Final Grade Calculator
Enter your current grade, how much the final is worth, and the grade you want. You get the exact score you need.
The formula
Needed = (target − current × (1 − w)) ÷ w, where w = final weight ÷ 100
It reads as: everything already graded is locked in at current × (1 − w), so the final has to supply the rest.
What a realistic target looks like
Current grade 88%, final worth 20% of the course:
| Target grade | Already locked in | Needed on final | Verdict |
|---|---|---|---|
| 80% | 70.4 | 48.0 | Comfortable |
| 85% | 70.4 | 73.0 | Realistic |
| 88% | 70.4 | 88.0 | Match your average |
| 90% | 70.4 | 98.0 | Near-perfect paper |
| 92% | 70.4 | 108.0 | Impossible without extra credit |
The pattern to internalise: when the final is worth only 20%, each point of target costs five points on the exam. When it is worth 40%, each point of target costs 2.5 — which is why a heavy final is both a threat and the last real lever you have.
When the answer is above 100%
That is not a bug, it is the honest answer. Three things can still change it, in order of how often they actually apply:
- Extra credit or a grade replacement policy. Some syllabi let the final replace the lowest exam score, which changes the formula rather than the target.
- A curve. If the class average lands low, the instructor may curve the final itself, so the percentage you need in raw points is lower than the number here.
- Rounding at the boundary. An 89.5 is often recorded as an A− or even an A. It is worth asking before you accept the letter grade.
Common questions
Do I enter my current grade as a percentage or a letter?
A percentage — the running course grade, not the letter. If your gradebook shows points instead, divide points earned by points possible.
What if my final is worth 50% or more?
The formula handles it, but the practical consequence is severe: at 50% weight, every point of final grade is worth half a point of course grade, so a 70 on the final against an 88 average lands at 79. Courses with a 50% final are effectively decided on the last day.
Can I use this to plan a target before the term starts?
Yes, with current grade set to 100 to see the cost of each target, or to your expected grade on the graded portion. The grade calculator is the better tool once several items have scores.