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Final Grade Calculator
Use this final grade calculator to find out exactly what score you need on your final exam to reach the grade you want. Enter your current grade, the grade you are aiming for, and how much of your final grade the exam is worth, and the calculator tells you the minimum final exam score that gets you there — or warns you honestly when the target is out of reach.
Your current grade is everything except the final exam. The final exam weight is the share of your course grade the exam counts for — often 20% to 40%.
How it works
Your course grade is a weighted average of two parts: everything you have done so far, and the final exam. If your final exam is worth 30% of your grade, then your current work is worth the other 70%. The calculator reverses that average to find the final exam score that lands you exactly on your target.
Current grade is your average on all coursework so far, as a percentage, not counting the final exam. You can find it in your gradebook or work it out from your assignment scores. If your class weights homework, quizzes, and tests differently, use the weighted categories mode and the calculator will work out your current grade from those categories for you.
Desired final grade is the course grade you want when everything is counted. Pick a percentage, not just a letter — for example, enter 90 if you want an A, or 80 if a B will do. The grade scale table below shows the usual letter-grade ranges so you can translate a letter into a number.
Final exam weight is the percentage of your course grade that the final exam counts for. Your syllabus usually states it plainly, for example "the final exam is worth 25% of the course grade". Common weights run from 10% for a short final to 40% or even 50% for a big cumulative exam. The heavier the final, the more it can move your grade — for better or worse.
The result is the minimum score you need on the final to hit your target exactly. If the answer comes out above 100%, the calculator says so plainly and shows the highest grade you can still reach with a perfect 100% on the final, so you can pick a realistic new target. If your current grade is already at or above your target, it shows the lowest final score that still keeps you there — sometimes that is 0%, which means your target is already locked in.
Common grade scale
| Letter grade | Percentage range | What it means |
|---|---|---|
| A | 90% – 100% | Excellent |
| B | 80% – 89% | Good |
| C | 70% – 79% | Average |
| D | 60% – 69% | Below average, but passing |
| F | Below 60% | Failing |
These are the most common cutoffs in American schools and colleges, but they are not universal. Some teachers use 93% as the start of an A, some use plus and minus grades like B+ at 87%, and some curve the whole class. If your syllabus lists different cutoffs, use those numbers as your target and ignore the table.
Worked example
Maya has a current grade of 85% in her biology class. She wants to finish with 88%, and her final exam is worth 30% of the course grade. What does she need on the final?
Step 1: Her current work is worth 100% − 30% = 70% of the grade, so it contributes 85 × 0.70 = 59.5 points toward her final grade.
Step 2: She needs 88 points in total, so the final exam must supply 88 − 59.5 = 28.5 points.
Step 3: The final is worth 30% of the grade, so divide: 28.5 ÷ 0.30 = 95. Maya needs 95% on the final exam.
Try it yourself: enter a current grade of 85, a desired grade of 88, and a final weight of 30. The tool gives exactly the same answer — you need 95.00% on the final — and the breakdown table shows the 59.5 points from your current work and the 28.5 points the final must add.
Now change the desired grade to 90 and see what happens. The calculator asks for (90 − 59.5) ÷ 0.30 = 101.67%, which is impossible, so it tells you the target cannot be reached and shows that a perfect 100% on the final would give you 59.5 + 30 = 89.5% at best. That is the honest answer, and it is better to know it before the exam than after.
FAQ
What score do I need on my final to get an A?
It depends on your current grade and how much the final is worth. Enter your current grade, the grade you want, and the final exam weight, and the calculator works out the exact score you need. For example, with a current grade of 85%, a target of 88%, and a final worth 30%, you need 95% on the final exam.
What does it mean if the calculator says the grade is impossible?
It means the score you would need on the final is over 100%, which no exam can give you. For example, if your current grade is 82%, you want a 90%, and the final is only worth 25%, you would need 114% on the final. In that case the calculator tells you the highest grade you can still reach with a perfect final score, so you can set a realistic target instead.
What if I already have the grade I want before the final?
The calculator tells you that too. If your current grade is already at or above your target, it shows the lowest score you can get on the final and still keep that grade — sometimes that is 0%, which means you have already locked in your target. You can also see how much room you have to slip.
How do I find my current grade if my class uses weighted categories?
Switch to the weighted categories mode and enter each category's weight and your average grade in it — for example homework worth 20% at 92%, quizzes worth 30% at 85%, and tests worth 50% at 78%. The calculator combines them into your current grade, then uses it for the final exam calculation. The category weights must add up to 100%.
Does this calculator work for any grading scale?
Yes. The calculator works with percentages, so it fits any class that reports grades as percentages. The grade scale table on the page shows the common American letter-grade ranges — A is 90 to 100%, B is 80 to 89%, C is 70 to 79%, D is 60 to 69%, and F is below 60% — but if your school uses different cutoffs, just enter your target as a percentage and the maths is the same.