Given a current grade, the final exam’s weight, and a target course grade, this finds the minimum score needed on the final.
How it works
The weighted-average grade formula is rearranged algebraically to solve for the unknown final-exam score, given the current grade and the target.
What this does not include
This does not include multiple weighted assignment categories beyond the final exam — it assumes a single current-grade figure and one remaining final-exam weight.
How to use this calculator
- Enter your current grade, the final exam’s weight, and your target course grade.
A worked example
Current grade 85%, final exam worth 20% of the total, target overall grade 90%: needed final score = 110% — mathematically impossible, meaning the target can’t be reached even with a perfect exam.
Current grade 80%, final worth 30%, target 85%: needed score = 96.67% — achievable, but demanding.
What the variables mean
| Variable | Meaning |
|---|---|
| Current grade | Grade earned before the final |
| Final weight | What percentage of the overall grade the final counts for |
| Target grade | Desired overall course grade |
Edge cases worth knowing
A needed score over 100% signals the target is unreachable — as the first example shows directly, since no exam score can exceed 100%, that target is already out of reach before the final is even taken.
A final worth 0% of the grade makes the calculation meaningless — no final score could affect an already-fixed overall grade, so the calculator declines to show a result.
Frequently asked questions
What does it mean if the needed score is over 100%?
It means the target grade isn’t reachable through the final exam alone — the current grade combined with the final’s maximum possible weighted contribution falls short.
What if my school uses letter grades instead of percentages?
Convert both the current and target grades to their percentage equivalents first, using your school’s specific grading scale.
Does a heavier final exam weight make the needed score more sensitive to the target?
Yes — the higher the final’s weight, the more the needed score shifts in response to a change in the target grade, since the final carries more influence over the overall outcome.
