How weighted grades work
Each assessment counts in proportion to its weight: a 90% on homework worth 20% of the course contributes 18 points to your overall grade. The calculator multiplies every grade by its weight, adds them up and divides by the total weight entered — so it stays correct even before all weights are in, showing your average over the work graded so far.
The final-exam formula
If the final is worth F percent of the course, the rest of your work is worth (100 − F). The score you need is (target − current × (1 − F/100)) ÷ (F/100). Intuition: the heavier the final, the more it can rescue — or sink — the grade. A 30% final can move your overall mark by at most 30 points.
Reading the verdict honestly
A needed score above 100% means the target is mathematically gone on this exam alone — time to ask about extra credit or adjust the goal. A negative number means the opposite: the target is already locked in and the final cannot take it away. Between 85% and 100% is technically possible but plan for it seriously.
Frequently asked questions
My weights don't add up to 100 — is that a problem?
No. The calculator averages over the weights you have entered, which is exactly your standing on the graded portion. The final-exam section then treats the final as its own weight against everything else.
How do letter grades map to percentages?
The common US scale: A is 93+, A− 90–92, B+ 87–89, B 83–86, B− 80–82, C+ 77–79, C 73–76, and so on. Your institution's scale wins — check the syllabus.
Is my data stored or sent anywhere?
No. Your marks stay in the page and are not stored.
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