How to use the final grade calculator
- Find your current grade. Use the percentage your gradebook shows right now. If you only know your category averages, switch to “From categories” and enter each category’s weight and your average in it.
- Enter the final exam weight. Your syllabus lists it, often 15% to 40% of the course grade. If the final sits inside a larger “tests” category, see the section on tricky syllabi below.
- Enter the grade you want. Tap a letter chip for the usual 90/80/70/60 cutoffs, or type your own target, such as 89.5 if your teacher rounds up.
- Read the result. The large number is the minimum score you need. The table below it shows the score for every letter grade, and the floor and ceiling show your course grade with a 0 or a 100 on the final.
- Try a what-if. Switch on “What if I score…” and type a realistic score to see the course grade it produces.
The final exam formula
Needed on final = (target − current grade × (1 − w)) ÷ w
w = final exam weight as a decimal (25% → 0.25)
The idea is simple: everything graded so far makes up (1 − w) of the course, and the final makes up the rest. Solve for the final score that makes the two parts add up to your target.
Worked example. You have an 85% and the final is worth 20%. To finish with an 80%, you need (80 − 85 × 0.80) ÷ 0.20 = (80 − 68) ÷ 0.20 = 60% on the final. To keep a 90% A you would need (90 − 68) ÷ 0.20 = 110%, which is out of reach without extra credit.
The University of Calgary’s Student Success Centre shows the same math with points. A student has 55 of the 70 course points available so far and the final is worth the other 30. To reach 80, they need 80 − 55 = 25 of the final’s 30 points, which is 83.33%. Entered here as a current grade of 55 ÷ 70 = 78.57% with a 30% final, the calculator gives the same 83.33%.
How to work out your current grade from categories
Most syllabi weight categories: homework 25%, quizzes 15%, tests 35%, final 25%, for example. Your current grade is not the plain average of those categories. It is the weighted average of the categories that have grades in them, divided by their combined weight.
This is how Canvas computes the “current grade” students see. Instructure’s example uses three groups weighted 20%, 50% and 30%. With 75%, 98% and 87% in them, the course grade is 0.75 × 0.20 + 0.98 × 0.50 + 0.87 × 0.30 = 90.1%. If the 30% group had no grades yet, Canvas leaves it out and divides by 0.70 instead: (0.15 + 0.49) ÷ 0.70 = 91.43%.
The calculator opens with an example of this kind: homework worth 25% at 92%, quizzes worth 15% at 84% and tests worth 35% at 78%, with a 25% final still to come. The graded categories bank 23 + 12.6 + 27.3 = 62.9 points of the 75 available, so the current grade is 62.9 ÷ 75 = 83.9%. An A at 90% would need (90 − 62.9) ÷ 0.25 = 108.4% on the final, so it is out of reach without extra credit, while a B at 80% needs 68.4%.
Ohio State’s teaching center points out the catch: missing work that has not been entered as a zero is simply ignored, so the current grade can look higher than it will be. If you have missing assignments, count them as zeros in your category averages before you plan around the final.
How much the final can move your grade
The weight of the final decides how far one exam can push your grade. Every point on the final is worth w points of course grade, so on a 25% final, ten extra points on the exam add 2.5 points to the course.
| Current grade | Final weight | Course grade with a 0 | With a 100 | Needed for 80% |
|---|---|---|---|---|
| 84% | 10% | 75.6% | 85.6% | 44% |
| 84% | 25% | 63% | 88% | 68% |
| 84% | 40% | 50.4% | 90.4% | 74% |
| 72% | 25% | 54% | 79% | 104% |
The floor and ceiling in the results panel are worth a look before you start studying. If your ceiling is below your target, the final alone cannot get you there, and it is time to ask about extra credit or a retake policy. If your floor is above it, your grade is safe, though many schools require you to sit the exam anyway.
When the simple formula does not fit
Read your syllabus closely if any of these apply. Each one changes the math:
- The final is part of a category. If “Exams” is 50% and the final is one of four exams, the final is not worth 50%. Work out its share, for example 50% ÷ 4 = 12.5% if all exams count equally, or recalculate the category with the final included.
- Other work is still ungraded. The calculator assumes remaining projects or homework come in at your current average. If you expect to do better or worse on them, adjust your current grade.
- Dropped scores and replacement rules. Some classes drop the lowest quiz or let a strong final replace a weak test. Apply those first.
- Rounding and curves. An 89.5 may round to an A−, or it may not. A curve can change everything. Ask your instructor rather than guessing.
- Minimum final score. Some courses require a passing score on the final regardless of your average.
Once you know your projected course grades, the weighted GPA calculator shows what they do to your GPA.
Sources & assumptions
How this calculator gets its numbers. Full method: our methodology.
- Your current grade covers everything except the final, so course grade = current × (1 − final weight) + final score × final weight.
- Needed on final = (target − current × (1 − final weight)) ÷ final weight.
- In category mode, the current grade averages only the categories that have grades, weighted by their syllabus share, the way Canvas computes a “current grade”. Ungraded categories other than the final are assumed to come in at your current average.
- Letter cutoffs default to 90/80/70/60. Change them if your syllabus uses another scale.
- No rounding, curving, dropped scores or minimum-final rules are applied.
Sources
- Instructure Community (Canvas), How do I weight the final course grade based on assignment groups?. Course grade = Σ(group percentage × group weight); groups with nothing graded are left out and the rest are divided by their combined weight (the 90.1% and 91.43% examples).
- The Ohio State University, Teaching and Learning Resource Center, Calculate Final Grades. The difference between Canvas’s “current grade” (graded work only) and a total that counts missing work as zero.
- University of Calgary, Student Success Centre, How to Calculate your Grades Tip Sheet. Worked example: 55 points banked before a 30% final; a goal of 80 needs 25 of 30 points, or 83.33% on the final.
Last reviewed . Your syllabus and your instructor decide how the final counts; check both before you plan around the number.
Frequently asked questions
What do I need on my final to get an A?
Use 90% as the target if your class uses a standard 10-point scale. For example, with an 86% now and a 30% final, you need (90 − 86 × 0.70) ÷ 0.30 = (90 − 60.2) ÷ 0.30 = 99.3%. The letter table in the results shows the score for an A, B, C and D at once.
What if the score I need is over 100%?
Then the final alone cannot get you to that grade, because even a perfect score leaves you short. Look at the ceiling figure to see the highest grade you can still reach, and ask your instructor whether extra credit, a retake or a replacement policy is available.
What if the result is zero or negative?
Your target is locked in: even a 0 on the final would leave you at or above it. The floor figure shows your course grade with a 0. Many schools still require you to take the exam, and skipping it can carry its own penalty, so check before you plan on it.
How do I find the weight of my final exam?
It is listed in the grading section of your syllabus, usually as a percentage. If the final is one of several exams in a single category, divide the category weight among them according to how they are counted. Your instructor or your course page can confirm it.
My class uses points, not percentages. Does this still work?
Yes. Divide the points you have earned by the points possible so far to get your current grade, and divide the final’s points by the total course points to get its weight. For a 1,000-point course where the final is worth 200 points, the weight is 20%.
Why does my gradebook show a different current grade?
Gradebooks such as Canvas only average work that has been graded, and they may not count missing assignments as zeros until your teacher enters them. Category weights, dropped scores and extra credit also change the number. Use the category mode with your syllabus weights to see how the figure is built.