📝 Test Score Calculator
Enter how many questions were on the test and how many were wrong, and get the percentage score and letter grade instantly. Teachers can use it to grade quizzes quickly.
Score
How the Test Score Calculator works
Score % = (total questions - wrong answers) / total questions x 100. The percentage is then matched to the standard US letter grade scale with plus and minus grades.
Score % = (Total − Wrong) ÷ Total × 100
Step-by-step calculation
- 1Enter total questions and wrong answers.
- 2Subtract wrong from total.
- 3Divide by total and multiply by 100.
Worked example
40 questions with 6 wrong: 34 ÷ 40 = 85%, a B.
Test Score Calculator examples
| Wrong answers (or points lost) | Score |
|---|---|
| 0 | 100% — A+ |
| 2 | 95% — A |
| 5 | 87.5% — B+ |
| 8 | 80% — B- |
| 12 | 70% — C- |
Other inputs kept at the calculator's default values. Results calculated by this calculator.
Why use a Test Score Calculator?
Grade tests and quizzes in seconds.
Important factors that can affect your results
- Partial credit.
- Questions worth different points.
- Your school's grade scale.
Frequently asked questions
Can I enter points instead of questions?
Yes. Enter total points as the number of questions and points lost as the number wrong; the math is the same.
Is partial credit supported?
Yes, you can enter decimals such as 2.5 wrong.
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Last reviewed November 2026 · How we build and check our tools · Report a problem