How to use this final exam score calculator
Three numbers decide what you need on your final: the grade you are carrying into the exam, how much the exam is worth, and the course grade you are aiming for. Enter them above and the answer updates as you type — no submit button, no sign-up.
Current grade is the running average your gradebook shows before the final is factored in. Final exam weight comes from the syllabus, usually written as something like "Final exam: 30%". Target course grade is the percentage you want to end with — 90% for an A on most 10-point scales, 80% for a B, 70% for a C.
The result is a minimum, not a prediction. Score exactly that number and you land on your target; score above it and you finish higher. If your class posts a letter grade rather than a percentage, the grade converter maps letters to the percentage ranges they represent.
The formula behind "what do I need on my final"
Needed score = ( Target − Current × ( 1 − Weight ) ) ÷ Weight
The logic is simpler than the notation. Your coursework already accounts for part of the final course grade — specifically, whatever share is not the final exam. If the final is worth 30%, then 70% of your course grade is already locked in at your current average.
So the calculation works in two steps. First, figure out how many points your coursework contributes: current grade × (1 − weight). Second, subtract that from your target to see how many points the final still has to deliver, then divide by the exam's weight to convert those points into an exam score.
Weight goes in as a decimal in the formula (30% becomes 0.30), but you can type it as a plain percentage above — the calculator converts it for you.
Example: 85% going into a final worth 30%
Current grade 85%, final exam worth 30%, target course grade 80%.
Coursework contributes 85 × 0.70 = 59.5 points toward the final course grade.
The final has to supply 80 − 59.5 = 20.5 points, so the score needed is 20.5 ÷ 0.30 = 68.33%.
Aiming for a 90% instead would require (90 − 59.5) ÷ 0.30 = 101.67% — above a perfect paper, so that target is out of reach with the final alone.
Score needed lookup tables
If you would rather not type anything, find your current grade in the left column and read across to your target. Each table covers a different final exam weight. "Not possible" means even a perfect final falls short; "Already secured" means you reach the target no matter how the exam goes.
Final exam worth 20% of your grade
| Current grade | Need for A (90%) | Need for B (80%) | Need for C (70%) |
|---|---|---|---|
| 70% | Not possible | Not possible | 70.0% |
| 75% | Not possible | 100.0% | 50.0% |
| 80% | Not possible | 80.0% | 30.0% |
| 85% | Not possible | 60.0% | 10.0% |
| 90% | 90.0% | 40.0% | Already secured |
| 95% | 70.0% | 20.0% | Already secured |
Final exam worth 30% of your grade
| Current grade | Need for A (90%) | Need for B (80%) | Need for C (70%) |
|---|---|---|---|
| 70% | Not possible | Not possible | 70.0% |
| 75% | Not possible | 91.7% | 58.3% |
| 80% | Not possible | 80.0% | 46.7% |
| 85% | Not possible | 68.3% | 35.0% |
| 90% | 90.0% | 56.7% | 23.3% |
| 95% | 78.3% | 45.0% | 11.7% |
Final exam worth 40% of your grade
| Current grade | Need for A (90%) | Need for B (80%) | Need for C (70%) |
|---|---|---|---|
| 70% | Not possible | 95.0% | 70.0% |
| 75% | Not possible | 87.5% | 62.5% |
| 80% | Not possible | 80.0% | 55.0% |
| 85% | 97.5% | 72.5% | 47.5% |
| 90% | 90.0% | 65.0% | 40.0% |
| 95% | 82.5% | 57.5% | 32.5% |
Targets assume a standard 10-point scale where 90% is an A, 80% a B, and 70% a C. If your school uses different cutoffs, type your own target into the calculator instead.
When your target is out of reach
A needed score above 100 is not a calculation error — it means the coursework portion of your grade has already used up too much of the target. The calculator responds by showing the best possible course grade: what you finish with if you score a perfect 100 on the final.
That number is worth knowing before exam week. If the best available outcome is an 87%, then studying toward a 90% is aiming at something that no longer exists, and a realistic target of 85% changes how you allocate study time across your classes.
It also tells you when the reverse is true. If the score needed comes out at or below zero, your target is locked in regardless of the exam — though most courses still require you to sit it.
Why a heavier final makes a comeback easier
Compare the tables above and a pattern shows up. Sitting at 75% and aiming for a B, you need a 100% when the final is worth 20%, a 91.7% when it is worth 30%, and only an 87.5% when it is worth 40%. The heavier the exam, the more ground a strong performance can recover.
The same leverage runs the other way. At 95% aiming for an A, a 20%-weighted final asks for a 70%, while a 40%-weighted final asks for an 82.5% — a bigger exam puts more of a strong average at risk.
This is why the exam weight in your syllabus matters as much as your current average. Two students with identical grades face very different exams depending on how the course is structured.
Related grade questions
This page answers one specific question: the score your final needs to reach. Related questions have their own tools. To build the current grade in the first place from homework, quizzes, and project categories, use the weighted grade calculator. To grade the exam itself once you have it back, the test grade calculator turns correct answers into a percentage.
The final grade calculator on the home page runs the same core calculation with a broader framing if you want to explore several scenarios at once. And once your course letter grade is settled, the GPA calculator folds it into your term GPA with credit hours applied.
Frequently asked questions
What grade do I need on my final?
Subtract the part of your target grade your coursework already covers, then divide the remainder by the final exam weight. The formula is: needed score = (target grade − current grade × (1 − final weight)) ÷ final weight.
How do I figure out what I need on my final if the exam is worth 30%?
With a current grade of 85% and a target of 80%, you need (80 − 85 × 0.70) ÷ 0.30 = 68.33% on the final. Enter your own numbers above to get the exact score for your class.
What if the score I need is above 100?
Then the target is out of reach even with a perfect final. The calculator tells you the highest course grade still available so you can set a realistic target instead.
Where do I find my current grade and the final exam weight?
Your current grade is the running average in your gradebook or learning management system. The final exam weight is listed in the course syllabus, usually as a percentage of the total course grade.
Does a heavier final exam help or hurt me?
It depends on where you stand. If you are behind your target, a heavier final gives you more room to catch up. If you are already above your target, a heavier final puts more of that lead at risk.
Is the score needed the same as the grade I will get?
No. The score needed is the minimum final exam result that reaches your target course grade. Scoring above it raises your course grade further; scoring below it lands you under the target.
Does this account for extra credit or a curve?
No. The calculation uses the weights published in your syllabus. Extra credit, curves, dropped assignments, and rounding rules are set by your instructor and can change the outcome.