21 out of 30 as a Grade: Chart for a 30-Question Test
Quick answer: 21 out of 30 is 70%, a C-. 28 out of 30 is 93.33%, an A.
Each question on a 30-question test is worth 3.33%. You can miss up to 3 and keep an A- (90%).
Standard plus/minus scale. Last reviewed: October 2026.
Popular scores on a 30-question test
The scores people look up most, on the plus/minus scale and on a plain 10-point scale (A starts at 90%).
ezgradercalc.com · 30-question grading chart · standard plus/minus scale
EZ Grader Chart: Every Score on a 30-Question Test
Find the number correct in the first column and read the percentage and letter grade in the same row. Use this easy grader chart for a whole stack of papers with the same number of questions.
| Score | Wrong | Percentage | Letter |
|---|---|---|---|
| 30 out of 30 | 0 | 100% | A+ |
| 29 out of 30 | 1 | 96.67% | A |
| 28 out of 30 | 2 | 93.33% | A |
| 27 out of 30 | 3 | 90% | A- |
| 26 out of 30 | 4 | 86.67% | B |
| 25 out of 30 | 5 | 83.33% | B |
| 24 out of 30 | 6 | 80% | B- |
| 23 out of 30 | 7 | 76.67% | C |
| 22 out of 30 | 8 | 73.33% | C |
| 21 out of 30 | 9 | 70% | C- |
| 20 out of 30 | 10 | 66.67% | D |
| 19 out of 30 | 11 | 63.33% | D |
| 18 out of 30 | 12 | 60% | D- |
| 17 out of 30 | 13 | 56.67% | F |
| 16 out of 30 | 14 | 53.33% | F |
| 15 out of 30 | 15 | 50% | F |
| 14 out of 30 | 16 | 46.67% | F |
| 13 out of 30 | 17 | 43.33% | F |
| 12 out of 30 | 18 | 40% | F |
| 11 out of 30 | 19 | 36.67% | F |
| 10 out of 30 | 20 | 33.33% | F |
| 9 out of 30 | 21 | 30% | F |
| 8 out of 30 | 22 | 26.67% | F |
| 7 out of 30 | 23 | 23.33% | F |
| 6 out of 30 | 24 | 20% | F |
| 5 out of 30 | 25 | 16.67% | F |
| 4 out of 30 | 26 | 13.33% | F |
| 3 out of 30 | 27 | 10% | F |
| 2 out of 30 | 28 | 6.67% | F |
| 1 out of 30 | 29 | 3.33% | F |
| 0 out of 30 | 30 | 0% | F |
Show the half-point chart for 30 questions
| Score | Wrong | Percentage | Letter |
|---|---|---|---|
| 30 out of 30 | 0 | 100% | A+ |
| 29.5 out of 30 | 0.5 | 98.33% | A+ |
| 29 out of 30 | 1 | 96.67% | A |
| 28.5 out of 30 | 1.5 | 95% | A |
| 28 out of 30 | 2 | 93.33% | A |
| 27.5 out of 30 | 2.5 | 91.67% | A- |
| 27 out of 30 | 3 | 90% | A- |
| 26.5 out of 30 | 3.5 | 88.33% | B+ |
| 26 out of 30 | 4 | 86.67% | B |
| 25.5 out of 30 | 4.5 | 85% | B |
| 25 out of 30 | 5 | 83.33% | B |
| 24.5 out of 30 | 5.5 | 81.67% | B- |
| 24 out of 30 | 6 | 80% | B- |
| 23.5 out of 30 | 6.5 | 78.33% | C+ |
| 23 out of 30 | 7 | 76.67% | C |
| 22.5 out of 30 | 7.5 | 75% | C |
| 22 out of 30 | 8 | 73.33% | C |
| 21.5 out of 30 | 8.5 | 71.67% | C- |
| 21 out of 30 | 9 | 70% | C- |
| 20.5 out of 30 | 9.5 | 68.33% | D+ |
| 20 out of 30 | 10 | 66.67% | D |
| 19.5 out of 30 | 10.5 | 65% | D |
| 19 out of 30 | 11 | 63.33% | D |
| 18.5 out of 30 | 11.5 | 61.67% | D- |
| 18 out of 30 | 12 | 60% | D- |
| 17.5 out of 30 | 12.5 | 58.33% | F |
| 17 out of 30 | 13 | 56.67% | F |
| 16.5 out of 30 | 13.5 | 55% | F |
| 16 out of 30 | 14 | 53.33% | F |
| 15.5 out of 30 | 14.5 | 51.67% | F |
| 15 out of 30 | 15 | 50% | F |
| 14.5 out of 30 | 15.5 | 48.33% | F |
| 14 out of 30 | 16 | 46.67% | F |
| 13.5 out of 30 | 16.5 | 45% | F |
| 13 out of 30 | 17 | 43.33% | F |
| 12.5 out of 30 | 17.5 | 41.67% | F |
| 12 out of 30 | 18 | 40% | F |
| 11.5 out of 30 | 18.5 | 38.33% | F |
| 11 out of 30 | 19 | 36.67% | F |
| 10.5 out of 30 | 19.5 | 35% | F |
| 10 out of 30 | 20 | 33.33% | F |
| 9.5 out of 30 | 20.5 | 31.67% | F |
| 9 out of 30 | 21 | 30% | F |
| 8.5 out of 30 | 21.5 | 28.33% | F |
| 8 out of 30 | 22 | 26.67% | F |
| 7.5 out of 30 | 22.5 | 25% | F |
| 7 out of 30 | 23 | 23.33% | F |
| 6.5 out of 30 | 23.5 | 21.67% | F |
| 6 out of 30 | 24 | 20% | F |
| 5.5 out of 30 | 24.5 | 18.33% | F |
| 5 out of 30 | 25 | 16.67% | F |
| 4.5 out of 30 | 25.5 | 15% | F |
| 4 out of 30 | 26 | 13.33% | F |
| 3.5 out of 30 | 26.5 | 11.67% | F |
| 3 out of 30 | 27 | 10% | F |
| 2.5 out of 30 | 27.5 | 8.33% | F |
| 2 out of 30 | 28 | 6.67% | F |
| 1.5 out of 30 | 28.5 | 5% | F |
| 1 out of 30 | 29 | 3.33% | F |
| 0.5 out of 30 | 29.5 | 1.67% | F |
| 0 out of 30 | 30 | 0% | F |
How many can you miss on a 30-question test?
The most wrong answers allowed for each grade. Each question is worth 3.33%.
| Grade | Minimum score | Correct needed | Most wrong allowed |
|---|---|---|---|
| A+ | 97% | 30 | 0 |
| A | 93% | 28 | 2 |
| A- | 90% | 27 | 3 |
| B+ | 87% | 27 | 3 |
| B | 83% | 25 | 5 |
| B- | 80% | 24 | 6 |
| C+ | 77% | 24 | 6 |
| C | 73% | 22 | 8 |
| C- | 70% | 21 | 9 |
| D+ | 67% | 21 | 9 |
| D | 63% | 19 | 11 |
| D- | 60% | 18 | 12 |
Your school may use different cutoffs. See the grading scale chart for the plus/minus, 10-point and 7-point scales.
Frequently asked questions about a 30-question test
What grade is 21 out of 30?
21 out of 30 is 70%, a C- on the standard plus/minus scale. 21/30 means 21 correct and 9 wrong. A school that uses a 10-point scale without plus or minus would call it a C.
What is 28/30 as a grade?
28 out of 30 is 93.33%, an A, with 2 wrong, on the standard plus/minus scale.
What is 20/30 as a grade?
20 out of 30 is 66.67%, a D, with 10 wrong, on the standard plus/minus scale.
What is 24/30 as a grade?
24 out of 30 is 80%, a B-, with 6 wrong, on the standard plus/minus scale.
How many questions can I miss on a 30-question test and still get an A?
You can miss up to 3 and still earn an A- (90%), or up to 2 for an A (93%). For a B (83%) the limit is up to 5, for a C (73%) it is up to 8, and to stay at a passing D- (60%) it is up to 12.
How much is each question worth on a 30-question test?
Each question is worth 3.33% of the grade, so every wrong answer lowers the score by 3.33 percentage points.
What score passes on a 30-question test?
At a 60% pass mark you need 18 correct, which is 60%, a D- on the plus/minus scale. One fewer (17 out of 30) is 56.67%, an F. Some schools set a higher pass mark such as 70%, which needs 21 correct.
Can I give half points on a 30-question test?
Yes. Open the half-point chart on this page, or use the calculator and switch it to half points. For example, 21.5 out of 30 is 71.67%, a C-.
How do I print the 30-question chart?
Press Print / save as PDF above the chart. Only this chart is printed, and you can choose Save as PDF in the print window to get a file instead of paper.
What grading scale does this chart use?
The standard U.S. plus/minus scale: A at 93%, A- at 90%, B+ at 87%, B at 83%, B- at 80%, C+ at 77%, C at 73%, C- at 70%, D+ at 67%, D at 63% and D- at 60%. Schools set their own cutoffs, so if yours differ, read the percentage column and apply your own.
Other test sizes
- 8 questions
- 10 questions
- 12 questions
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- 15 questions
- 16 questions
- 18 questions
- 20 questions
- 22 questions
- 24 questions
- 25 questions
- 30 questions
- 34 questions
- 40 questions
- 45 questions
- 50 questions
- 60 questions
- 100 questions
Different length? The easy grader calculator works for any number of questions, and the chart hub lists every size.