Out of 18 Grade Chart
Every possible score on a 18-question or 18-point test, quiz or assignment, with the percentage and letter grade. Each question is worth 5.56%.
A range (90%+)
17/18
Miss up to 1
B range (80%+)
15/18
Miss up to 3
C range (70%+)
13/18
Miss up to 5
D range (60%+)
11/18
Miss up to 7
| Score | Wrong | Percent | Letter | GPA |
|---|---|---|---|---|
| 18/18 | 0 | 100% | A+ | 4.0 |
| 17/18 | 1 | 94.44% | A | 4.0 |
| 16/18 | 2 | 88.89% | B+ | 3.3 |
| 15/18 | 3 | 83.33% | B | 3.0 |
| 14/18 | 4 | 77.78% | C+ | 2.3 |
| 13/18 | 5 | 72.22% | C- | 1.7 |
| 12/18 | 6 | 66.67% | D | 1.0 |
| 11/18 | 7 | 61.11% | D- | 0.7 |
| 10/18 | 8 | 55.56% | F | 0.0 |
| 9/18 | 9 | 50% | F | 0.0 |
| 8/18 | 10 | 44.44% | F | 0.0 |
| 7/18 | 11 | 38.89% | F | 0.0 |
| 6/18 | 12 | 33.33% | F | 0.0 |
| 5/18 | 13 | 27.78% | F | 0.0 |
| 4/18 | 14 | 22.22% | F | 0.0 |
| 3/18 | 15 | 16.67% | F | 0.0 |
| 2/18 | 16 | 11.11% | F | 0.0 |
| 1/18 | 17 | 5.56% | F | 0.0 |
| 0/18 | 18 | 0% | F | 0.0 |
How to calculate a grade out of 18
Percent = score ÷ 18 × 100
For example, 14 out of 18 is 14 ÷ 18 = 0.7778, × 100 = 77.78%, a C+. Every question you miss costs 5.56 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 15 out of 18 as a percentage?
15/18 is 83.33%, which is a B on the standard U.S. grading scale (3.0 GPA points). That's 3 wrong. One more point (16/18) would make it a B+.
What is 14 out of 18 as a percentage?
14/18 is 77.78%, which is a C+ on the standard U.S. grading scale (2.3 GPA points). That's 4 wrong. One more point (15/18) would make it a B-.
What is 17 out of 18 as a percentage?
17/18 is 94.44%, which is an A on the standard U.S. grading scale (4.0 GPA points). That's 1 wrong. One more point (18/18) would make it an A+.
What is 16 out of 18 as a percentage?
16/18 is 88.89%, which is a B+ on the standard U.S. grading scale (3.3 GPA points). That's 2 wrong. One more point (17/18) would make it an A-.
How many can you miss out of 18 and still get an A?
You can miss 1 and still get at least 90% (an A-). 17/18 = 94.44%.