Out of 13 Grade Chart
Every possible score on a 13-question or 13-point test, quiz or assignment, with the percentage and letter grade. Each question is worth 7.69%.
A range (90%+)
12/13
Miss up to 1
B range (80%+)
11/13
Miss up to 2
C range (70%+)
10/13
Miss up to 3
D range (60%+)
8/13
Miss up to 5
| Score | Wrong | Percent | Letter | GPA |
|---|---|---|---|---|
| 13/13 | 0 | 100% | A+ | 4.0 |
| 12/13 | 1 | 92.31% | A- | 3.7 |
| 11/13 | 2 | 84.62% | B | 3.0 |
| 10/13 | 3 | 76.92% | C | 2.0 |
| 9/13 | 4 | 69.23% | D+ | 1.3 |
| 8/13 | 5 | 61.54% | D- | 0.7 |
| 7/13 | 6 | 53.85% | F | 0.0 |
| 6/13 | 7 | 46.15% | F | 0.0 |
| 5/13 | 8 | 38.46% | F | 0.0 |
| 4/13 | 9 | 30.77% | F | 0.0 |
| 3/13 | 10 | 23.08% | F | 0.0 |
| 2/13 | 11 | 15.38% | F | 0.0 |
| 1/13 | 12 | 7.69% | F | 0.0 |
| 0/13 | 13 | 0% | F | 0.0 |
How to calculate a grade out of 13
Percent = score ÷ 13 × 100
For example, 10 out of 13 is 10 ÷ 13 = 0.7692, × 100 = 76.92%, a C. Every question you miss costs 7.69 percentage points, so the gap between letters is often a single question.
Letters follow the standard U.S. plus/minus grading scale. If your teacher uses different cutoffs (like 93/85/77/70), build a custom chart with the EZ Grader. For a single score, the test grade calculator is quickest.
Common questions
What is 11 out of 13 as a percentage?
11/13 is 84.62%, which is a B on the standard U.S. grading scale (3.0 GPA points). That's 2 wrong. One more point (12/13) would make it a B+.
What is 10 out of 13 as a percentage?
10/13 is 76.92%, which is a C on the standard U.S. grading scale (2.0 GPA points). That's 3 wrong. One more point (11/13) would make it a C+.
What is 12 out of 13 as a percentage?
12/13 is 92.31%, which is an A- on the standard U.S. grading scale (3.7 GPA points). That's 1 wrong. One more point (13/13) would make it an A.
How many can you miss out of 13 and still get an A?
You can miss 1 and still get at least 90% (an A-). 12/13 = 92.31%.