How to work it out
20 ÷ 40 = 0.5
0.5 × 100 = 50%
Divide the score by the total, then multiply by 100. 20 out of 40 means you got 20 of 40 right and missed 20, so each question is worth 2.5%.
24 out of 40 (60%) would move you up to a D−.
Every score out of 40
| Score | Percent | Letter grade |
|---|---|---|
| 40 out of 40 | 100% | A |
| 39 out of 40 | 97.5% | A |
| 38 out of 40 | 95% | A |
| 37 out of 40 | 92.5% | A− |
| 36 out of 40 | 90% | A− |
| 35 out of 40 | 87.5% | B+ |
| 34 out of 40 | 85% | B |
| 33 out of 40 | 82.5% | B− |
| 32 out of 40 | 80% | B− |
| 31 out of 40 | 77.5% | C+ |
| 30 out of 40 | 75% | C |
| 29 out of 40 | 72.5% | C− |
| 28 out of 40 | 70% | C− |
| 27 out of 40 | 67.5% | D+ |
| 26 out of 40 | 65% | D |
| 25 out of 40 | 62.5% | D− |
| 24 out of 40 | 60% | D− |
| 23 out of 40 | 57.5% | F |
| 22 out of 40 | 55% | F |
| 21 out of 40 | 52.5% | F |
| 20 out of 40 | 50% | F |
| 19 out of 40 | 47.5% | F |
| 18 out of 40 | 45% | F |
| 17 out of 40 | 42.5% | F |
| 16 out of 40 | 40% | F |
| 15 out of 40 | 37.5% | F |
| 14 out of 40 | 35% | F |
| 13 out of 40 | 32.5% | F |
| 12 out of 40 | 30% | F |
| 11 out of 40 | 27.5% | F |
| 10 out of 40 | 25% | F |
| 9 out of 40 | 22.5% | F |
| 8 out of 40 | 20% | F |
| 7 out of 40 | 17.5% | F |
| 6 out of 40 | 15% | F |
| 5 out of 40 | 12.5% | F |
| 4 out of 40 | 10% | F |
| 3 out of 40 | 7.5% | F |
| 2 out of 40 | 5% | F |
| 1 out of 40 | 2.5% | F |
| 0 out of 40 | 0% | F |
Letter grades use the common US scale (93 and up is an A, 90–92 an A−, and so on, below 60 an F). Your school or teacher may use a different one.