Grade Calculator - Weighted Grades and Final Exam Score
Calculate your weighted course grade from scores and weights, or find the exact score you need on the final exam.
Enter each assessment with its score and weight to get your weighted course average and letter grade on the standard US scale. Switch to the final exam tab to answer the classic question: given your current grade, your target, and how much the final is worth, what score do you need? The calculator tells you whether the target is achievable, needs a perfect score, or is out of reach.
A course grade is rarely a plain average. A final worth 40% counts twice as much as a midterm worth 20%, so each score has to be multiplied by its weight before averaging. This calculator does that arithmetic for you: add a row per assessment (homework, quizzes, midterm, projects), enter the score and weight as percentages, and the weighted average updates as you type. The matching letter grade appears next to it using the common US cutoffs: A at 93 and above, A- at 90, B+ at 87, and so on down to F below 60.
Weights do not have to add up to 100 for the math to work. If you have only graded 60% of the course so far, the calculator normalizes by the total weight entered, which gives your standing on the work completed to date. A visible warning flags when the total differs from 100 so you know whether you are looking at a partial-semester grade or a typo in a weight field.
The second tab solves the end-of-semester question directly. Given your current grade, the grade you want, and the final exam's weight, it computes the required final score with the formula (target - current x (1 - weight)) / weight. The interpretation is spelled out in plain language: a reachable number, a warning that you need a perfect 100, or the honest answer that the target is impossible along with the best overall grade you can still reach.
- 1
Add your assessments
On the weighted grade tab, add a row for each graded item and enter its score and weight as percentages. The average and letter grade update live.
- 2
Check the weight total
If weights do not sum to 100, a warning appears and the average is computed proportionally over the weights you entered.
- 3
Plan for the final
Switch to the final exam tab, enter your current grade, target grade, and the final's weight, and read off the score you need.
Mid-semester standing
Enter the homework, quiz, and midterm results graded so far to see where you stand before the drop deadline.
Final exam planning
You have an 84% going into a final worth 30% and want an A-. Find out you need a 104%, so a B+ is the realistic target.
Syllabus what-if checks
Model how a 15% project versus a 25% project changes your overall grade before choosing between course sections.
Catching grading errors
Recompute the weighted average your LMS shows. A mismatch often means a score was entered against the wrong category weight.
What letter grade scale does the calculator use?
The standard US scale: A at 93 or above, A- at 90, B+ at 87, B at 83, B- at 80, then the same 3-4 point steps through C and D, with F below 60. If your school uses different cutoffs, read the percentage and map it yourself.
What happens if my weights do not add up to 100?
The calculator still computes a result by dividing by the total weight you entered, so a 90 weighted at 30 out of 60 total counts the same as 30 out of 100 would proportionally. A warning shows so you know the total is off.
How is the required final exam score calculated?
It uses required = (target - current x (1 - w)) / w, where w is the final's weight as a decimal. For example, with an 80% current grade, a 90% target, and a final worth 25%, you need (90 - 80 x 0.75) / 0.25 = 120%, which means the target is not reachable.
Can the calculator handle extra credit scores above 100?
Yes. Score fields accept values above 100, so an assessment graded 105% with extra credit feeds into the weighted average exactly as your instructor would compute it.
Is my grade data stored or sent anywhere?
No. All calculations run in your browser and scores are never uploaded or saved. Closing the tab clears every number you entered; only your choice of tab is remembered locally.