How to Calculate What You Need on Your Final Exam

Knowing the score you need on a final is a weighted-average problem. You need three values: your current grade before the final, your target overall course grade, and the final exam’s share of the course grade.

The required-final formula

Let C be your current coursework grade as a percentage, T your desired overall course grade, and W the final exam weight as a decimal. The coursework completed so far contributes C × (1 − W) to the final course grade. The exam must provide the rest:

Required final score = (T − C × (1 − W)) ÷ W

For example, if your current grade is 84%, the target is 88%, and the final is worth 30%, use W = 0.30:

(88 − 84 × 0.70) ÷ 0.30 = 97.33%

You would need about 97.34% to reach at least 88%, depending on your course’s rounding policy.

Check whether the target is possible

A result above 100% means the target cannot be reached with a final capped at 100%, given those inputs. The highest possible course grade is:

Maximum course grade = C × (1 − W) + 100 × W

If the required score is 0% or less, your current coursework contribution already meets the target under this model. A zero-weight final cannot change the grade, so compare your current grade directly with the target instead of dividing by zero.

Enter the course weight correctly

Use the final’s percentage of the whole course grade, not its share of the remaining coursework. If the syllabus says the final is 25% of the course, enter 25%. The coursework portion is then 75%.

The calculation assumes your current grade represents the average across all non-final coursework and that the final is the only remaining work. If other assignments remain, account for them using your syllabus or a weighted category planner.

Try your own numbers

Use the GradeWise final grade calculator to calculate a required final score, or switch to Overall after final to see a course grade for a score you already know. Always check the result against your instructor’s rounding and grading rules.