Grade calculator for a 40-question test
On a 40-question test, each question is worth 2.5% and you can miss 4 for an A, 8 for a B, 12 for a C and 16 for a D (common 90/80/70/60 scale). One wrong answer is 97.5%.
40-question test grade chart
Score for every number of wrong answers, rounded to one decimal.
| Wrong | Right | Score | Letter |
|---|---|---|---|
| 0 | 40 | 100.0% | A |
| 1 | 39 | 97.5% | A |
| 2 | 38 | 95.0% | A |
| 3 | 37 | 92.5% | A |
| 4 | 36 | 90.0% | A |
| 5 | 35 | 87.5% | B |
| 6 | 34 | 85.0% | B |
| 7 | 33 | 82.5% | B |
| 8 | 32 | 80.0% | B |
| 9 | 31 | 77.5% | C |
| 10 | 30 | 75.0% | C |
| 11 | 29 | 72.5% | C |
| 12 | 28 | 70.0% | C |
| 13 | 27 | 67.5% | D |
| 14 | 26 | 65.0% | D |
| 15 | 25 | 62.5% | D |
| 16 | 24 | 60.0% | D |
| 17 | 23 | 57.5% | F |
| 18 | 22 | 55.0% | F |
| 19 | 21 | 52.5% | F |
| 20 | 20 | 50.0% | F |
| 21 | 19 | 47.5% | F |
| 22 | 18 | 45.0% | F |
| 23 | 17 | 42.5% | F |
| 24 | 16 | 40.0% | F |
| 25 | 15 | 37.5% | F |
| 26 | 14 | 35.0% | F |
| 27 | 13 | 32.5% | F |
| 28 | 12 | 30.0% | F |
| 29 | 11 | 27.5% | F |
| 30 | 10 | 25.0% | F |
| 31 | 9 | 22.5% | F |
| 32 | 8 | 20.0% | F |
| 33 | 7 | 17.5% | F |
| 34 | 6 | 15.0% | F |
| 35 | 5 | 12.5% | F |
| 36 | 4 | 10.0% | F |
| 37 | 3 | 7.5% | F |
| 38 | 2 | 5.0% | F |
| 39 | 1 | 2.5% | F |
| 40 | 0 | 0.0% | F |
The math: score = right answers ÷ 40 × 100. Each question is 100 ÷ 40 = 2.5 percentage points, so every wrong answer takes 2.5 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.