Final Grade Calculator
Enter your current grade, your final exam's weight, and the overall grade you're aiming for to see exactly what score you need on the final. Includes a grading-scale table and a reverse calculator for checking a hypothetical score.
Required final exam score
Calculations run locally in your browser — nothing you enter is sent to a server.
Score needed for each letter grade
Based on the current grade and final exam weight entered above.
| Grade | Overall % | Score needed on final |
|---|
Reverse mode: what's my overall grade?
How to use the final grade calculator
- Enter your current grade — the percentage you've earned in the course so far, not counting the final exam.
- Enter the final exam's weight — how much of your final course grade the exam counts for, as shown in your syllabus (for example, 20%).
- Enter the overall grade you want to end the course with.
- Read the result under "You need on the final exam." If it says the grade isn't reachable, the calculator shows the best overall grade you could still get with a perfect 100% final.
- Check the grade-scale table for the score needed for an A, B, C or D, or switch to "Reverse mode" to see what a specific hypothetical score would do to your overall grade.
How it works
Your final course grade is a weighted average of two parts: everything you've earned
before the final (your current grade) and the final exam itself. If w is the
final's weight written as a decimal (20% becomes 0.20), that relationship is:
overall = current × (1 − w) + final × w
This calculator solves the same equation for the one unknown that matters before exam day — the final exam score — given the overall grade you want:
required = (desired − current × (1 − w)) / w
Where current is your current grade, desired is your target
overall grade, and w is the final's weight as a decimal fraction of the
total course grade. This is the standard weighted-average grading formula used by most
US and UK school gradebooks and learning-management systems.
Assumptions and limits: "current grade" is treated as a single number that already combines everything except the final. The final is assumed to be scored on a normal 0–100% scale, with no extra credit, curve, or lowest-grade replacement (see below). A required score above 100% means the goal isn't mathematically reachable with a standard exam, so the calculator shows the best overall grade possible with a perfect 100% final instead. A required score at or below 0% means you've already secured that overall grade no matter what you score on the final.
Examples
Example 1 — not reachable. Current grade 85%, final worth 20%, target
90% overall.
required = (90 − 85 × 0.80) / 0.20 = (90 − 68) / 0.20 = 110%.
Since 110% is above 100%, a 90% overall isn't reachable on a standard exam. The best
possible overall grade with a perfect 100% final is
85 × 0.80 + 100 × 0.20 = 88%.
Example 2 — reachable, needs a strong score. Current grade 78%, final
worth 30%, target 80% overall.
required = (80 − 78 × 0.70) / 0.30 = (80 − 54.6) / 0.30 =
84.67%.
Example 3 — comfortably reachable. Current grade 70%, final worth 25%,
target 75% overall.
required = (75 − 70 × 0.75) / 0.25 = (75 − 52.5) / 0.25 =
90%.
How weights work
The "weight" of an assignment is the share of your final course grade it controls, and every category on a syllabus should add up to 100%. A final exam worth 20% means the other 80% comes from everything else you've already done. A typical syllabus weighting might look like this:
| Category | Weight |
|---|---|
| Homework | 15% |
| Quizzes | 15% |
| Midterm exam | 25% |
| Class participation | 5% |
| Final exam | 40% |
The "current grade" you enter above should already be the weighted average of every category except the final — most gradebooks (Canvas, Blackboard, PowerSchool, and similar platforms) calculate and label this for you as "current grade" or "grade so far." If yours doesn't, compute it yourself from the syllabus's category weights first.
What if the final replaces your lowest grade?
Some instructors let a strong final exam score replace your lowest quiz or test grade instead of simply being averaged in. This calculator doesn't model that directly, since it changes which assignments count toward your current grade. To use it anyway, recompute your "current grade" with the lowest assignment excluded, then enter that adjusted number here. A drop-the-lowest policy can only help, never hurt, so treat the required score shown here as a safe target — you may need slightly less in practice.
Study planning tips
- Start from your syllabus's official category weights, not just the exam's point value on a study guide.
- Recalculate as soon as a new grade posts (a midterm, a project) — your required score changes every time your current grade does.
- If the required score comes back above 100%, ask your instructor about extra credit or bonus questions before assuming the grade is out of reach.
- Divide study time by how heavily each topic appears on the final, not equally across every chapter you covered.
- Aim a few points above the required score for a margin of safety — exam-day scoring rarely lands exactly on target.
Frequently asked questions
How do I find my current grade for this calculator?
Check your school's gradebook or learning platform for your "current grade" or "grade so far" — it's usually already weighted by category and excludes the final exam. If your platform doesn't show one, calculate the weighted average yourself using your syllabus's category percentages.
What does it mean if the required score is over 100%?
It means the target overall grade can't be reached with a standard 0–100% final exam score, given your current grade and the exam's weight. The calculator shows the best overall grade possible with a perfect 100% final; without extra credit or a curve, you can't do better than that ceiling.
What if the required score is negative or zero?
You've already secured that overall grade, or better, no matter what you score on the final — even a 0%. If that seems surprising, double-check your current grade and the final exam's weight.
Does this account for extra credit or a curved final?
No. The calculator uses the standard weighted-average formula on a straight 0–100% scale. Extra credit, curves, and drop-the-lowest policies aren't included — adjust your current grade manually to approximate them, or ask your instructor how they affect your final score.
My school uses letter grades instead of percentages — can I still use this?
Yes. Convert letter grades to percentages using your school's official grading scale first (for example, A = 93–100%, A− = 90–92%, B+ = 87–89%), then enter the percentages here.
Is my grade data sent anywhere?
No. Every calculation runs locally in your browser with JavaScript; nothing you enter is transmitted to a server or stored anywhere unless you choose to.
This tool is for informational and study-planning purposes only. It is not a substitute for your official grade report — always confirm your grading policy and current grade with your instructor or school gradebook.
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