The final exam grade formula
Convert the final exam weight to a decimal before using the formula. For example, a final worth 30% of the course grade has a weight of 0.30.
Score needed = [target grade − current grade × (1 − final weight)] ÷ final weight
A worked example
Suppose your current course grade is 82%, you want to finish with an 85%, and the final exam is worth 30%.
- Multiply the current grade by the completed course weight: 82 × 0.70 = 57.4.
- Subtract that result from the target grade: 85 − 57.4 = 27.6.
- Divide by the exam weight: 27.6 ÷ 0.30 = 92.
You need 92% on the final exam to finish the course with an 85%.
Want the answer instantly?Use the free grade calculator →How to interpret the result
Below 0%
You have already secured the target grade, even if you earn no additional points on the final.
Between 0% and 100%
The target is mathematically possible. Use the result as your minimum exam goal.
Above 100%
The target is not possible from the final alone. Ask whether extra credit, dropped work, or another grading rule applies.
Exactly 100%
You must earn every available final-exam point to reach the target.
Check these details before you calculate
- Use the current weighted grade. A simple average may be wrong when assignments, quizzes, and exams have different weights.
- Confirm whether the final replaces another grade. If it does, the standard formula will not reflect that rule.
- Keep percentages consistent. Enter 82 for 82%, not 0.82, when using a percentage-based calculator.
- Allow for rounding. Your learning platform and instructor may round grades differently.
Frequently asked questions
Combine the parts only if they share one final-exam weight. If each part has a separate course weight, calculate them as separate graded items.
Yes, but a points method is simpler: subtract your earned points from the points required for your target, then compare the remainder with the points available on the final.