Trying to figure out what score you need on your final exam? You can estimate it with a simple formula. The key is knowing your current grade, how much the final exam is worth, and the overall grade you want to earn.
This guide explains the calculation with clear examples, including weighted grades and the score you need to reach a target. You can also use the Grade Calculator to check your coursework or exam calculations.
The formula for your required final exam score
If your current grade represents all work completed before the final, and the final exam is a percentage of your total course grade, use this formula:
Required final exam score = (Target course grade − Current grade × (1 − Final exam weight)) ÷ Final exam weight
Write the grades and exam weight as decimals when using the formula. For example, 85% becomes 0.85 and a final worth 30% becomes 0.30. Multiply the required score by 100 to express it as a percentage.
Example 1: What do you need to earn an A?
Imagine your current course grade is 88%, your final exam is worth 25% of the course grade, and you want to finish with 90%.
- Current grade: 88%
- Target course grade: 90%
- Final exam weight: 25%
Calculation: (90 − 88 × 0.75) ÷ 0.25 = (90 − 66) ÷ 0.25 = 96.
You need to score 96% on the final exam to reach a 90% overall grade, assuming the grading weights and current grade are accurate.
Example 2: What if you want to pass the class?
Suppose your current grade is 62%, the final is worth 40%, and you need 60% overall to pass.
Calculation: (60 − 62 × 0.60) ÷ 0.40 = (60 − 37.2) ÷ 0.40 = 57.
You would need at least 57% on the final to finish with 60% overall. Check your syllabus to confirm the passing grade and whether any minimum exam score is required.
How to calculate a required score step by step
- Find your current grade. Use the grade for completed coursework, not a score that already includes the final exam.
- Check the final exam weight. Your syllabus or learning platform should show what percentage of the course grade the exam counts for.
- Choose your target. Decide the overall course grade you want, such as 70%, 80%, or 90%.
- Enter the numbers in the formula. Keep percentages and weights consistent.
- Check whether the result is possible. If the required score is above 100%, that target cannot be reached through the final alone under those assumptions.
Quick reference table
| Current grade | Final exam weight | Target overall grade | Required exam score |
|---|---|---|---|
| 80% | 20% | 85% | 105% (not possible) |
| 85% | 30% | 80% | 68.3% |
| 75% | 40% | 70% | 62.5% |
| 62% | 40% | 60% | 57% |
These examples assume the current grade applies to the non-final portion of the course and that the final exam is the only remaining graded item. Your course may use points, categories, or special rules instead.
What if the final exam is worth points instead of a percentage?
If your instructor uses total points, calculate the points needed rather than a weighted exam percentage. Find the total course points possible, the points you have earned so far, and the total points needed for your target grade. Subtract your earned points from the target points to find how many points you still need. Then divide by the points available on the final and multiply by 100.
For example, if you need 720 total points to reach your target and have earned 610 points, you need 110 more points. If the final is worth 150 points, that means you need 110 ÷ 150 × 100 = 73.3%.
Common mistakes to avoid
- Using the final exam weight as a whole number instead of a decimal.
- Using a current grade that already includes a placeholder or predicted final score.
- Assuming every class uses the same letter-grade cutoffs.
- Forgetting that extra credit, dropped assignments, or minimum-exam rules can change the result.
- Rounding too early. Keep a few decimal places during the calculation and round the final answer at the end.
Frequently asked questions
Can I still get an A if I have a low current grade?
It depends on your current grade and the final exam weight. Use the formula to calculate the exact score required. If it is above 100%, you would need additional points, extra credit, or another grading opportunity to reach that target.
What score do I need on a final worth 20%?
There is no single answer because it depends on your current grade and your target overall grade. Substitute 0.20 for the final exam weight in the formula, along with your own grades.
What if the required score is over 100%?
Under the assumptions used, the target cannot be reached through the final exam alone. Check your syllabus for extra credit, dropped scores, or other remaining assignments that may affect your final grade.
Where can I check my calculation?
Review your course syllabus first, then use the Grade Calculator to help check your grade math. For more practical tools and guides, visit the NumNest.
Plan your final exam target
Knowing your required score can help you set a realistic study goal. Confirm the grading rules, calculate the target carefully, and focus your preparation on the topics that matter most. A required score is an estimate based on the numbers you enter, so always check it against your instructor’s grading policy.