Grade calculator for a 39-question test
On a 39-question test, each question is worth 2.56% and you can miss 3 for an A, 7 for a B, 11 for a C and 15 for a D (common 90/80/70/60 scale). One wrong answer is 97.4%.
39-question test grade chart
Score for every number of wrong answers, rounded to one decimal.
| Wrong | Right | Score | Letter |
|---|---|---|---|
| 0 | 39 | 100.0% | A |
| 1 | 38 | 97.4% | A |
| 2 | 37 | 94.9% | A |
| 3 | 36 | 92.3% | A |
| 4 | 35 | 89.7% | B |
| 5 | 34 | 87.2% | B |
| 6 | 33 | 84.6% | B |
| 7 | 32 | 82.1% | B |
| 8 | 31 | 79.5% | C |
| 9 | 30 | 76.9% | C |
| 10 | 29 | 74.4% | C |
| 11 | 28 | 71.8% | C |
| 12 | 27 | 69.2% | D |
| 13 | 26 | 66.7% | D |
| 14 | 25 | 64.1% | D |
| 15 | 24 | 61.5% | D |
| 16 | 23 | 59.0% | F |
| 17 | 22 | 56.4% | F |
| 18 | 21 | 53.8% | F |
| 19 | 20 | 51.3% | F |
| 20 | 19 | 48.7% | F |
| 21 | 18 | 46.2% | F |
| 22 | 17 | 43.6% | F |
| 23 | 16 | 41.0% | F |
| 24 | 15 | 38.5% | F |
| 25 | 14 | 35.9% | F |
| 26 | 13 | 33.3% | F |
| 27 | 12 | 30.8% | F |
| 28 | 11 | 28.2% | F |
| 29 | 10 | 25.6% | F |
| 30 | 9 | 23.1% | F |
| 31 | 8 | 20.5% | F |
| 32 | 7 | 17.9% | F |
| 33 | 6 | 15.4% | F |
| 34 | 5 | 12.8% | F |
| 35 | 4 | 10.3% | F |
| 36 | 3 | 7.7% | F |
| 37 | 2 | 5.1% | F |
| 38 | 1 | 2.6% | F |
| 39 | 0 | 0.0% | F |
The math: score = right answers ÷ 39 × 100. Each question is 100 ÷ 39 = 2.56 percentage points, so every wrong answer takes 2.56 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.