It's the finals-week question in every class: "what do I need on the final?" This calculator answers it exactly. Plug in your current grade, how much of the course grade the final is worth, and the overall grade you're aiming for — it solves for the minimum exam score that gets you there, and tells you honestly when a target is already locked in or out of reach.
Instructions
Enter your current grade in the class, how much of your final course grade the exam is worth, and the overall grade you want. The calculator shows the minimum score you need on the final.
Current grade (%)
Final exam weight (% of course grade)
Grade you want in the class (%)
YOU NEED ON THE FINAL
98.0%
Score at least this on the final to finish with a 90% overall.
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The calculator runs one equation. If w is the final's weight as a decimal (a 20% final means w = 0.2):
needed score = (target − current × (1 − w)) ÷ w
Worked example: you're carrying an 88% and the final counts for 20% of the course, but you want to finish with a 90%. Your pre-final work contributes 88 × 0.8 = 70.4 points toward the course grade, leaving 90 − 70.4 = 19.6 points that the final must supply. Dividing by its weight: 19.6 ÷ 0.2 = 98%. That's the score you need — steep, but doable.
Needed-Score Cheat Sheet
Here's the formula pre-computed for a common target — finishing the course with a 90% — across a range of current grades and final-exam weights:
Score needed on the final to end the course at 90% (>100 = not reachable via the final alone)
Current grade
Final worth 10%
Final worth 20%
Final worth 30%
Final worth 50%
75%
>100
>100
>100
>100
80%
>100
>100
>100
100
85%
>100
>100
>100
95
90%
90
90
90
90
95%
45
70
78.3
85
Two patterns worth noticing. When your current grade already equals the target, the needed score equals the target too, at any weight — a 90% student needs a 90% final, period. And when you're below the target, a heavier final is actually your friend: at 85%, a 50%-weight final makes the 90 reachable (you'd need a 95), while a 10%-weight final can't get you there at all.
When You Need More Than 100%
A required score over 100 means the final alone can't carry you to that target — but it's not always the end of the story. Extra credit can add points the formula doesn't know about, regrade windows on earlier work can raise your current grade, and category-weight quirks (like a dropped lowest quiz) can shift the math in your favor. If none of those apply, aim for the top of the next band down and protect your GPA there.
Points-Based vs. Category-Weighted Courses
This calculator assumes category weighting — the syllabus says "final exam: 20% of your grade," and that percentage holds no matter how many points the exam is printed with. Many classes work this way, but plenty grade on raw points instead: every assignment goes into one pool, and your grade is points earned over points possible.
Points-based classes still fit the formula; you just derive the weight yourself. The final's weight is its point value divided by the course's total points — a 150-point final in a 750-point course is worth 150 ÷ 750 = 20%. Compute your current grade from the points graded so far, then enter both numbers above. Once your final course grades are in, our college GPA calculator turns them into a semester GPA, and the cumulative GPA calculator shows what they do to your overall number.
Frequently Asked Questions
Check the syllabus — the grading breakdown section lists each category's percentage, and the final exam's share is the weight you enter here. If the syllabus is vague or the final sits inside a broader 'exams' category, ask your teacher directly what fraction of the course grade the final alone controls.
Convert the points to a weight: divide the final's point value by the total points possible in the course. A 200-point final in a 1,000-point course is worth 200 ÷ 1,000 = 20%, which you can enter as the weight. Your current grade is your points earned so far divided by points possible so far.
Yes. The math doesn't care whether the last assessment is an exam, a project, a paper, or a presentation — it only needs the assessment's weight in the course grade. Enter the project's percentage weight and your target, and the required score works the same way.
If both are scored together in one category, add their weights and treat them as a single final — the result is the average score you need across both. If they're weighted separately, run the calculator for the first, then rerun it with your updated current grade and the second final's weight once the first score comes back.
Yes — just rearrange the same formula: final course grade = current grade × (1 − weight) + final score × weight. If you're sitting at 84% and expect a 90% on a final worth 25%, you'd finish with 84 × 0.75 + 90 × 0.25 = 85.5%. This calculator solves for the score; that version solves for the outcome.
Crush the final. Then take aim at test day.
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