Grading Scale for 30 Questions
Instantly convert test scores to percentages and letter grades for teachers and students
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Complete Grading Chart
| Wrong | Correct | Percentage | Grade | Status |
|---|---|---|---|---|
| 0 | 30 | 100.0% | A | Pass |
| 1 | 29 | 96.67% | A | Pass |
| 2 | 28 | 93.33% | A | Pass |
| 3 | 27 | 90.0% | A | Pass |
| 4 | 26 | 86.67% | B | Pass |
| 5 | 25 | 83.33% | B | Pass |
| 6 | 24 | 80.0% | B | Pass |
| 7 | 23 | 76.67% | C | Pass |
| 8 | 22 | 73.33% | C | Pass |
| 9 | 21 | 70.0% | C | Pass |
| 10 | 20 | 66.67% | D | Pass |
| 11 | 19 | 63.33% | D | Pass |
| 12 | 18 | 60.0% | D | Pass |
| 13 | 17 | 56.67% | F | Fail |
| 14 | 16 | 53.33% | F | Fail |
| 15 | 15 | 50.0% | F | Fail |
| 16 | 14 | 46.67% | F | Fail |
| 17 | 13 | 43.33% | F | Fail |
| 18 | 12 | 40.0% | F | Fail |
| 19 | 11 | 36.67% | F | Fail |
| 20 | 10 | 33.33% | F | Fail |
| 21 | 9 | 30.0% | F | Fail |
| 22 | 8 | 26.67% | F | Fail |
| 23 | 7 | 23.33% | F | Fail |
| 24 | 6 | 20.0% | F | Fail |
| 25 | 5 | 16.67% | F | Fail |
| 26 | 4 | 13.33% | F | Fail |
| 27 | 3 | 10.0% | F | Fail |
| 28 | 2 | 6.67% | F | Fail |
| 29 | 1 | 3.33% | F | Fail |
| 30 | 0 | 0.0% | F | Fail |
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How to Grade a 30-Question Test
Grading a 30-question test is straightforward once you know the formula. Divide the number of correct answers by 30, then multiply by 100 to get the percentage. Then match that percentage to the grading scale.
The Formula
(Correct Answers ÷ 30) × 100 = Percentage
Then use the grading scale: A = 90-100%, B = 80-89%, C = 70-79%, D = 60-69%, F = 0-59%
Worked Example
Isabella’s chapter exam: Isabella got 26 correct out of 30. Their score is (26 ÷ 30) × 100 = 85%. That’s a B (solid performance).
What Each Question Is Worth on a 30-Question Test
On a 30-question test, each question is worth exactly 3.33% of your grade. This means every single question matters.
Understanding per-question value helps you make quick estimates. If you miss one question, subtract 3.33% from 100% to get your score. Missing two questions? Subtract 6.66% from your total.
💡 Pro Tip: 30-question tests are common in AP and college prep courses
To reach a passing grade (60%), you need to get at least 18 questions correct out of 30. Use our test grade calculator to explore what-if scenarios, or check the grading scale calculator for other test lengths. If you need to work backward from a target grade, try our grade calculator.
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