Grade calculator for a 21-question test
On a 21-question test, each question is worth 4.76% and you can miss 2 for an A, 4 for a B, 6 for a C and 8 for a D (common 90/80/70/60 scale). One wrong answer is 95.2%.
21-question test grade chart
Score for every number of wrong answers, rounded to one decimal.
| Wrong | Right | Score | Letter |
|---|---|---|---|
| 0 | 21 | 100.0% | A |
| 1 | 20 | 95.2% | A |
| 2 | 19 | 90.5% | A |
| 3 | 18 | 85.7% | B |
| 4 | 17 | 81.0% | B |
| 5 | 16 | 76.2% | C |
| 6 | 15 | 71.4% | C |
| 7 | 14 | 66.7% | D |
| 8 | 13 | 61.9% | D |
| 9 | 12 | 57.1% | F |
| 10 | 11 | 52.4% | F |
| 11 | 10 | 47.6% | F |
| 12 | 9 | 42.9% | F |
| 13 | 8 | 38.1% | F |
| 14 | 7 | 33.3% | F |
| 15 | 6 | 28.6% | F |
| 16 | 5 | 23.8% | F |
| 17 | 4 | 19.0% | F |
| 18 | 3 | 14.3% | F |
| 19 | 2 | 9.5% | F |
| 20 | 1 | 4.8% | F |
| 21 | 0 | 0.0% | F |
The math: score = right answers ÷ 21 × 100. Each question is 100 ÷ 21 = 4.76 percentage points, so every wrong answer takes 4.76 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.