final exam to see exactly what score you need — change the exam score until the total reaches the grade you want.
Do not skip low-weight work: zeros in a 10% category still cost you up to 10 points off your final grade.
Good to know
Frequently asked questions
What if my weights do not add up to 100%?
Then something is missing or double-counted. Add up the weights from your syllabus — homework, quizzes, tests, participation and the final exam — and make sure the total is exactly 100 before calculating.
How do I find the weight of each category?
Look at the grading section of your course syllabus. It usually lists percentages like homework 20%, quizzes 30%, exams 50%. If it lists points instead of percentages, divide each category's points by the total points to get its weight.
Can I use this calculator for a college class?
Yes — weighted grading works the same way in high school and college. Just enter the categories and weights from your syllabus; the letter scale (90 A, 80 B, 70 C, 60 D) matches the standard US scale most schools use.
What score do I need on the final to get an A?
Enter your current scores and weights, then try different final exam scores in the exam row until the total reaches 90%. That score is the minimum you need — anything higher gives you a cushion.