Calculate the exact score you need on the final exam to hit a target letter grade for the class. Shows breakpoints for A, A-, B, C, and D side by side so you can plan your study effort.
Solves the weighted-average equation: (target - current_grade * (1 - final_weight)) / final_weight = needed score. Returns "impossible" if the result exceeds 100 and "already locked in" if you would pass even with a zero on the final. Verdict label (comfortable / tight / risky / extreme / impossible) summarizes how realistic each target is.
Disclaimer: Assumes the final is the last remaining assignment graded out of 100. Some schools use +/- thresholds that differ from the defaults shown - check your syllabus for exact cutoffs.
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Calculator information
📋 How to use this calculator
- Enter your percentage average for the completed coursework. Use the average before the final exam, not a gradebook total that already treats the final as a zero.
- Read the final exam weight from your syllabus and enter it as a percentage. A final worth 25% leaves 75% for the completed work.
- Enter the percentage you want for the course overall. Letter-grade cutoffs vary by instructor, so use your own syllabus rather than the comparison labels as a grading policy.
- Read the required final-exam score. A result above 100% cannot be reached under this model without extra credit or a changed grading policy.
- Try another target or exam weight to compare scenarios. The calculation assumes all remaining work is represented by the final exam.
🧮 Solve a weighted course grade for the final exam score
F = (T - C × (1 - w)) / w
- C is the completed-coursework average, expressed as a percentage.
- T is the target course percentage.
- w is the final exam weight as a decimal, such as 0.25 for 25%.
- F is the final exam percentage required to meet the target.
The underlying equation is T = C × (1 - w) + F × w. It applies to a weighted percentage system, not a points-based gradebook with different remaining assignments. The final weight must be greater than zero and no more than 100%.
💡 Worked example: An 88% coursework average, a 25% final, and a 90% target
Given:- Completed coursework: 88%
- Final exam weight: 25%
- Target course grade: 90%
Steps:- Convert the exam weight to a decimal: 25 / 100 = 0.25.
- Calculate the contribution from completed work: 88 × 0.75 = 66 percentage points.
- Find the contribution still needed: 90 - 66 = 24 percentage points.
- Divide by the exam weight: 24 / 0.25 = 96%.
- Check the answer: 88 × 0.75 + 96 × 0.25 = 90%.
Result: A 96% final-exam score produces a 90% course grade. With a 100% exam score, the highest course grade in this scenario is 91%.
❓ Frequently asked questions
Why does my required score exceed 100%?
The completed work and the remaining exam weight do not leave enough room to reach your chosen target with a score of 100%. Lower the target to explore attainable outcomes. The calculator cannot account for discretionary extra credit or a curve.
What does a zero or negative required score mean?
The completed coursework already contributes enough percentage points to meet the target even with a zero on the final. You may still have to take or pass the exam under course rules; this is a mathematical result, not permission to skip it.
Can I use the total shown in my online gradebook?
Only if that total is the weighted average of completed coursework before the final. Some gradebooks include missing work as zeros or use total earned points instead of category weights. Check how the displayed total was calculated.
Does 90% always mean an A?
No. The comparison table uses illustrative cutoffs. Your syllabus can use different letter grades, rounding rules, minimum exam scores, or a curve. Enter the percentage threshold that applies to your class.
📚 Sources & references
Last updated: October 3, 2026