Grade calculator for a 30-question test
On a 30-question test, each question is worth 3.33% and you can miss 3 for an A, 6 for a B, 9 for a C and 12 for a D (common 90/80/70/60 scale). One wrong answer is 96.7%.
30-question test grade chart
Score for every number of wrong answers, rounded to one decimal.
| Wrong | Right | Score | Letter |
|---|---|---|---|
| 0 | 30 | 100.0% | A |
| 1 | 29 | 96.7% | A |
| 2 | 28 | 93.3% | A |
| 3 | 27 | 90.0% | A |
| 4 | 26 | 86.7% | B |
| 5 | 25 | 83.3% | B |
| 6 | 24 | 80.0% | B |
| 7 | 23 | 76.7% | C |
| 8 | 22 | 73.3% | C |
| 9 | 21 | 70.0% | C |
| 10 | 20 | 66.7% | D |
| 11 | 19 | 63.3% | D |
| 12 | 18 | 60.0% | D |
| 13 | 17 | 56.7% | F |
| 14 | 16 | 53.3% | F |
| 15 | 15 | 50.0% | F |
| 16 | 14 | 46.7% | F |
| 17 | 13 | 43.3% | F |
| 18 | 12 | 40.0% | F |
| 19 | 11 | 36.7% | F |
| 20 | 10 | 33.3% | F |
| 21 | 9 | 30.0% | F |
| 22 | 8 | 26.7% | F |
| 23 | 7 | 23.3% | F |
| 24 | 6 | 20.0% | F |
| 25 | 5 | 16.7% | F |
| 26 | 4 | 13.3% | F |
| 27 | 3 | 10.0% | F |
| 28 | 2 | 6.7% | F |
| 29 | 1 | 3.3% | F |
| 30 | 0 | 0.0% | F |
The math: score = right answers ÷ 30 × 100. Each question is 100 ÷ 30 = 3.33 percentage points, so every wrong answer takes 3.33 points off a perfect 100%. Letters use the common 90/80/70/60 scale with no rounding up; your teacher may use different cutoffs, plus and minus grades or a curve, so check your school’s grading policy.