Final Grade Calculator
Find out exactly what you need to score on your final exam to lock in the class grade you want — or estimate your final class grade from a specific exam score. Just plug in your current grade and the final's weight.
What Grade Do I Need on the Final?
What Will My Final Class Grade Be?
The Math Behind It
To find the score you need:
Required = (Target − Current × (1 − FinalWeight)) ÷ FinalWeight
Where Target, Current, and the required score are percentages, and FinalWeight is a decimal (e.g. 30% = 0.30).
To predict your final class grade:
Final = Current × (1 − FinalWeight) + FinalScore × FinalWeight
How This Calculator Works
This tool runs two versions of the same weighted-average idea. In "what do I need" mode, it assumes your final exam is worth a fixed share of the course and everything you've already done makes up the rest. It rearranges the grade equation to solve for the one unknown — the final score — using Required = (Target − Current × (1 − FinalWeight)) ÷ FinalWeight, where the weight is expressed as a decimal (30% becomes 0.30). The result tells you the minimum percentage you must earn on the final to land on your target overall grade.
In "what will my grade be" mode it works forward instead, blending your locked-in current grade with a hypothetical final score: Final = Current × (1 − FinalWeight) + FinalScore × FinalWeight. The calculator also flags impossible scenarios — if the required score lands above 100%, your target can't be reached without extra credit, and it says so plainly rather than printing a misleading number.
A Worked Example
Suppose you're sitting at an 85% in the class, the final is worth 30% of your grade, and you want to finish with a 90%. Convert the weight to 0.30. The 85% you already earned only counts for the other 70% of the course, contributing 85 × 0.70 = 59.5 points toward your final percentage. To reach 90 you need the final to supply the remaining 90 − 59.5 = 30.5 points. Since the final is worth 0.30, divide: 30.5 ÷ 0.30 = 101.7%.
That result above 100% means a 90% is just out of reach on this exam alone — you'd land at roughly 89.5% even with a perfect score. Lower the target to an 88% and the required final drops to 91.5%, which is demanding but achievable.
What Affects Your Result
- The final's weight — a heavier final gives a low current grade more room to recover, while a light final locks your grade in place.
- Your current grade accuracy — use the overall weighted percentage from your gradebook, not a raw points total.
- Rounding policy — some instructors round 89.5% up to an A-, which can change whether a target is truly reachable.
- Extra credit — available bonus points can push a required score above 100% into reach.
- Dropped or replaced scores — if your instructor drops your lowest grade, your real current grade may be higher than the gradebook shows.
- Curve adjustments — a curved final shifts the effective score you need below the raw percentage shown here.
Frequently Asked Questions
Where do I find my final exam's weight?
Your syllabus is the authoritative source. Look for a grade-breakdown table that lists categories and percentages, such as "Final Exam: 30%." If the final falls inside a broader exams category, divide that category weight by the number of exams it covers.
What does it mean when the calculator says I need over 100%?
It means your target is mathematically out of reach on the final alone unless extra credit is available. The gap between your current grade and your target is larger than the final's weight can close, so you should either adjust the target or talk to your instructor about extra-credit options.
Is my current grade already weighted?
Yes — the current grade you enter should be the overall percentage your gradebook shows for everything completed so far, with each category already weighted. The final's weight then represents the remaining slice of the course, and the two should add up to 100%.
Can I use this for a cumulative project instead of an exam?
Absolutely. The math treats the final as any single remaining assessment worth a fixed share of your grade. Enter the project's weight in place of the exam weight and the required-score and predicted-grade formulas work identically.