I Have a 87 in the Class — What Do I Need on the Final?
Going into the final with a 87%: if the final is worth the typical 20%, you need more than a perfect score (an A isn't reachable) and 52% 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 | 17% | Locked in ✓ | Locked in ✓ |
| 15% | Not possible | 40.3% | Locked in ✓ | Locked in ✓ |
| 20% | Not possible | 52% | 2% | Locked in ✓ |
| 25% | 99% | 59% | 19% | Locked in ✓ |
| 30% | 97% | 63.7% | 30.3% | Locked in ✓ |
| 40% | 94.5% | 69.5% | 44.5% | 19.5% |
| 50% | 93% | 73% | 53% | 33% |
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 87% and a heavily weighted final, your ceiling is 93.5% (50% weight) to 88.3% (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 87% 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
Can I still pass if I fail the final?
Often, yes — it depends on your current grade and the final's weight. With an 80 going in and a final worth 20%, even a 40 on the final leaves you at 72. Run your exact numbers in the calculator; 'failing the final means failing the class' is only true when the final is very heavily weighted or your cushion is thin.
How many points is each letter grade worth on a test?
On the standard scale, each letter band spans 10 percentage points, so on a 50-point test a letter grade is about 5 points, and on a 20-point quiz it's about 2. That's why one careless mistake matters more on short assessments — a single 2-point question on a 20-point quiz is an entire letter grade.