Test score charts
Look up any score as a percentage and letter grade, and see how many questions you can miss for each grade on tests of every common size.
Popular score lookups
Grading scale by test size
| Test size | A (90%) | B (80%) | C (70%) | D (60%) |
|---|---|---|---|---|
| 5 questions | 5 | 4 | 4 | 3 |
| 8 questions | 8 | 7 | 6 | 5 |
| 10 questions | 9 | 8 | 7 | 6 |
| 11 questions | 10 | 9 | 8 | 7 |
| 12 questions | 11 | 10 | 9 | 8 |
| 13 questions | 12 | 11 | 10 | 8 |
| 14 questions | 13 | 12 | 10 | 9 |
| 15 questions | 14 | 12 | 11 | 9 |
| 16 questions | 15 | 13 | 12 | 10 |
| 17 questions | 16 | 14 | 12 | 11 |
| 18 questions | 17 | 15 | 13 | 11 |
| 20 questions | 18 | 16 | 14 | 12 |
| 21 questions | 19 | 17 | 15 | 13 |
| 22 questions | 20 | 18 | 16 | 14 |
| 24 questions | 22 | 20 | 17 | 15 |
| 25 questions | 23 | 20 | 18 | 15 |
| 26 questions | 24 | 21 | 19 | 16 |
| 28 questions | 26 | 23 | 20 | 17 |
| 30 questions | 27 | 24 | 21 | 18 |
| 32 questions | 29 | 26 | 23 | 20 |
| 35 questions | 32 | 28 | 25 | 21 |
| 36 questions | 33 | 29 | 26 | 22 |
| 40 questions | 36 | 32 | 28 | 24 |
| 45 questions | 41 | 36 | 32 | 27 |
| 48 questions | 44 | 39 | 34 | 29 |
| 50 questions | 45 | 40 | 35 | 30 |
| 55 questions | 50 | 44 | 39 | 33 |
| 60 questions | 54 | 48 | 42 | 36 |
| 65 questions | 59 | 52 | 46 | 39 |
| 70 questions | 63 | 56 | 49 | 42 |
| 75 questions | 68 | 60 | 53 | 45 |
| 80 questions | 72 | 64 | 56 | 48 |
| 90 questions | 81 | 72 | 63 | 54 |
| 100 questions | 90 | 80 | 70 | 60 |
Each cell is the minimum number correct for that grade.
Every score, by test size
Out of 100
Frequently Asked Questions
Divide the points you earned by the points possible, then multiply by 100. For example, 18 out of 20 is (18 ÷ 20) × 100 = 90%.
An A normally starts at 90%, so you can miss up to 10% of the questions. On a 20-question test that is 2, on a 50-question test it is 5, and on a 100-question test it is 10. Each test-size chart below lists the exact number for every letter grade.
Grading scales vary. The default here is the standard US plus/minus scale, but plenty of schools use a plain 10-point scale or a stricter 7-point scale. Every score page shows all three so you can match the one on your syllabus.
These charts assume every question is worth one point. If your test has weighted sections, use the grade calculator and enter each section with its own points possible.