Out of 21 Grade Chart
Every possible score on a 21-question or 21-point test, quiz or assignment, with the percentage and letter grade. Each question is worth 4.76%.
A range (90%+)
19/21
Miss up to 2
B range (80%+)
17/21
Miss up to 4
C range (70%+)
15/21
Miss up to 6
D range (60%+)
13/21
Miss up to 8
| Score | Wrong | Percent | Letter | GPA |
|---|---|---|---|---|
| 21/21 | 0 | 100% | A+ | 4.0 |
| 20/21 | 1 | 95.24% | A | 4.0 |
| 19/21 | 2 | 90.48% | A- | 3.7 |
| 18/21 | 3 | 85.71% | B | 3.0 |
| 17/21 | 4 | 80.95% | B- | 2.7 |
| 16/21 | 5 | 76.19% | C | 2.0 |
| 15/21 | 6 | 71.43% | C- | 1.7 |
| 14/21 | 7 | 66.67% | D | 1.0 |
| 13/21 | 8 | 61.9% | D- | 0.7 |
| 12/21 | 9 | 57.14% | F | 0.0 |
| 11/21 | 10 | 52.38% | F | 0.0 |
| 10/21 | 11 | 47.62% | F | 0.0 |
| 9/21 | 12 | 42.86% | F | 0.0 |
| 8/21 | 13 | 38.1% | F | 0.0 |
| 7/21 | 14 | 33.33% | F | 0.0 |
| 6/21 | 15 | 28.57% | F | 0.0 |
| 5/21 | 16 | 23.81% | F | 0.0 |
| 4/21 | 17 | 19.05% | F | 0.0 |
| 3/21 | 18 | 14.29% | F | 0.0 |
| 2/21 | 19 | 9.52% | F | 0.0 |
| 1/21 | 20 | 4.76% | F | 0.0 |
| 0/21 | 21 | 0% | F | 0.0 |
How to calculate a grade out of 21
Percent = score ÷ 21 × 100
For example, 17 out of 21 is 17 ÷ 21 = 0.8095, × 100 = 80.95%, a B-. Every question you miss costs 4.76 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 18 out of 21 as a percentage?
18/21 is 85.71%, which is a B on the standard U.S. grading scale (3.0 GPA points). That's 3 wrong. One more point (19/21) would make it a B+.
What is 17 out of 21 as a percentage?
17/21 is 80.95%, which is a B- on the standard U.S. grading scale (2.7 GPA points). That's 4 wrong. One more point (18/21) would make it a B.
What is 16 out of 21 as a percentage?
16/21 is 76.19%, which is a C on the standard U.S. grading scale (2.0 GPA points). That's 5 wrong. One more point (17/21) would make it a C+.
What is 20 out of 21 as a percentage?
20/21 is 95.24%, which is an A on the standard U.S. grading scale (4.0 GPA points). That's 1 wrong. One more point (21/21) would make it an A+.
What is 19 out of 21 as a percentage?
19/21 is 90.48%, which is an A- on the standard U.S. grading scale (3.7 GPA points). That's 2 wrong. One more point (20/21) would make it an A.
How many can you miss out of 21 and still get an A?
You can miss 2 and still get at least 90% (an A-). 19/21 = 90.48%.