How Much Does Your Final Exam Affect Your Overall Grade?

The final exam’s weight is the percentage of the whole course grade assigned to that exam. It determines how much a change in your exam score can move your overall course grade.

Measure the effect of a score change

If the final is worth W of the course, changing the exam score by D percentage points changes the overall grade by:

Overall-grade change = D × W

For a final worth 20% of the course, improving the exam score from 70% to 80% is a 10-point increase. The overall course grade changes by 10 × 0.20 = 2 percentage points, assuming all other scores and weights stay the same.

Calculate the overall grade

When your current grade describes coursework outside the final, combine the two weighted contributions:

Overall grade = current coursework grade × (1 − W) + final score × W

For a current coursework grade of 88%, a final score of 76%, and a final worth 25%:

88 × 0.75 + 76 × 0.25 = 85%

This assumes the “current grade” is the average for non-final coursework, not a portal average that already includes the final or renormalizes completed work.

Compare the final to remaining course work

A final’s stated weight is not always the same as its share of the remaining points. If assignments or projects remain, account for their weights too. The course may also apply a minimum final-exam score, curve, dropped assessment, or other rule that a basic formula cannot infer.

Use the GradeWise overall-grade calculator to try a final score, or use the required-score mode to see what score meets a target. Enter the exam’s actual share of the full course grade and verify the result against your syllabus.