Final Grade Calculator
The score you need on the final, and whether it is reachable.
Work out Final Grade. The score you need on the final, and whether it is reachable. Exact arithmetic, checked against published values.
This assumes a straightforward weighted average. Dropped lowest scores, curves, extra credit and separate pass marks on the final itself all change the answer, and they are common enough that the syllabus is worth checking before relying on this.
Score needed on the final
101.7%
A perfect final gives 89.5% — below your 90% target
The arithmetic gives 101.7%, which is not a score anyone can achieve. A final worth 30% simply cannot move a 85% term average to 90% — the highest reachable grade is 89.5%. That is worth knowing now rather than after the exam.
How the Final Grade Calculator works
The score needed on a final exam to reach a target grade, given the term work already banked and the final's weight. The weight does all the work: a final worth 20% cannot rescue a poor term, and the arithmetic says so by returning a figure above 100. That is worth knowing before the exam rather than after it.
Also known as: what do I need on my final · final exam grade calculator · grade needed on final calculator · what grade do I need to pass
The calculation itself
needed = (target − current × (1 − weight)) ÷ weight.
The term work already completed is banked at its own weight. Whatever remains of the target has to come from the final, and dividing by the final's weight converts that remainder into a score on the exam itself.
In practice
An 85% average, a 90% target and a final worth 30% requires 101.67% — which nobody can score. The honest answer is that the target is out of reach, and the page says so rather than printing an impossible number as though it were a plan.
The same student's grade will land somewhere between 59.5% and 89.5%: 59.5% if they score zero on the final, 89.5% with a perfect paper. The 90% target sits just outside that range.
Change the final's weight to 50% and the same target needs 95% — hard, but possible. Nothing about the student changed; only how much of the grade the exam controls.
The weight is the whole story
A final can only move the overall grade by its own weight times the gap. A 20% final applied to a term average five points short of target can close at most one point of that gap even with a perfect score.
This is worth knowing in week one rather than the night before. If the target matters, the time to act is while the coursework that carries 70 or 80% of the grade is still being marked.
It also cuts the other way: a strong term average can make the target unreachable to lose. The page reports that case too, since knowing the final cannot hurt you is as useful as knowing it cannot save you.
What this assumes
A straightforward weighted average, with no adjustments. That is often not what a syllabus actually specifies.
Dropped lowest scores, curves, extra credit and a separate minimum pass mark on the final itself are all common, and each changes the answer. A course that drops your lowest quiz has a current average that is not yet final; a course with a hard pass mark on the exam can fail a student whose weighted total is comfortable.
Check the syllabus before making a decision on this number. The arithmetic here is exact; the model behind it is the assumption worth verifying.
Frequently asked questions
What do I need on my final?
needed = (target − current × (1 − weight)) ÷ weight. With an 85% average, a 90% target and a final worth 30%, you need 101.7% — which is out of reach, and the page says so rather than printing an impossible number as though it were a plan.
Why is the number above 100?
Because the target cannot be reached. The final's weight limits how far it can move the total: a final worth 30% can only shift the overall grade by 30% of the gap, however well it goes.
What is the highest grade I can still get?
Your banked term work plus the final's full weight. An 85% average with a 30% final caps out at 89.5% even with a perfect score.
How much does the final's weight matter?
More than anything else here. The same 85% average and 90% target needs 101.7% when the final is worth 30%, but only 95% when it is worth 50%. Heavier finals cut both ways.
Does this handle dropped scores or a curve?
No. It assumes a straightforward weighted average. Dropped lowest scores, curves, extra credit and separate pass marks on the final are all common enough that the syllabus is worth checking before relying on this.
What if I have already secured my target?
The page will say so. If your banked term work alone meets the target, the final cannot take it away — though a separate minimum pass mark on the final may still apply.
Put this calculator on your own site
Free to use, on any site, commercial or not. Paste this where you want it to appear. It is a plain iframe, so it works in WordPress, Squarespace, Wix, Webflow, Ghost and anything else that accepts HTML.
<iframe src="https://www.thecalclibrary.com/embed/final-grade-calculator" width="100%" height="640" style="border:1px solid #e2e8f0;border-radius:12px" loading="lazy" title="Final Grade Calculator"></iframe>The only condition is that the credit line stays visible. It sits inside the frame, so you do not have to do anything to keep it.