How to use the grade calculator
Pick the method your syllabus uses. Weighted grade is for classes where categories or assignments have stated percentages. Points-based grade is for classes where every point goes into one pool. Final exam target is for when you already know your current grade and what the final is worth.
In the first two modes, add one row per assignment or category with a name, a score and a weight (or points earned and points possible). Names only label the results, but they make it easy to check each line against your gradebook later.
- Choose Weighted grade, Points-based grade or Final exam target.
- Enter a row for each assignment or category: name, score and weight, or name, points earned and points possible.
- Set the course grade you're aiming for. In points mode, add the points still to come.
- For a final exam target, enter your current grade and the final's weight instead.
- Calculate, then read the current grade, what you need on the remaining work, and the scenario table.
Weighted grade formula
Each item adds score times weight to your course total. A 92% that counts for 30% of the class adds 27.6 points out of a possible 100. Add every item's points and you have the weighted grade.
If your weights don't reach 100% yet, the calculator divides your points so far by the weight you've entered. That gives your current grade on finished work. The weight that's left becomes the remaining work it plans around.
Item contribution = score % x weight % / 100Weighted grade = sum of all item contributionsCurrent grade with weights under 100% = points so far / weight entered x 100Average needed on remaining work = (target - points so far) / remaining weight x 100
Worked examples with real numbers
Here's the same set of formulas run on a few common situations. The second row is worth a look: 80% and 90% average to 85% if you ignore weights, but the 90% carries more weight, so the current grade is 86%.
| Situation | Inputs | Math | Result |
|---|---|---|---|
| Full weighted grade | 92% at 30%, 84% at 30%, 95% at 40% | 27.6 + 25.2 + 38.0 | 90.8% |
| Half the course graded | 80% at 20%, 90% at 30% | 43 points / 50% entered | 86.0% current grade |
| Rest of term for a 90% | Same 43 points, 50% left | (90 - 43) / 0.50 | 94% average needed |
| Points-based grade | 87 of 100 points | 87 / 100 x 100 | 87.0% |
| Points needed for 90% | 87 of 100 now, 100 points left | 180 target points - 87 | 93 of the 100 left |
| Final exam for an 85% | 80% current, final worth 40% | (85 - 80 x 0.60) / 0.40 | 92.5% on the final |
What do I need on my final?
Switch to Final exam target. Enter your current grade, the course grade you want and the final's weight. The calculator works out how many course points your current grade already locks in, then asks the final to cover the rest.
Say you have an 86% going into a final worth 25%. Your earlier work counts for 75% of the class, so it locks in 64.5 points. To finish with a 90 you'd need 102% on the final, which only works with extra credit. To finish with an 80 you'd need 62%.
The result also shows your best case (89.5% here, with a perfect final) and your worst (64.5%, with a zero). It tells you how much each 10 exam points moves your grade, too: 2.5 points for a 25% final.
Required final score = (target - current grade x (1 - final weight)) / final weight
Weighted vs points-based grades
Using the wrong method is the most common reason a calculated grade doesn't match the gradebook. In a weighted class, a 100-point project doesn't count twice as much as a 50-point quiz if the syllabus puts them in separate categories with their own percentages.
In a points class, size is the weight. An 18 out of 20 quiz and a 42 out of 50 exam add up to 60 out of 70, about 85.7%. Averaging the two percentages gives 87%, which overstates the grade because the exam is the bigger item.
| Mode | What you enter | Use it when |
|---|---|---|
| Weighted grade | Score % and weight % | The syllabus lists percentages for categories or items |
| Points-based grade | Points earned and possible | Every point counts the same toward one total |
| Final exam target | Current grade, target, final weight | Your gradebook shows a current grade before the final |
Why your result may not match the gradebook
The calculator does the math exactly, but it can't see your course's rules. Canvas and other systems often show a current grade based only on graded work, and some count missing work as zero. Check which view you're copying before you use it in final exam mode.
Apply dropped scores, curves, late penalties and replacement exams before you enter numbers. Only enter extra credit your class actually offers. The letter band in the result uses a common 90/80/70/60 scale for reading the number, and your syllabus may use different cutoffs or rounding.
- Enter exact scores, not rounded letter grades.
- Make sure every weight or point value comes from the same grading period.
- Don't count ungraded work twice.
- Weights over 100% are rejected, so check the syllabus for bonus categories.
- Your instructor's gradebook and written policy decide the official grade.
Sources
These references explain how syllabi set grading weights and how learning management systems total them.