I Have a 78 in the Class — What Do I Need on the Final?
Going into the final with a 78%: if the final is worth the typical 20%, you need more than a perfect score (an A isn't reachable) and 88% for a B. Every common weight is below — or set your exact numbers in the calculator.
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What you need at every final-exam weight
| Final worth | For A | For B | For C | For Pass (D) |
|---|---|---|---|---|
| 10% | Not possible | 98% | Locked in ✓ | Locked in ✓ |
| 15% | Not possible | 91.3% | 24.7% | Locked in ✓ |
| 20% | Not possible | 88% | 38% | Locked in ✓ |
| 25% | Not possible | 86% | 46% | 6% |
| 30% | Not possible | 84.7% | 51.3% | 18% |
| 40% | Not possible | 83% | 58% | 33% |
| 50% | Not possible | 82% | 62% | 42% |
Reading this table
"Locked in" means even a zero on the final keeps that grade. "Not possible" means a perfect final still wouldn't get you there — with a 78% and a heavily weighted final, your ceiling is 89% (50% weight) to 80.2% (10% weight). The math: needed = (target − current × (1 − weight)) ÷ weight.
Worth knowing
Confirm the scale in your syllabus
The 90/80/70/60 letter cutoffs used here are the most common US scale, but plenty of courses curve, use plus/minus bands differently, or set an A at 94. The syllabus — not any calculator — is the contract that counts.
The registrar's number wins
Online gradebooks lag, professors enter marks late, and rounding policies differ by course. Any calculator — including this one — is a planning tool; the transcript is the record.
The A is gone — spend the time where it still moves
At 78% with a 20%-weighted final an A is out of reach, and that is genuinely useful information: it means these hours are worth more spent on a course where the letter can still move. Rank your courses by how much a grade can shift per hour before you open a book — the finals-week triage guide is a method for doing exactly that.
We keep free study resources for 13 subjects — what specifically loses students marks in that course, free courses and open textbooks worth the time, and separate plans for whether you have a week or one night. Algebra, Precalculus, Calculus, Statistics, General Chemistry, or all 13 subjects.
Common questions
Is a 3.5 GPA good?
On the standard 4.0 scale, 3.5 sits between an A- and B+ average — comfortably above the typical US college average (around 3.1) and competitive for most graduate programs, internships and scholarships, though the most selective programs skew 3.7+. Trend matters too: an upward trajectory reads better than a flat one.
What GPA do I need for the Dean's List?
Most schools set Dean's List between 3.5 and 3.7 for the semester, with a minimum credit load (often 12+ graded credits). It's a semester GPA, not cumulative — one strong term can make the list even in a rebuilding year. Your school's exact cutoff will be published by the registrar.