What Grade Is 30 out of 40? (30/40)
30 out of 40 (30/40) is 75%: a C on all three common scales. That is 10 wrong answers and 2.0 GPA points on the 4.0 scale.
- Percentage
- 75%
- 30 / 40 x 100
- 10 point letter
- C
- C with +/-, C on 7 point
- Wrong
- 10
- of 40 questions
- 4.0 GPA
- 2.0
- for a C
One more right, one fewer: 31/40 and 29/40
One more right makes it 31 out of 40, a 77.5%: still a C on the 10 point scale and a C+ with pluses and minuses. One fewer is 29 out of 40, a 72.5%, the same C (C- with pluses and minuses). Each question is worth 2.5 percentage points.
The next letter up with pluses and minuses is a C+ at 31/40 (77.5%), 1 more right answer away. On the 10 point scale the next step is a B at 32/40, 2 questions away.
Right answers needed for each letter out of 40
| Letter | Percent | Right | From 30/40 |
|---|---|---|---|
| A | 93 to 100 | 38 or more | 8 more right |
| A- | 90 to under 93 | 36 or more | 6 more right |
| B+ | 87 to under 90 | 35 or more | 5 more right |
| B | 83 to under 87 | 34 or more | 4 more right |
| B- | 80 to under 83 | 32 or more | 2 more right |
| C+ | 77 to under 80 | 31 or more | 1 more right |
| C | 73 to under 77 | 30 or more | your score |
| C- | 70 to under 73 | 28 or more | 1 fewer |
| D+ | 67 to under 70 | 27 or more | 3 fewer |
| D | 63 to under 67 | 26 or more | 4 fewer |
| D- | 60 to under 63 | 24 or more | 5 fewer |
| F | below 60 | 23 or fewer | 7 fewer |
Plus and minus scale; the 10 point letter is the plain letter. Every letter can happen with whole scores out of 40.
75% on other test lengths
30/40 is exactly the same grade as 9 out of 12, 15 out of 20 and 45 out of 60: 75%, a C.
Is 30 out of 40 passing?
Yes. Where passing starts at 60%, which is 24 right out of 40, 30/40 clears it by 6 questions. It also passes where the line is 70% (28 right), as on the 7 point scale. Whether a D passes the class is a separate rule, covered in the passing grade guide.
Out of 40 grade chart with 30/40 marked
| Score | Percent | 10 pt | +/- | 7 pt |
|---|---|---|---|---|
| 40/40 | 100% | A | A | A |
| 39/40 | 97.5% | A | A | A |
| 38/40 | 95% | A | A | A |
| 37/40 | 92.5% | A | A- | B |
| 36/40 | 90% | A | A- | B |
| 35/40 | 87.5% | B | B+ | B |
| 34/40 | 85% | B | B | B |
| 33/40 | 82.5% | B | B- | C |
| 32/40 | 80% | B | B- | C |
| 31/40 | 77.5% | C | C+ | C |
| 30/40 | 75% | C | C | C |
| 29/40 | 72.5% | C | C- | D |
| 28/40 | 70% | C | C- | D |
| 27/40 | 67.5% | D | D+ | F |
| 26/40 | 65% | D | D | F |
| 25/40 | 62.5% | D | D- | F |
| 24/40 | 60% | D | D- | F |
| 23/40 | 57.5% | F | F | F |
| 22/40 | 55% | F | F | F |
| 21/40 | 52.5% | F | F | F |
| 20/40 | 50% | F | F | F |
| 19/40 | 47.5% | F | F | F |
| 18/40 | 45% | F | F | F |
| 17/40 | 42.5% | F | F | F |
| 16/40 | 40% | F | F | F |
| 15/40 | 37.5% | F | F | F |
| 14/40 | 35% | F | F | F |
| 13/40 | 32.5% | F | F | F |
| 12/40 | 30% | F | F | F |
| 11/40 | 27.5% | F | F | F |
| 10/40 | 25% | F | F | F |
| 9/40 | 22.5% | F | F | F |
| 8/40 | 20% | F | F | F |
| 7/40 | 17.5% | F | F | F |
| 6/40 | 15% | F | F | F |
| 5/40 | 12.5% | F | F | F |
| 4/40 | 10% | F | F | F |
| 3/40 | 7.5% | F | F | F |
| 2/40 | 5% | F | F | F |
| 1/40 | 2.5% | F | F | F |
| 0/40 | 0% | F | F | F |
Whole scores; the printable out of 40 chart adds a lookup and a CSV download.
How to calculate 30 out of 40 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.
30/40 as a percent: worked example
You get 30 right on a 40 question test. What is the percent and the letter?
- 30 / 40 = 0.75 (3/4 in lowest terms)
- 0.75 x 100 = 75%
- 75 is a C on all three scales (73 to under 77 with pluses and minuses)
30/40 is 75%: a C on all three common scales.
Questions and answers
Is a 30 out of 40 a good grade?
75% is an average score on the 10 point scale (a C). An A takes 36 right, 6 more right answers than 30. It passes on every common scale.
What do I need for the next letter after 30/40?
31 right out of 40 (77.5%) is a C+ with pluses and minuses, 1 more question than 30. For a B on the 10 point scale you need 32 right.
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