Grade Calculator
Find out exactly what you need on the final exam to reach your target grade — or calculate your current weighted grade from your categories.
What do I need on the final?
Current weighted grade
The formulas
Weighted grade = Σ(score × weight) ÷ Σ weight
Current 85%, final worth 30%, target 90%: (90 − 85×0.70) ÷ 0.30 = 101.7% — not reachable without extra credit. Lower the target to 88% and you'd need 95%.
Four quiz scores: 60, 85, 90, 88. Averaged together: (60 + 85 + 90 + 88) ÷ 4 = 323 ÷ 4 = 80.75%.
If the syllabus drops the lowest score, the 60 is removed entirely — not counted as a zero — and only three scores remain: (85 + 90 + 88) ÷ 3 = 263 ÷ 3 = 87.67%. That's nearly 7 points higher, so always check whether a "drop the lowest" policy applies before assuming your current average is final.
Using it to plan finals week
This calculator turns anxiety into a number. Enter your passing threshold as the target to see the minimum you need (sometimes reassuringly low), or your dream grade to see how realistic it is. If the required score exceeds 100%, the target isn't reachable through the final alone — time to ask about extra credit or reset expectations. The weighting also shows where effort pays off: points in a heavily weighted final or exam move your grade far more than the same points in light homework. For your cumulative GPA across courses, use the GPA calculator.
Grading policies that change the math
- Dropped lowest score. As shown above, removing the lowest score (rather than zeroing it) can meaningfully raise a category average — recalculate manually if your syllabus mentions this policy.
- Curved grading. Some instructors add points to every score, or grade on a class-wide distribution, after the raw weighted average is calculated — this tool computes the raw average only.
- Extra credit. Bonus points typically add directly to a category's score without changing its weight, which can push a category average above 100% for that category alone.
Common grade-calculation mistakes
- Zeroing out a dropped score instead of removing it. A dropped lowest score should be excluded from both the sum and the count/weight, not averaged in as a 0.
- Using the current-grade formula when you actually want your final class grade. The "needed on the final" formula assumes the final hasn't happened yet — once it has, just use the weighted-grade calculator with the final's actual score included.
- Forgetting that weights don't need to sum to exactly 100. The weighted-average formula normalizes automatically by dividing by the total weight entered, so a typo that leaves weights summing to 95 or 105 doesn't necessarily break the math, though it's still worth double-checking against the syllabus.
Frequently asked questions
What grade do I need on the final?
(Target − current × (1 − final weight)) ÷ final weight. Over 100% means it's not reachable via the final alone.
How do weighted grades work?
Each category counts for a set % of the total; grade = Σ(score × weight) ÷ Σ weight.
Can I still pass if I fail the final?
Enter your passing threshold as the target to see the minimum final score needed.
How does a dropped lowest score change a weighted grade?
The dropped score is removed entirely, not zeroed. Quizzes 60, 85, 90, 88 average 80.75%, but 87.67% with the 60 dropped.
What if my category weights don't add up to 100%?
The formula still works — dividing by the total weight entered normalizes the result — but double-check against your syllabus for typos.
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Note: Assumes a simple weighted grading scheme; check your syllabus for drops, curves, or extra credit. Last reviewed: September 2026.