I Have a 64 in the Class — What Do I Need on the Final?
Going into the final with a 64%: if the final is worth the typical 20%, you need more than a perfect score (an A isn't reachable). Every common weight is below — or set your exact numbers in the calculator.
Runs entirely in your browser — nothing is saved or sent anywhere.
What you need at every final-exam weight
| Final worth | For A | For B | For C | For Pass (D) |
|---|---|---|---|---|
| 10% | Not possible | Not possible | Not possible | 24% |
| 15% | Not possible | Not possible | Not possible | 37.3% |
| 20% | Not possible | Not possible | 94% | 44% |
| 25% | Not possible | Not possible | 88% | 48% |
| 30% | Not possible | Not possible | 84% | 50.7% |
| 40% | Not possible | Not possible | 79% | 54% |
| 50% | Not possible | 96% | 76% | 56% |
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 64% and a heavily weighted final, your ceiling is 82% (50% weight) to 67.6% (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 64% 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
Do professors round up borderline grades?
Entirely at their discretion, and policies vary wildly: some round anything above .5, some round at .45, some never round, and some round only for students who attended office hours or showed improvement. If you're within half a point of a boundary, it is always worth a polite question — before finals week, not after grades post.
Do these calculators store my grades?
No. Everything is computed in your browser the moment you press Calculate — nothing is uploaded, saved or seen by anyone else. Refresh the page and it's gone.