Your average on everything except the final exam — your gradebook's "current grade" figure.
From your syllabus. Common values run from 10% to 40%; if the syllabus gives points instead, use final points ÷ total points × 100.
Uses the same current grade and final weight from above.
Very tough. A 98.0% is a near-perfect exam — possible, but everything has to go right. It is worth knowing now, while there is still time to study like it.
Assumes your current grade covers everything except the final, weighted the way your syllabus weights it. Teachers who curve or drop scores change the outcome — this is the un-curved math.
How to work out what you need on your final
1. Find your current grade — your average on everything except the final exam. Your course gradebook usually shows this as your current or running grade.
2. Pick your target — the overall course grade you want when the final is counted: 90% for an A, 80% for a B, and so on.
3. Find the final's weight in your syllabus — the percentage of your total course grade the exam decides. Most finals are worth 10% to 40%.
4. Do the math below — or just type the three numbers into the calculator above and read the answer.
The formula, in plain English
Your course grade is a weighted average of two parts: the work you have already done, and the final exam. If the final is worth w of the course, everything else is worth 1 − w — so the final score you need is:
needed = (target − current × (1 − w)) ÷ w
Run the example this page opens with: current grade 88%, target 90%, final worth 20% (so w = 0.20). Your current work locks in 88 × 0.80 = 70.4 of the 90 points you want. That leaves 90 − 70.4 = 19.6 points the final must supply — out of the 20 points it controls. 19.6 ÷ 0.20 = 98.0%. The final only decides a fifth of your grade, which is why the score you need can be so much higher than the grade you want: the exam has to make up the whole gap using only its small slice.
What you need, at a glance
Suppose your current grade is 85% and the final is worth 20%. Your current work banks 85 × 0.80 = 68.0 points, and the best you can possibly finish with is 68.0 + 20 = 88.0%. Here is what each target demands:
| You want | You need on the final | Verdict |
|---|---|---|
| An A (90%) | 110.0% | Not possible — even a perfect final tops out at 88.0% |
| A B (80%) | 60.0% | Achievable — a score well below your current average |
| A C (70%) | 10.0% | Very comfortable — just showing up nearly does it |
| A D (60%) | Secured | Already locked in — a 0% on the final still leaves you at 68.0% |
The weight of the final decides how much any of this can move. Same student — current grade 85%, target 90% — different weights:
| Final is worth | Score needed for 90% | Best possible finish |
|---|---|---|
| 10% | 135.0% | 86.5% |
| 20% | 110.0% | 88.0% |
| 30% | 101.7% | 89.5% |
| 40% | 97.5% | 91.0% |
A heavier final is a bigger risk and a bigger opportunity: at 40% the A becomes reachable, because the exam controls enough of the grade to close the gap. At 10% or 20%, this student's A was decided weeks ago — the honest answer the calculator gives, and the reason to run it early in the term rather than the night before.
The reverse question: "what will I end up with?"
Once you know the score you need, the follow-up is what a realistic score does to you. That is the same weighted average, forward instead of backward: course grade = current × (1 − w) + final score × w. With a current grade of 88% and a final worth 20%, scoring 95% on the exam gives 88 × 0.80 + 95 × 0.20 = 70.4 + 19.0 = 89.4% — painfully close to an A, and exactly the kind of number worth knowing before you decide how the last study weekend gets spent. The reverse box in the calculator answers it for any score you type.
And if you want the same math for your whole semester rather than one course, the GPA calculator combines every course — and every previous term — into one number.
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Frequently asked questions
What do I need on my final to get an A?
It depends on your current grade and the final's weight. The formula is: needed = (90 − current × (1 − w)) ÷ w, where w is the final's weight as a decimal. With a current grade of 88% and a final worth 20%, you need (90 − 70.4) ÷ 0.20 = 98.0% — a near-perfect exam. With a current grade of 95% and the same 20% weight, you would need only 70.0%. Type your own numbers into the calculator above for your exact answer.
How is my final course grade calculated?
As a weighted average: course grade = current grade × (1 − w) + final score × w, where w is the final's weight. If your current grade is 88%, the final is worth 20%, and you score 95% on it, your course grade is 88 × 0.80 + 95 × 0.20 = 89.4%. The weight is what students underestimate — a 20% final can only move your grade by a fifth of the distance between your current grade and your exam score.
Can I still get an A?
Yes, if the score you need is 100% or less. Compute it: if the needed score comes out above 100%, the A is mathematically out of reach (without extra credit or a curve) — for example, a current grade of 85% with a 20% final tops out at 88.0% even with a perfect exam. If it comes out at 100% or below, the A is alive, though anything above about 90% needed means a near-perfect paper. This calculator tells you which situation you are in honestly, including the maximum grade still available to you.
What if the score I need is over 100%?
Then the target grade cannot be reached through the final alone — no score exists that gets you there, because the exam does not control enough of the course grade. Your best possible finish is current × (1 − w) + 100 × w; the calculator shows it as your "highest possible course grade." Practical moves: aim at the next grade down and secure it properly, ask your teacher whether extra credit exists, and check whether the exam itself is curved — a curve is the one thing that can rescue an impossible number, and it is never guaranteed.
How much is my final exam worth?
Your syllabus states it — look for the grading breakdown, usually a list like "Homework 20%, Midterm 30%, Final 30%." Typical finals are worth 10% to 40% of the course grade. If your syllabus works in points instead of percentages, divide the final's points by the course's total points and multiply by 100: a 200-point final in a 1,000-point course is worth 20%. If part of the course is still ungraded besides the final, its weight belongs with the final's slice, not your current grade's.
What should I enter as my current grade?
Your average on everything except the final exam, weighted the way your syllabus weights it — most online gradebooks show exactly this as your current grade. Two traps: if your gradebook's percentage treats the final as a zero already, it will understate you (look for a "grade excluding final" or compute from the category weights); and if assignments besides the final are still outstanding, this calculator assumes they come in at your current average — enter a lower current grade to see the pessimistic case.