Test Grade Calculator
Enter the number of questions and how many were missed to get the percentage score, letter grade and points off — the fast way teachers grade a stack of papers.
Grading is really just one division: the number correct divided by the total, turned into a percentage. This calculator does that instantly and maps the result to a letter grade, so you can mark a test in seconds whether you're counting the questions students got wrong or the ones they got right.
How to calculate a test grade
Divide the number of correct answers by the total number of questions, then multiply by 100 for a percentage. If you're counting mistakes instead, subtract them from the total first.
Correct = Total − Number wrong
| Input | Meaning |
|---|---|
| Total questions | How many questions or points the test is out of |
| Number wrong | Questions missed (the classic red-pen count) |
| Correct | Total minus wrong — the score numerator |
Percentage to letter grade
Letter grades vary by school, but this is the most common US plus/minus scale. Enter your score above to see where it lands; the chart below shows the full mapping.
| Letter | Percentage |
|---|---|
| A+ / A / A− | 97–100 / 93–96 / 90–92 |
| B+ / B / B− | 87–89 / 83–86 / 80–82 |
| C+ / C / C− | 77–79 / 73–76 / 70–72 |
| D+ / D / D− | 67–69 / 63–66 / 60–62 |
| F | Below 60 |
Worked example
A 50-question test with 5 wrong:
| Correct = 50 − 5 | 45 |
| Percentage = (45 ÷ 50) × 100 | 90% |
| Letter grade | A− |
Grading tips
For partial credit, count points rather than whole questions — enter the total points possible and the points lost. If different questions are worth different amounts, our weighted tools handle that better; this calculator assumes every question counts equally. When you need to know what a student must score on a remaining test or final to reach a target, use the final grade calculator instead.