Grading chart · 21 questions

21 Question Grading Scale: Out of 21 Grading Chart

15 out of 21 is 71.43%, which is a C- on the standard grading scale. Below is every score from 21/21 down to 0/21 with its percentage, letter grade and number wrong.

Out of 21 grade calculator

15/21 is

71.43%
C- Passing
Wrong answers
6
Each question
4.76%
Needed to pass
13/21

Out of 21 grading chart

Every possible score on a 21-question test. Each question is worth 4.76%.

Grading chart for a 21-question test: every score with its percentage and letter grade
Score Wrong Percentage Grade Status
21/21 0 100% A+ Passing
20/21 1 95.24% A Passing
19/21 2 90.48% A- Passing
18/21 3 85.71% B Passing
17/21 4 80.95% B- Passing
16/21 5 76.19% C Passing
15/21 6 71.43% C- Passing
14/21 7 66.67% D Passing
13/21 8 61.9% D Passing
12/21 9 57.14% F Not passing
11/21 10 52.38% F Not passing
10/21 11 47.62% F Not passing
9/21 12 42.86% F Not passing
8/21 13 38.1% F Not passing
7/21 14 33.33% F Not passing
6/21 15 28.57% F Not passing
5/21 16 23.81% F Not passing
4/21 17 19.05% F Not passing
3/21 18 14.29% F Not passing
2/21 19 9.52% F Not passing
1/21 20 4.76% F Not passing
0/21 21 0% F Not passing
Standard US scale (A 93%+, B 83%+, C 73%+, D 60%+). Passing is 60%. Change the scale in the test grader settings and this chart updates on your device.

Grading notes for a 21-question test

Twenty-one-question tests often come from three sections of seven questions or a 20-question test with a bonus item.

One wrong answer gives 95.24% (A) and two wrong answers give 90.48% (A-). To pass with 60%, a student needs 13 correct and can miss up to 8.

Because each question moves the score by 4.76%, only 9 of the 11 letter grades on the standard scale can actually be earned on this test: A+, A, A-, B, B-, C, C-, D, F. No whole-number score lands on B+, C+. Half-point scores can fill some of those gaps.

With a bonus question, decide in advance whether a 21/20 can go above 100%. If the extra question is a normal part of the test, use this chart.

What you need for each grade out of 21

The fewest correct answers for each letter grade, and how many questions a student can miss.

  1. A+

    21 of 21 correct (miss up to 0)

  2. A

    20 of 21 correct (miss up to 1)

  3. A-

    19 of 21 correct (miss up to 2)

  4. B+

    19 of 21 correct (miss up to 2)

  5. B

    18 of 21 correct (miss up to 3)

  6. B-

    17 of 21 correct (miss up to 4)

  7. C+

    17 of 21 correct (miss up to 4)

  8. C

    16 of 21 correct (miss up to 5)

  9. C-

    15 of 21 correct (miss up to 6)

  10. D

    13 of 21 correct (miss up to 8)

Each grade starts at its minimum percentage: A+ 97%, A 93%, A- 90%, B+ 87%, B 83%, B- 80%, C+ 77%, C 73%, C- 70%, D 60%.

How to calculate a grade out of 21

  1. Divide the score by the total15 ÷ 21 = 0.7143
  2. Multiply by 1000.7143 × 100 = 71.43%
  3. Read the letter grade71.43% → C-
Works for any score, including half points such as 19.5/21. Use the calculator above for instant results.

Out of 21 grade FAQ

What is 20 out of 21 as a grade?

20 out of 21 is 95.24%, an A on the standard US grading scale. That means 1 wrong answer, and it is a passing score.

What is 18 out of 21 as a grade?

18 out of 21 is 85.71%, a B on the standard US grading scale. That means 3 wrong answers, and it is a passing score.

What is 15 out of 21 as a grade?

15 out of 21 is 71.43%, a C- on the standard US grading scale. That means 6 wrong answers, and it is a passing score.

What is 13 out of 21 as a grade?

13 out of 21 is 61.9%, a D on the standard US grading scale. That means 8 wrong answers, and it is a passing score.

How much is each question worth on a 21 question test?

Each question is worth 100 ÷ 21 = 4.76 percentage points, so every wrong answer lowers the grade by 4.76%. If your questions are worth different points, add up the points instead and divide by the total points possible.

How many questions can you miss on a 21 question test and still pass?

With a 60% pass mark you need at least 13 correct out of 21 (61.9%), so you can miss up to 8 questions and still pass. Some schools use 65% or 70% as the pass mark; you can change it in the test grader settings.

How many do you need for an A or a B out of 21?

An A (93% or higher) needs 20 correct out of 21, so you can miss 1. A B (83% or higher) needs 18 correct, so you can miss 3. On a 10-point scale, where an A starts at 90%, the numbers are a little more forgiving.