Grading Scale for 30 Questions
Percent and letter grade for every score on a 30-question test.
On a 30-question test, each question is worth about 3.33 points. This chart uses a standard plus/minus scale (A- at 90%, B- at 80%, C- at 70% and D- at 60%), so "an A" here means A- or better. Students need 27 right for an A, 24 for a B, 21 for a C and 18 for a D. They can miss 3 questions and still get an A, or 6 and still get a B.
- A27+ rightA- or better
- B24+ rightB- or better
- C21+ rightC- or better
- D18+ rightD- or better
At a glance
- Every exact grade on the scale, from A down to F with each plus and minus, has a score that earns it.
- Of the 31 possible scores, 4 scores earn an A, 3 a B, 3 a C, 3 a D and 18 an F.
- The lowest score that isn't an F is 18 right (60%), a D-.
- Percentages are rounded to the nearest whole number, so 29 out of 30 shows as 97%.
Examples
- 29 out of 30 is 97% (A)
- 26 out of 30 is 87% (B+)
- 22 out of 30 is 73% (C)
Customize this scale
Change the cutoffs, or add half points or bonus questions, in the free calculator.
Grade Table
| Right | Percentage | Grade |
|---|---|---|
| 30 | 100% | A |
| 29 | 97% | A |
| 28 | 93% | A- |
| 27 | 90% | A- |
| 26 | 87% | B+ |
| 25 | 83% | B |
| 24 | 80% | B- |
| 23 | 77% | C+ |
| 22 | 73% | C |
| 21 | 70% | C- |
| 20 | 67% | D+ |
| 19 | 63% | D |
| 18 | 60% | D- |
| 17 | 57% | F |
| 16 | 53% | F |
| 15 | 50% | F |
| 14 | 47% | F |
| 13 | 43% | F |
| 12 | 40% | F |
| 11 | 37% | F |
| 10 | 33% | F |
| 9 | 30% | F |
| 8 | 27% | F |
| 7 | 23% | F |
| 6 | 20% | F |
| 5 | 17% | F |
| 4 | 13% | F |
| 3 | 10% | F |
| 2 | 7% | F |
| 1 | 3% | F |
| 0 | 0% | F |