Grade calculator for a 13-question test
On a 13-question test, each question is worth 7.69% and you can miss 1 for an A, 2 for a B, 3 for a C and 5 for a D (common 90/80/70/60 scale). One wrong answer is 92.3%.
13-question test grade chart
Score for every number of wrong answers, rounded to one decimal.
| Wrong | Right | Score | Letter |
|---|---|---|---|
| 0 | 13 | 100.0% | A |
| 1 | 12 | 92.3% | A |
| 2 | 11 | 84.6% | B |
| 3 | 10 | 76.9% | C |
| 4 | 9 | 69.2% | D |
| 5 | 8 | 61.5% | D |
| 6 | 7 | 53.8% | F |
| 7 | 6 | 46.2% | F |
| 8 | 5 | 38.5% | F |
| 9 | 4 | 30.8% | F |
| 10 | 3 | 23.1% | F |
| 11 | 2 | 15.4% | F |
| 12 | 1 | 7.7% | F |
| 13 | 0 | 0.0% | F |
The math: score = right answers ÷ 13 × 100. Each question is 100 ÷ 13 = 7.69 percentage points, so every wrong answer takes 7.69 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.