Grade calculator for a 28-question test
On a 28-question test, each question is worth 3.57% and you can miss 2 for an A, 5 for a B, 8 for a C and 11 for a D (common 90/80/70/60 scale). One wrong answer is 96.4%.
28-question test grade chart
Score for every number of wrong answers, rounded to one decimal.
| Wrong | Right | Score | Letter |
|---|---|---|---|
| 0 | 28 | 100.0% | A |
| 1 | 27 | 96.4% | A |
| 2 | 26 | 92.9% | A |
| 3 | 25 | 89.3% | B |
| 4 | 24 | 85.7% | B |
| 5 | 23 | 82.1% | B |
| 6 | 22 | 78.6% | C |
| 7 | 21 | 75.0% | C |
| 8 | 20 | 71.4% | C |
| 9 | 19 | 67.9% | D |
| 10 | 18 | 64.3% | D |
| 11 | 17 | 60.7% | D |
| 12 | 16 | 57.1% | F |
| 13 | 15 | 53.6% | F |
| 14 | 14 | 50.0% | F |
| 15 | 13 | 46.4% | F |
| 16 | 12 | 42.9% | F |
| 17 | 11 | 39.3% | F |
| 18 | 10 | 35.7% | F |
| 19 | 9 | 32.1% | F |
| 20 | 8 | 28.6% | F |
| 21 | 7 | 25.0% | F |
| 22 | 6 | 21.4% | F |
| 23 | 5 | 17.9% | F |
| 24 | 4 | 14.3% | F |
| 25 | 3 | 10.7% | F |
| 26 | 2 | 7.1% | F |
| 27 | 1 | 3.6% | F |
| 28 | 0 | 0.0% | F |
The math: score = right answers ÷ 28 × 100. Each question is 100 ÷ 28 = 3.57 percentage points, so every wrong answer takes 3.57 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.