What Grade Is 21 out of 30? (21/30)
21 out of 30 (21/30) is 70%: a C on the 10 point scale, a C- with pluses and minuses and a D on the 7 point scale. That is 9 wrong answers and 1.7 GPA points on the 4.0 scale.
- Percentage
- 70%
- 21 / 30 x 100
- 10 point letter
- C
- C- with +/-, D on 7 point
- Wrong
- 9
- of 30 questions
- 4.0 GPA
- 1.7
- for a C-
One more right, one fewer: 22/30 and 20/30
One more right makes it 22 out of 30, a 73.33%: still a C on the 10 point scale. One fewer is 20 out of 30, a 66.67%, a D. Each question is worth 3.33 percentage points.
The next letter up with pluses and minuses is a C at 22/30 (73.33%), 1 more right answer away. On the 10 point scale the next step is a B at 24/30, 3 questions away.
Right answers needed for each letter out of 30
| Letter | Percent | Right | From 21/30 |
|---|---|---|---|
| A | 93 to 100 | 28 or more | 7 more right |
| A- | 90 to under 93 | 27 or more | 6 more right |
| B | 83 to under 87 | 25 or more | 4 more right |
| B- | 80 to under 83 | 24 or more | 3 more right |
| C | 73 to under 77 | 22 or more | 1 more right |
| C- | 70 to under 73 | 21 or more | your score |
| D | 63 to under 67 | 19 or more | 1 fewer |
| D- | 60 to under 63 | 18 or more | 3 fewer |
| F | below 60 | 17 or fewer | 4 fewer |
Plus and minus scale; the 10 point letter is the plain letter. B+, C+ and D+ cannot happen with whole scores out of 30.
70% on other test lengths
21/30 is exactly the same grade as 7 out of 10, 14 out of 20, 28 out of 40, 35 out of 50 and 42 out of 60: 70%, a C.
Is 21 out of 30 passing?
Yes. Where passing starts at 60%, which is 18 right out of 30, 21/30 clears it by 3 questions. It also passes where the line is 70% (21 right), as on the 7 point scale, with nothing to spare. Whether a D passes the class is a separate rule, covered in the passing grade guide.
Out of 30 grade chart with 21/30 marked
| Score | Percent | 10 pt | +/- | 7 pt |
|---|---|---|---|---|
| 30/30 | 100% | A | A | A |
| 29/30 | 96.67% | A | A | A |
| 28/30 | 93.33% | A | A | A |
| 27/30 | 90% | A | A- | B |
| 26/30 | 86.67% | B | B | B |
| 25/30 | 83.33% | B | B | C |
| 24/30 | 80% | B | B- | C |
| 23/30 | 76.67% | C | C | C |
| 22/30 | 73.33% | C | C | D |
| 21/30 | 70% | C | C- | D |
| 20/30 | 66.67% | D | D | F |
| 19/30 | 63.33% | D | D | F |
| 18/30 | 60% | D | D- | F |
| 17/30 | 56.67% | F | F | F |
| 16/30 | 53.33% | F | F | F |
| 15/30 | 50% | F | F | F |
| 14/30 | 46.67% | F | F | F |
| 13/30 | 43.33% | F | F | F |
| 12/30 | 40% | F | F | F |
| 11/30 | 36.67% | F | F | F |
| 10/30 | 33.33% | F | F | F |
| 9/30 | 30% | F | F | F |
| 8/30 | 26.67% | F | F | F |
| 7/30 | 23.33% | F | F | F |
| 6/30 | 20% | F | F | F |
| 5/30 | 16.67% | F | F | F |
| 4/30 | 13.33% | F | F | F |
| 3/30 | 10% | F | F | F |
| 2/30 | 6.67% | F | F | F |
| 1/30 | 3.33% | F | F | F |
| 0/30 | 0% | F | F | F |
Whole scores; the printable out of 30 chart adds a lookup and a CSV download.
How to calculate 21 out of 30 as a percentage
Divide the number right by the number of questions, multiply by 100, then find the band on your school's scale. CurveFox reads the letter from the exact percent, the same rule as the grading scale chart.
Next step: put this test into your class grade with the grade calculator, see what the final needs with the final grade calculator, or curve a whole class with the grade curve calculator.
21/30 as a percent: worked example
You get 21 right on a 30 question test. What is the percent and the letter?
- 21 / 30 = 0.7 (7/10 in lowest terms)
- 0.7 x 100 = 70%
- 70 is in 70 to under 80 on the 10 point scale (C), 70 to under 73 with pluses and minuses (C-) and 70 to under 75 on the 7 point scale (D)
21/30 is 70%: a C on the 10 point scale, a C- with pluses and minuses and a D on the 7 point scale.
Questions and answers
Is a 21 out of 30 a good grade?
70% is an average score on the 10 point scale (a C). An A takes 27 right, 6 more right answers than 21. It passes on every common scale.
What do I need for the next letter after 21/30?
22 right out of 30 (73.33%) is a C with pluses and minuses, 1 more question than 21. For a B on the 10 point scale you need 24 right.
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