About this calculator
"What do I need on the final?" is the most-asked question of every school year, and it is pure weighted-average math: your current grade covers part of the course, the final covers the rest, and the target has to come out of the blend. This calculator answers it exactly — including the uncomfortable cases, where the honest answer is "more than 100%" (start negotiating or recalibrate the target) or "nothing at all" (already secured).
The score mode uses the standard US percentage scale (A from 90%, B from 80%, and so on). Be aware that real syllabi vary: some use 93% for an A, some curve, some weight categories so that raw points do not map directly onto percentages. When a syllabus defines its own scale, its numbers rule.
How to use it
- Score mode: enter points earned and points possible to get the percentage and letter grade.
- Final mode: enter your current percentage, your target percentage, and how much of the course grade the final is worth (from the syllabus).
- Read the needed score — and the assessment line, which tells you honestly how realistic it is.
The formula
For the final: your course grade is the weighted blend current × (1 − weight) + final × weight. Setting that equal to the target and solving for the final gives the formula. If the result is above 100, the target is mathematically out of reach; below 0, it is already guaranteed.
Worked example
Scoring 42 out of 50 is 84% — a B. For the final: with an 88% current grade, a target of 90%, and a final worth 25%, you need (90 − 88 × 0.75) ÷ 0.25 = 96% on the final. Tighten the numbers and it turns stark: from 82% with a 30%-weighted final, a 90% target needs 108.7% — impossible, which is exactly the kind of thing worth knowing in week 10 rather than finals week.
Sources: Weighted-average arithmetic across assignment categories. Last updated: October 2026.
Frequently asked questions
What percentage is an A, B, C, D or F?
On the most common US scale: A = 90%–100%, B = 80%–89%, C = 70%–79%, D = 60%–69%, F = below 60%. Plus/minus refinements typically put A− at 90–92, B+ at 87–89, and so on. Some institutions use 93% for an A or grade on a curve — always defer to your syllabus.
The calculator says I need more than 100%. What can I do?
Options, in order of realism: lower the target to what a strong final can reach (re-run with a target 1–2 points lower to see the cliff); ask the instructor about extra credit or dropped-lowest-score policies before the final, not after; and protect the other courses — an unwinnable grade fight should not drag down winnable ones. What does not work: hoping for a curve generous enough to cover a 10-point mathematical gap.
How do I find my current grade and the final's weight?
Both live in the syllabus and your LMS (Canvas, Blackboard, etc.): current grade is usually shown as a running percentage, and the syllabus's grading breakdown states the final's weight. If categories are weighted (homework 20%, tests 50%…), the LMS percentage already reflects that — use it as "current grade" and the final category's weight as the weight.
Does this work for GPA goals too?
Conceptually yes — a cumulative GPA is a credit-weighted average, so a "needed GPA" question works the same way with credits as weights. Our GPA Calculator computes the weighted average itself; the multi-semester planning math is covered in its FAQ.
What formula does this grade calculator use?
Score % = earned ÷ total × 100; Needed on final = (Target − Current × (1 − weight)) ÷ weight For the final: your course grade is the weighted blend current × (1 − weight) + final × weight. Setting that equal to the target and solving for the final gives the formula. If the result is above 100, the target is mathematically out of reach; below 0, it is already guaranteed. The worked example on this page applies the formula step by step with real numbers, so you can verify the result by hand.