Grade calculator for a 18-question test
On a 18-question test, each question is worth 5.56% and you can miss 1 for an A, 3 for a B, 5 for a C and 7 for a D (common 90/80/70/60 scale). One wrong answer is 94.4%.
18-question test grade chart
Score for every number of wrong answers, rounded to one decimal.
| Wrong | Right | Score | Letter |
|---|---|---|---|
| 0 | 18 | 100.0% | A |
| 1 | 17 | 94.4% | A |
| 2 | 16 | 88.9% | B |
| 3 | 15 | 83.3% | B |
| 4 | 14 | 77.8% | C |
| 5 | 13 | 72.2% | C |
| 6 | 12 | 66.7% | D |
| 7 | 11 | 61.1% | D |
| 8 | 10 | 55.6% | F |
| 9 | 9 | 50.0% | F |
| 10 | 8 | 44.4% | F |
| 11 | 7 | 38.9% | F |
| 12 | 6 | 33.3% | F |
| 13 | 5 | 27.8% | F |
| 14 | 4 | 22.2% | F |
| 15 | 3 | 16.7% | F |
| 16 | 2 | 11.1% | F |
| 17 | 1 | 5.6% | F |
| 18 | 0 | 0.0% | F |
The math: score = right answers ÷ 18 × 100. Each question is 100 ÷ 18 = 5.56 percentage points, so every wrong answer takes 5.56 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.