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Final Exam Calculator
Enter your current grade, the grade you’re aiming for, and how much the final is worth — and see the exact score you need, plus what every possible final score leaves you with.
Short answer
To find the score you need on your final, subtract your current grade × (1 − the final’s weight) from your target, then divide by the weight: needed = (target − current × (1 − weight)) ÷ weight. So with an 88% now and a final worth 30%, reaching a 90% overall needs 94.7% on the final — because 88 × 0.70 = 61.6 points are already banked and the final can only move the last 30%.
How we calculate this
Your class grade is a weighted blend of the work you've done and the final exam. This tool applies that arithmetic exactly and solves it for the score you need:
- Split your grade into what's banked and what's left. If the final is worth 30% of your grade, everything else is worth the other 70%. Your current grade already reflects that 70%, so it's 'banked' — the final can only move the remaining 30%.
- Blend the two by the final's weight. Overall = current × (1 − weight) + final × weight. With an 88% going in and a final worth 30%, 88 × 0.70 = 61.6 points are locked in before you sit the exam.
- Solve for the score you need. Rearranged, needed final = (target − banked) ÷ weight. To reach a 90% overall from that 88%, you'd need (90 − 61.6) ÷ 0.30 = 94.7% on the final.
- Check it's actually reachable. If the answer is above 100%, the target is out of reach and the tool tells you the best you can still finish with. If it's zero or below, you've already secured the target — even a blank final keeps you there.
Assumptions
- Your 'current grade' already accounts for every graded item except the final, weighted the way your syllabus weights them. Read it off your course portal, not a hand-average.
- The final's weight is the share of your overall grade it carries — check the syllabus, since exams, homework, and participation are often weighted differently.
- Percentages assume percentage-based grading. If your class is scored in raw points, use the points-based calculator instead.
- Letter-grade and GPA conversions use the most common US scale with A+ capped at 4.0; your registrar's published scale is authoritative.
- Everything is computed in your browser. Nothing is uploaded or stored.
Sources
Last reviewed: July 18, 2026
How far a final can move an 85% grade
| Final is worth | If you ace it (100) | If you bomb it (50) |
|---|---|---|
| 10% | 86.5 | 81.5 |
| 20% | 88 | 78 |
| 30% | 89.5 | 74.5 |
| 40% | 91 | 71 |
| 50% | 92.5 | 67.5 |
The heavier the final, the more it can swing your grade — in both directions. Enter your own numbers above to see your exact range.
Standard US letter-grade scale
| Letter | Percentage | GPA points |
|---|---|---|
| A+ | 97–100 | 4.0 |
| A | 93–96 | 4.0 |
| A- | 90–92 | 3.7 |
| B+ | 87–89 | 3.3 |
| B | 83–86 | 3.0 |
| B- | 80–82 | 2.7 |
| C+ | 77–79 | 2.3 |
| C | 73–76 | 2.0 |
| C- | 70–72 | 1.7 |
| D+ | 67–69 | 1.3 |
| D | 63–66 | 1.0 |
| D- | 60–62 | 0.7 |
| F | Below 60 | 0.0 |
The most common US convention, with A+ capped at 4.0. Schools vary — some award 4.3 for an A+, some don't use minus grades — so check your syllabus. Cut-offs are the boundaries most registrars publish.
Related tools
What grade do I need on my final?+
Take the overall grade you want, subtract your current grade times the share it's already worth, then divide by the final's weight. Needed final = (target − current × (1 − weight)) ÷ weight. For example, with an 88% now and a final worth 30%, reaching a 90% overall needs a 94.7% on the final. This calculator does the arithmetic and tells you whether the number is actually reachable.
How is my final grade calculated?+
Your class grade is a weighted average: everything you've done so far counts for one share, and the final counts for the rest. If the final is worth 30%, your current grade is locked in at 70% weight and the final can only move the remaining 30%. Overall = current × (1 − weight) + final × weight.
What if I get a 100 on the final — what's the highest I can get?+
Enter your current grade and the final's weight and the tool shows the best you can finish with (a perfect final) and the worst (a zero). The heavier the final, the wider that range. A final worth 20% can move an 85% grade between 68% and 88%.
Is this the same as the RogerHub final grade calculator?+
It does the same core job — solving for the score you need on the final — plus a points-based mode, a weighted-grade explainer, and a table showing exactly how each possible final score changes your overall grade. Everything runs in your browser with no signup.
Do I use my current grade or my current average?+
Use the current overall grade shown in your course portal, because it already weights homework, quizzes, and midterms the way your syllabus does. A plain average of your assignment scores can be off if categories are weighted differently.
Is my data saved or sent anywhere?+
No. Everything is computed in your browser — nothing is uploaded, and there's no signup or email wall. The share link encodes your numbers in the URL itself, so you control who sees it.