Final exam calculator
Pick a score for your final and see exactly where your course grade lands.
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Your result
Your course grade would be
87.1%
if you score 85% on the final exam.
Scoring 85% on the final would lower your course grade by 0.9 percentage points, because the exam carries 30% of the total.
- Coursework contributes
- 61.6 pts
- The final contributes
- 25.5 pts
- Change from your current grade
- -0.9 pts
Show the maths
Formula
Projected course grade = current grade × (1 − final weight) + final exam score × final weight, with the weight written as a decimal.
With your numbers
88 × 0.7 + 85 × 0.3 = 61.6 + 25.5 = 87.1
Calculated at full precision and rounded only for display, so the figure above may differ in the last decimal place from a calculator that rounds at each step.
How the status labels are decided
- Already secured: You reach the target even with a zero on the final.
- Comfortable: Needs 70% or less of the maximum score.
- Achievable: Needs more than 70% and up to 85% of the maximum score.
- Stretch: Needs more than 85% and up to 95% of the maximum score.
- Very difficult: Needs more than 95%, up to and including a perfect score.
- Impossible without extra credit: Needs more than the maximum score obtainable on the final.
These labels describe how demanding a score is, not any school’s grading policy.
Your course grade would be 87.1%. Scoring 85% on the final would lower your course grade by 0.9 percentage points, because the exam carries 30% of the total.
Try different final exam scores
Move the slider to see where any exam score leaves your course grade. The markers show the score at which you cross each grade boundary on the US letter with +/− scale.
Projected course grade
87.1%B+
with 85% on the final
0%100%
You cross 90% at 94.67% on the final.
| Exam score | Course grade | Letter | Target |
|---|---|---|---|
| 0% | 61.6% | D- | Short |
| 50% | 76.6% | C | Short |
| 60% | 79.6% | C+ | Short |
| 70% | 82.6% | B- | Short |
| 80% | 85.6% | B | Short |
| 90% | 88.6% | B+ | Short |
| 100% (the maximum score) | 91.6% | A- | Met |
How much your final is really worth
Students routinely overestimate how much a final can rescue a grade, and underestimate how much it can dent one. Both errors come from the same place: thinking about the exam score instead of the exam’s weight.
The rule is simple. Every point you score above your current grade lifts your course grade by that point multiplied by the weight, and every point below drags it down the same way. On a 20% final, a score 10 points above your average adds 2 points to your course grade. On a 50% final, the same 10-point gap adds 5.
Which means the honest question before an exam is not “can I ace this?” but “how far above my average do I need to land, and is that a realistic distance?” The table below answers that for a student sitting at 84%.
| Exam score | Final worth 15% | Final worth 30% | Final worth 50% |
|---|---|---|---|
| 60% | 80.4% | 76.8% | 72% |
| 75% | 82.65% | 81.3% | 79.5% |
| 84% | 84% | 84% | 84% |
| 95% | 85.65% | 87.3% | 89.5% |
| 100% | 86.4% | 88.8% | 92% |
The row at 84% is the one to notice: whatever the weight, scoring exactly your current average leaves the grade untouched. That is the break-even line, and everything above or below it moves in proportion to the weight.
Using a projection to plan
A projection is most useful when you run it three times — pessimistic, realistic, optimistic — and look at the spread rather than any single figure. If all three land in the same letter band, the exam is not where your attention should go. If they straddle a boundary, you now know precisely what is at stake and where the line sits.
When you want the reverse — a target grade and the score that reaches it — use what grade do I need on my final. The two calculations are the same equation rearranged, so they will always agree.
Related calculators
- Final Grade CalculatorBoth directions: the score you need, and the grade you would end up with.
- What Grade Do I Need?Target-first flow for the single question: what score gets me there?
- Weighted Grade CalculatorTurn a syllabus of categories or a list of assignments into one grade.
- Grade Percentage CalculatorPoints to percentage to letter, and back again.
Frequently asked questions
- How much can one exam actually move my grade?
- By at most its weight. A final worth 25% can move your course grade by 25 percentage points in the best case — from your current grade with a zero, to your current grade with a perfect score. In practice the realistic swing is far smaller: scoring 20 points above your current average on a 25% final moves the course grade by 5 points.
- Why does my grade barely change when I raise my expected score?
- Because the exam's weight is small. Every point you add to the exam score adds only that point multiplied by the weight. On a 15% final, ten extra exam points are worth 1.5 points of course grade. The slider makes this visible: a low weight produces a nearly flat line.
- Can my course grade go down after the final?
- Yes, whenever you score below your current grade. If you are at 91% and score 80% on a 30% final, the course grade lands at 87.7%. This is the most common surprise in the whole calculation, and it is why predicting is worth doing before the exam rather than after.
- What should I enter as my expected score?
- Try three: what you would get on a bad day, what you realistically expect, and what you would get at your best. The gap between the first and the last is the range your course grade will land in — which is far more useful than a single guess, and it takes about ten seconds with the slider.
- Does this work for a midterm rather than a final?
- Yes. Nothing in the arithmetic is specific to a final exam — it works for any single assessment where you know the weight and everything else has been graded. Enter the midterm's weight in place of the final's. If several pieces of work are still outstanding, use the weighted grade calculator instead.
Privacy and accuracy
Every calculation runs in your browser. Your grades are never sent to a server, there is no account, and there is nothing to sign up for. Read the privacy policy for exactly what is stored on your device.
The arithmetic is exact, but the answer is only as good as the numbers you enter. Weights, rounding rules and drop policies vary between courses, so check your syllabus — and remember that your learning platform may round differently from the figure shown here.