Enter your current grade, the final exam weight, and your target grade to find out exactly what score you need on the final.
Required Final Score = (Target Grade − Current Grade × (1 − Final Weight)) ÷ Final Weight
Example: current grade 78%, final worth 30%, target 80%. Required score = (80 − 78 × 0.70) ÷ 0.30 = (80 − 54.6) ÷ 0.30 = 84.7%.
| Current Grade | Target | Final Worth 25% | Final Worth 30% | Final Worth 40% |
|---|---|---|---|---|
| 75% | 80% (B−) | 95% | 91.7% | 87.5% |
| 78% | 80% (B−) | 86% | 84.7% | 83% |
| 82% | 83% (B) | 86% | 85.3% | 84.5% |
| 58% | 60% (pass) | 65.5% | 63% | 61.7% |
| 87% | 90% (A−) | 99% | 97% | 94.5% |
If your required score exceeds 100%, your current grade is too low to hit your target — no matter how perfectly you do on the final. Your maximum possible course grade with a perfect final is: Current Grade × (1 − Final Weight) + 100 × Final Weight. For example, a current grade of 70% with a 30% final gives a maximum of 70 × 0.70 + 100 × 0.30 = 79%. You can get to 79% but not 80%.
Your options when the target is unreachable:
A negative required score means you have already locked in your target grade — even scoring zero on the final keeps you above your goal. This happens when your current grade is so strong that the final cannot pull it below your target. The exam is low stakes. Attend, do your best, and move on.
| Final Weight | Max grade swing (0% vs 100% on final) | Common in |
|---|---|---|
| 20% | 20 percentage points | Lab sciences, writing-heavy courses |
| 30% | 30 percentage points | Most humanities and social science courses |
| 40% | 40 percentage points | Math, economics, many STEM courses |
| 50% | 50 percentage points | Some law, business, and graduate courses |
A final worth 20% means even a perfect final can only move your course grade 20 points up (and zero to 100% performance only differs by 20 percentage points of course grade). A final worth 40% or more is a major lever — strong performance can rescue a semester, and weak performance can ruin one.
Every percentage point on your final exam moves your course letter grade, which moves your GPA. The difference between finishing at 79% (C+, 2.3 GPA points) and 80% (B−, 2.7 GPA points) is one percentage point on the exam — but it is 0.4 GPA points on your transcript in a 3-credit course. The difference between a B− (2.7) and a B (3.0) is another 0.3 GPA points. These margins accumulate across your courses and affect your semester and cumulative GPA meaningfully.
If you are close to a threshold that matters — scholarship GPA minimum, graduate school application, academic standing — use the GPA Calculator to model exactly how different course grades will land on your semester GPA before finals.
If you need 85% or higher, generic studying is not efficient enough. Use these approaches:
What if I don't know the exact weight of my final exam? Check your course syllabus — the grading breakdown is almost always listed there. If it's not, email your professor directly; getting this number right matters more than any other input in this calculator.
Does this work for cumulative vs non-cumulative finals? Yes — the weight-based math is the same regardless of what the final covers. Whether the exam tests the whole semester or just the last unit, it's still worth the percentage your syllabus specifies.
Can I use this for a final project instead of an exam? Yes, as long as you know its weight in your final grade. The formula works for any single graded component worth a fixed percentage of your course grade.
What if my class has multiple finals or a final that's split into parts? Combine the weights into a single total and treat it as one input, or run the calculator once per component if each part has a separately known score requirement.
Grade Calculator — track all assignments and see your current weighted course grade.
GPA Calculator — see how this course grade affects your cumulative GPA.
GPA Raise Calculator — how many A's do you need to hit your GPA goal?
How to Calculate Your Final Exam Grade — the full guide with step-by-step examples.