Last updated: October 2026
How do I calculate what I need on my final exam?
Short answer: Enter your current grade, the grade you want, and the final exam's weight into the calculator above. It applies the standard final-grade formula — (desired − current × (1 − weight)) ÷ weight — and instantly shows the score you need.
The formula, with an example
Most courses grade the final as one slice of a weighted average. Say you have 78% going in, the final is worth 30%, and you want a 90%:
(90 − 78 × 0.70) ÷ 0.30 = 118%
That's more than 100% — so a 90 is mathematically out of reach here. The calculator tells you this plainly instead of leaving you guessing, and it shows the highest grade you can still earn (in this example, 84.6% with a perfect final).
What score for each target grade?
Using that same example (78% current, final worth 30%):
What if my course uses weighted categories?
Many syllabi split grades into categories — homework 20%, quizzes 30%, final 50%. To use this calculator, first work out your current weighted average from the categories already graded (multiply each category score by its weight and add them up). Enter that as your current grade, and enter only the final exam's own weight — not the weight of everything combined. For background on how the weighting math works, see grading in education.
Frequently asked questions
How do I calculate what I need on my final exam?
Use the formula (desired grade − current grade × (1 − final weight)) ÷ final weight, with the weight as a decimal. Or just use the calculator above — enter three numbers and it does the math for you.
What if my course uses weighted categories like homework 20% and quizzes 30%?
Compute your current weighted average from the categories already graded and enter that as your current grade. Put only the final exam's own weight in the weight field — not the sum of everything.
What does it mean if the calculator says I need more than 100%?
That target grade is mathematically impossible, even with a perfect final. The calculator shows the highest grade you can still earn — aim for that instead, or ask your instructor about extra credit.
I don't know my exact current grade — can I estimate?
Yes. Enter your best (or slightly conservative) estimate. The result scales linearly, so a 2-point error in your current grade shifts the required final score by roughly 2 points too.
What grade counts as passing?
It varies by school and sometimes by course — commonly 60% (D) to pass and 70% (C) for major or prerequisite courses. Your syllabus has the exact grading scale.
Is my grade data private?
Completely. All calculations run locally in your browser with JavaScript — your grades are never sent to a server, stored, or tracked in any way.
