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Final grade calculator
Coming into the last exam of a course, the useful question is rarely what you have scored so far; it is what you still need to score to land where you want.
This is the score the final exam must reach for your overall grade to hit the target, given how much of the grade the final carries.
This calculator answers exactly that. Tell it your current grade in the course, how much the final exam is worth as a share of the whole grade, and the overall grade you are aiming for, and it returns the mark the final must reach for the target to fall out. The logic is a weighted average run backwards. Your final overall grade is a blend of two parts: the work already done, which is fixed, and the final exam, which is not. If the final is worth, say, 30 percent of the course, then the other 70 percent is already banked at your current grade, and the final supplies the missing 30 percent. The overall grade is your current grade times 0.70 plus the final score times 0.30. Set that equal to the target and the only unknown is the final score, so rearranging gives the score needed: the target minus your current grade times the non-final share, all divided by the final share. The calculator does that rearrangement and hands back a single percentage. Reading the result is where it earns its keep. If the number comes back at a comfortable level, you know the cushion you have and can plan revision accordingly. If it comes back above 100, the target is out of reach from the final alone: the work already banked weighs the average down too far for even a perfect paper to drag it up, and the honest options are extra credit, a regrade, or a lower target. The tool flags that case rather than pretending a 105 percent is achievable. At the other end, if the number is zero or below, the target is already secured: you have done enough that any score on the final, even a blank paper, keeps the overall grade at or above the goal, and the calculator shows the floor you would land on if you scored nothing at all. That is worth knowing too, since it tells you where the safety net sits, though aiming higher still pulls the final grade up. Two assumptions keep the figure clean. First, it treats the final as the only graded item left, with everything else locked in at your current mark. If you still have other coursework outstanding, group their combined share together as the final weight and enter your expected average on them as the score you are solving for, or run the tool once the earlier marks are in for a sharper answer. Second, it works in straight percentages, so if your course grades on points or a letter scale, convert to a percentage first and convert the answer back. People use this to set a realistic revision goal before a final, to find out whether a borderline pass is still mathematically on, to see how much room a strong term has bought them, and to decide where to spend limited study time across several subjects by comparing the score each one still demands.
How it works
- Enter your current overall grade in the course as a percentage.
- Enter the overall grade you are aiming for.
- Enter how much the final exam is worth, as a percentage of the whole grade.
- The tool treats the rest of the grade as fixed at your current mark.
- It solves the weighted average for the final score that hits your target.
needed = ( target - current x (1 - weight) ) / weight
The overall grade is a weighted average of the work already done and the final exam. The banked work contributes the current grade times the share of the grade that is not the final, which is one minus the final weight. The final contributes its own score times the final weight. Setting the sum equal to the target and isolating the final score gives the formula. A result above 100 means the target cannot be reached from the final alone; a result at or below 0 means it is already secured.
- current
- your current overall grade in the course, as a percentage
- target
- the overall grade you want to finish on
- weight
- the final exam share of the grade, as a fraction (40% = 0.40)
Score needed at 80 now, target 85
| Final worth 20% | 105% (not reachable) | too light to close the gap |
| Final worth 30% | about 96.7% | very demanding |
| Final worth 40% | 92.5% | hard but possible |
| Final worth 50% | 90% | a heavier final helps |
Worked example
You are on 82 percent, the final is worth 40 percent of the course, and you want to finish on 85 percent overall: the banked 60 percent of the grade holds your 82, contributing 49.2 points, so the final must supply the rest: (85 minus 49.2) divided by 0.40, which is 89.5 percent. Drop the target to 80 and the needed score falls to 71.5; raise the final weight to 50 percent and the same 85 target needs only 88, since the heavier final can move the average more.
Key facts
- The overall grade is a weighted average of banked work and the final.
- A heavier final can move the overall grade more, so it can need a lower score.
- A needed score above 100 means the target is out of reach from the final alone.
- A needed score of zero or below means the target is already secured.
Tips
- Read the final weight straight off your syllabus rather than guessing it.
- If other coursework remains, lump its weight in and read the answer as an average.
- Leave a small margin above the figure for how your course rounds grades.
- Compare the needed score across subjects to aim revision where it counts most.
Frequently asked questions
What does "final exam weight" mean?+
It is the share of your overall course grade that the final exam decides, written as a percentage. A syllabus that says the final is worth 30 percent means the other 70 percent comes from coursework, tests and participation already graded. Enter that 30 here; it controls how much a given final score can move your overall grade.
Why does it say the grade is not achievable?+
When the needed score comes out above 100, even a perfect final cannot lift the overall grade to your target, because the work already banked weighs the average down too far. The lighter the final and the bigger the gap between your current grade and the target, the more likely this is. Realistic routes are extra credit, a regrade of earlier work, or a lower target.
It says the target is already secured. What does that mean?+
The needed score came out at zero or below, so you have done enough that any final score, including a blank paper, keeps the overall grade at or above your target. The tool shows the grade you would land on if you scored nothing. Sitting the final well still pulls the final figure higher, so it is worth the effort.
I still have other coursework left, not just the final. Can I use this?+
Yes, with a tweak. Add up the combined weight of everything still outstanding and enter that total as the final weight, then read the result as the average you need across all of it, not one exam. For a sharper answer, run the tool again once the earlier marks post and only the final is left.
My course uses letter grades or points, not percentages. Does it still work?+
The maths is the same, but you have to convert. Turn your current grade, your target and the final weight into percentages, read the needed score as a percentage, then convert it back to your course scale. Keep the conversion consistent across all three inputs so the weighted average lines up.
Does this account for grades being rounded at the end?+
No, it solves to the exact percentage. If your course rounds the final grade up at a half point, you may need a touch less than the figure shown; if it truncates, you may need a touch more. Treat the result as the clean target and leave yourself a small margin for how your institution rounds.
Things to watch
- It assumes every grade except the final is already fixed at your current mark.
- Convert letter or points grades to percentages first, then convert the answer back.
- A target needing over 100 percent is a signal to seek extra credit, not to panic.
Last updated: 2026
This is an estimate for general guidance, not financial, tax, legal or medical advice. Figures can change and individual circumstances vary. Always confirm with an official source before making decisions.
Built and maintained by Vikas Dulgunde. Editorial standards.