Final Grade Calculator
Calculate the score you need on a final exam to reach a target grade in a course. Enter your current grade, the exam's weight, and the grade you want, and the calculator solves for the required exam score.
Required score formula
A course grade with one remaining exam can be written as overall = current x (1 - w) + final x w, where w is the final exam's weight as a decimal. Solving for the exam score gives:
required final score = (target - current x (1 - w)) / w
Here current is your grade on everything completed so far, expressed as a percentage of the non-exam portion of the course. If the result comes out above 100, the target is out of reach without extra credit; if it comes out very low or negative, the target is already secure even with a weak exam performance.
Worked example
A student has a 82% average going into a final exam worth 30% of the course grade, and wants to finish with at least 85%:
required = (85 - 82 x 0.70) / 0.30 = (85 - 57.4) / 0.30 = 27.6 / 0.30 = 92
The student needs a 92% on the final. Trying for a 90% course grade instead gives (90 - 57.4) / 0.30 = 32.6 / 0.30 = 108.7, which is above 100 — so an A of 90% is mathematically out of reach in this course, and the student can set a realistic target instead of an impossible one. To simply hold the current 82%, the required exam score is also 82%, since scoring your current average on the final leaves the overall grade unchanged.
When to use this calculator
- Finals week triage: with three exams in five days, finding out which courses need a high score and which are already safe.
- Deciding whether chasing a higher letter grade is realistic, or whether the cutoff is unreachable and your time is better spent elsewhere.
- Checking how much cushion you have — for example, learning you can score as low as 60% and still pass.
- Planning early in the semester by testing how much a strong final could repair a rough midterm.
Tips for accurate results
- Confirm the final exam's exact weight in the syllabus; 20%, 25%, and 30% produce very different requirements.
- Make sure your current grade covers only completed work, not ungraded assignments counted as zeros.
- If the final replaces a midterm score or the lowest exam when it is higher, this simple formula understates your options — check the syllabus policy.
- Remember that letter-grade cutoffs vary by instructor; verify the percentage that actually earns the grade you want.
- A required score above 100% means the target needs extra credit or a policy exception, not more studying alone.
Related calculators
The attendance calculator tracks another common eligibility requirement for sitting a final. For the underlying math, see the equation solver, the fraction calculator, the proportion calculator, and the combinations calculator.