How to use the final grade calculator
- Current grade: your grade in the class right now, before the final. Most online gradebooks show it as a percentage.
- Final exam weight: how much of the course grade the final is worth. Your syllabus usually says, for example "Final exam 25%".
- Grade you want: the overall percentage you are aiming for. The quick buttons fill in 90, 80, 70 or 60, the usual cut-offs for an A, B, C or D on a common scale.
The score you need appears as you type. The What if I score... table shows where a final score of 50% to 100% would leave you, which helps when the score you need looks out of reach or when you just want to know how much is riding on the exam.
How the score you need is worked out
When the final is worth a fixed share of the course, your overall grade is a weighted average of two parts: everything you have done so far, and the final.
Overall = current × (1 − w) + final × w
Here w is the final's weight as a decimal, so 25% is 0.25. Turn that around to find the final score that gives the overall grade you want:
Required = (wanted − current × (1 − w)) ÷ w
Say your current grade is 82%, the final is worth 25% and you want 85%. Your coursework counts for the other 75%, so it already gives you 82 × 0.75 = 61.5 points. You need 85 − 61.5 = 23.5 more points from the final, and since the final is worth 25 points in total, that is 23.5 ÷ 0.25 = 94%.
| Score on the final | Overall grade |
|---|---|
| 50% | 74% |
| 60% | 76.5% |
| 70% | 79% |
| 80% | 81.5% |
| 90% | 84% |
| 94% | 85% |
| 100% | 86.5% |
Each 10 points on the final moves the overall grade by 2.5 points, because the final is a quarter of the course. The bigger the weight, the more the final can move your grade in either direction.
When the score is over 100% or below 0%
Over 100%. If you have 72% now, the final is worth 20% and you want 90%, the formula gives (90 − 57.6) ÷ 0.2 = 162%. That is not possible on a normal exam. Even a perfect final would leave you at 57.6 + 20 = 77.6%. The calculator says so, and the what-if table shows the best you can still reach. Extra credit, a curve or a dropped low score could change the picture, so it is worth asking your teacher what is available.
0% or below. If you have 95% now, the final is worth 15% and you want 80%, the formula gives (80 − 80.75) ÷ 0.15 = −5%. A negative score means the grade is already secured: even a zero on the final leaves you at 80.75%. That assumes nothing else changes, so check whether your class has a rule such as needing to sit the final or pass it to pass the course.
Percentages and letter grades
The quick buttons and the letter column use a widely used 10-point scale. The US National Center for Education Statistics uses the same cut-offs when it standardizes high school transcripts for research:
| Percentage | Letter |
|---|---|
| 90 to 100 | A |
| 80 to 89 | B |
| 70 to 79 | C |
| 60 to 69 | D |
| Below 60 | F |
It is a common scale, not a universal one. NCES notes that the credit and grade information on transcripts can "vary considerably among schools, districts and states". Your school may use plus and minus grades or different cut-offs, and courses outside the US often use different grades altogether. If yours differs, type your own target into Grade you want.
Getting the inputs right
- Use the grade without the final. If your gradebook already shows a 0 for the final, your current grade will look far too low. Use the grade from everything else.
- Classes graded by total points. If the course has no percentage weights, the final's weight is its points divided by the course's total points. A 200-point final in a 1,000-point course is worth 20%.
- Work still to come. If there is more coursework before the final, the calculator assumes you keep your current grade on it. To plan across several parts, use the weighted grade calculator.
- Rounding. Results show up to two decimals. Whether 89.5% counts as an A depends on your teacher, so the safe target is the cut-off itself.
Questions and answers
What do I need on my final to get an A?
On the common 10-point scale an A starts at 90%. Tap the A (90%) button, or type 90 into Grade you want, and the calculator shows the score you need. If your school uses a different cut-off for an A, type that instead.
Why does it say I need more than 100%?
Because your current grade and the weight of the final cannot reach that target, even with a perfect exam. The result shows the best overall grade still possible. Extra credit or a curve may help, so ask your teacher.
What does a negative score needed mean?
You have already secured that grade: a zero on the final would still leave you at or above your target. Check whether your class requires you to sit or pass the final anyway.
How much will my final change my grade?
Look at the What if I score table. Each row shows your overall grade for a final score from 50% to 100%. The difference between rows is 10 times the weight, so a final worth 30% moves your grade 3 points for every 10 points on the exam.
My class uses points, not percentages. Does this still work?
Yes. Divide the final exam points by the total points in the course to get its weight. For your current grade, divide the points you have earned by the points possible so far, then multiply by 100.
Is anything I type saved?
No. The calculation runs in your browser and nothing is stored or sent. Refreshing the page clears it.
Sources
Checked on 7 October 2026. If a rule has changed, please tell us.