Test Grade Calculator
Enter the number of questions and how many were wrong to get the score, percentage and letter grade, plus a table of grades for every number wrong. Made for teachers marking quickly.
Score
82.5% 33 of 40
- Letter grade
- B−
33 out of 40 is 82.5%, a B− on the common US scale.
How it's worked out
- Score
(40 − 7) ÷ 40 × 10082.5%
Wrong answers and the score
| Wrong | Score | Grade |
|---|---|---|
| 0 | 100% | A+ |
| 1 | 97.5% | A+ |
| 2 | 95% | A |
| 3 | 92.5% | A− |
| 4 | 90% | A− |
| 5 | 87.5% | B+ |
| 6 | 85% | B |
| 7 | 82.5% | B− |
| 8 | 80% | B− |
| 9 | 77.5% | C+ |
| 10 | 75% | C |
| 11 | 72.5% | C− |
| 12 | 70% | C− |
| 13 | 67.5% | D+ |
| 14 | 65% | D |
| 15 | 62.5% | D− |
- Letter grades follow a common US scale; schools and boards set their own. For Pakistani board grades, use the Matric and Inter grade calculator.
The formula
Percentage = (total − wrong) ÷ total × 100
Grade scale used
A+ 97%, A 93%, A− 90%, B+ 87%, B 83%, B− 80%, C+ 77%, C 73%, C− 70%, D+ 67%, D 63%, D− 60%, F below 60%.
Example
A 40-question test with 7 wrong scores 33/40 = 82.5%, a B−.
Questions people ask
How do I work out a test percentage?
Divide the questions right by the total and multiply by 100. 33 right out of 40 is 82.5%.
What letter grade is 82.5%?
On the common US scale it is a B− (80% to 82.9%). Schools and boards set their own cut-offs, so check yours.
Can I enter points instead of questions?
Yes. Enter the total points as the number of questions and the points lost as the number wrong.
About this calculator
Formula and rules last checked 25 October 2026Written and tested by the CalculatorDex teamReport a problem