Free final grade calculator
Wondering what you need on your final? Enter your current grade, how much the final exam is worth, and the course grade you're aiming for — this final grade calculator solves the weighted-average formula and shows the exact score you need on the final to hit your target, updated live, as you type.
On this page12 sections
Weighted average of assignment scores. Weights should total 100% for an accurate overall grade.
Results are estimates. Consult a professional.
What is a final grade calculator?
A final grade calculator answers the question every student asks before exam week: "what do I need on my final?" Enter your current grade in the class, how much the final exam is worth, and the overall course grade you're aiming for, and it returns the exact score you need on that final exam to hit your target.
It works backwards from the weighted-average formula every syllabus uses. Your course grade is a blend of everything you've already done and the final exam still to come. Because the final's weight is fixed, the only unknown is your final-exam score — and that's what this calculator solves for, updating instantly as you change any input.
How final exam weighting works
When a professor says "the final is worth 30% of your grade," they mean your course grade is a weighted average: everything before the final counts for the remaining 70%, and the final counts for 30%. Nothing else changes that split.
Two things follow from this. First, the heavier the final, the more it can move your grade — both up and down. A final worth 50% can rescue (or sink) a course far more than one worth 10%. Second, your current grade is already "banked" at its (1 − weight) share, so a strong record going in lowers the score you need on the final. To average your existing scores first, use the grade calculator.
The final grade formula: what you need on the final
To find the score you need on the final, rearrange the weighted-average formula to solve for the final score. Start from the course-grade equation and isolate the one unknown:
In plain words: take your target, subtract the part of it your current grade already covers, then divide what's left by the final's weight. The smaller the final's weight, the larger that division blows up the gap — which is why a light final makes an ambitious target hard to reach, and a heavy final gives you more room to climb.
A worked example using the final grade calculator
Maya has an 85% in the class. The final exam is worth 30% of the grade, and she wants to finish with a 90% overall. These are the calculator's default inputs — here's exactly how it works through them.
Step 1 — Find what's already locked in
The final is worth 30%, so 70% of the grade is already decided by her 85. That banked portion is 85 × 0.70 = 59.5 grade-points toward the final course grade.
Step 2 — Subtract that from the target
Her target is 90. Subtract the banked 59.5: 90 − 59.5 = 30.5. That's the share of the target the final exam still has to deliver.
Step 3 — Divide by the final's weight
Divide 30.5 by the weight (0.30): 30.5 ÷ 0.30 = 101.666…, which the calculator rounds to 101.7%. Because that's above 100%, a 90 isn't reachable from an 85 when the final is only worth 30% — even a perfect 100 on the final wouldn't be enough.
A reachable version of the same goal
If the final were worth 40% instead of 30% (same 85 current, same 90 target), the calculator returns: (90 − 85 × 0.60) ÷ 0.40 = (90 − 51) ÷ 0.40 = 39 ÷ 0.40 = 97.5%. Now the 90 is reachable — a 97.5 on the final gets her there. The heavier final gave the score room to count.
What if I need more than 100% on the final?
When the calculator returns a number above 100%, the target isn't reachable with the final exam alone — there's no score high enough. This isn't a glitch; it's the math telling you the gap between your current grade and your goal is larger than the final's weight can close.
The highest possible course grade you can finish with is your current grade kept on its banked share plus a perfect 100 on the final. The table below shows that ceiling for a few combinations — anything above the ceiling needs you to change the target, not the study plan.
| Current grade | Final weight | Best possible (final = 100) | Reachable targets |
|---|---|---|---|
| 85 | 10% | 86.5 | Up to 86.5 |
| 85 | 20% | 88.0 | Up to 88.0 |
| 85 | 30% | 89.5 | Up to 89.5 |
| 85 | 40% | 91.0 | Up to 91.0 |
| 85 | 50% | 92.5 | Up to 92.5 |
| 75 | 40% | 85.0 | Up to 85.0 |
Best possible = current × (1 − weight) + 100 × weight. A target above this number can't be reached even with a perfect final. Lower the target or note that a heavier final raises the ceiling.
Common letter-grade targets
Most courses map percentage grades to letters on a standard US scale. Picking a target percentage usually means picking the bottom of a letter band — the minimum that still earns that letter. Use this as your target grade input.
| Letter | Percentage range | Typical target to enter |
|---|---|---|
| A | 93–100% | 93 |
| A− | 90–92% | 90 |
| B+ | 87–89% | 87 |
| B | 83–86% | 83 |
| B− | 80–82% | 80 |
| C+ | 77–79% | 77 |
| C | 73–76% | 73 |
| D | 60–69% | 60 |
A common US letter-grade scale. Scales vary by school and instructor — always confirm the exact cutoffs and final-exam weight on your own syllabus.
Planning across several classes for the term? Convert each course grade to grade points and combine them with the GPA calculator, or browse the full set of student tools on the everyday calculators shelf.
Common final grade questions
What do I need on my final to pass?
Set your target to your school's passing percentage (often 60% for a D, or 70% for a C, depending on the course). Enter your current grade and the final's weight, and the calculator returns the minimum final-exam score that keeps you at or above that line.
My final is worth 30% — how do I use that?
Enter 30 in the final exam weight field. The calculator treats your current grade as 70% of the course and the final as the remaining 30%, then solves for the final score that lands you on your target.
Why does it say I need more than 100%?
Because your target is higher than the best grade you can finish with. The maximum is your current grade times its banked share plus a perfect 100 on the final. If your goal sits above that ceiling, no final score can reach it — lower the target or check whether the final's weight is really that small.
Is my current grade before or after the final?
Before. Enter the grade you have right now, with the final exam not yet counted. The calculator adds the final's contribution itself, so including it would double-count.
How this calculator works and sources
This final grade calculator solves the standard weighted-average grade equation for the one unknown — your final-exam score — using needed = (target − current × (1 − weight)) / weight, with the weight entered as a percent and converted to a decimal. The arithmetic runs entirely in your browser; nothing is sent anywhere. The formula and the worked example (85 current, 40% final, 90 target → 97.5 needed) match the established final-grade calculators below.
CalculatorSoup — Final Grade Calculator (required-final-score formula).Omni Calculator — Final Grade Calculator (weighted-average method and examples).RapidTables — Final Grade Calculator (Required = (Goal − Current × (100% − Final Weight)) / Final Weight).Frequently asked questions about the free final grade calculator
About this final grade calculator
This final grade calculator runs entirely in your browser. It takes your current grade, the final exam's weight, and your target course grade, then solves the weighted-average grade formula for the one unknown — the score you need on the final. Nothing you type is sent anywhere, and the result recalculates instantly as you adjust any input.
Need related tools? Average your completed scores with the grade calculator, combine course grades into a GPA, browse more student tools on the everyday calculators shelf, or see the full calculators directory.