21 out of 30 as a percentage
21 / 30 x 100 = 70%
Letter grades here use the standard 10-point scale (A 90+, B 80+, C 70+, D 60+, F below 60). Your school's scale may differ — check your syllabus, or use the Test Grade Calculator where the scale is configurable.
How to Calculate 21 out of 30 as a Percentage
Divide the numerator by the denominator, then multiply by 100. Using the real numbers:
percent = (X / Y) x 100
percent = (21 / 30) x 100
percent = 0.7 x 100 = 70%
On the standard 10-point letter-grade scale, 70% maps to a letter grade of C, which carries a GPA value of 2.0.
Is 21 out of 30 a Good Score?
70% is an average, passing score. 21 out of 30 meets the baseline for most courses — you have demonstrated acceptable knowledge of the material. A C means you are passing, though further review of weaker areas could meaningfully raise your grade next time.
Score Reference Table — Out of 30
All 31 possible scores on a 30-point assessment, with percentages and letter grades. Your score is highlighted.
| Score | Percentage | Letter |
|---|---|---|
| 30/30 | 100% | A |
| 29/30 | 96.7% | A |
| 28/30 | 93.3% | A |
| 27/30 | 90% | A |
| 26/30 | 86.7% | B |
| 25/30 | 83.3% | B |
| 24/30 | 80% | B |
| 23/30 | 76.7% | C |
| 22/30 | 73.3% | C |
| 21/30 | 70% | C |
| 20/30 | 66.7% | D |
| 19/30 | 63.3% | D |
| 18/30 | 60% | D |
| 17/30 | 56.7% | F |
| 16/30 | 53.3% | F |
| 15/30 | 50% | F |
| 14/30 | 46.7% | F |
| 13/30 | 43.3% | F |
| 12/30 | 40% | F |
| 11/30 | 36.7% | F |
| 10/30 | 33.3% | F |
| 9/30 | 30% | F |
| 8/30 | 26.7% | F |
| 7/30 | 23.3% | F |
| 6/30 | 20% | F |
| 5/30 | 16.7% | F |
| 4/30 | 13.3% | F |
| 3/30 | 10% | F |
| 2/30 | 6.7% | F |
| 1/30 | 3.3% | F |
| 0/30 | 0% | F |
Letter Grade Breakdown
- A — 90% and above (4.0 GPA)
- B — 80%–89.9% (3.0 GPA)
- C — 70%–79.9% (2.0 GPA)
- D — 60%–69.9% (1.0 GPA)
- F — below 60% (0.0 GPA)
Grade a Test with These Numbers
If you answered 21 out of 30 questions correctly, your score is 70% — a letter grade of C. You got 9 questions wrong.
Use the Test Grade Calculator (pre-filled for 30 questions, 9 wrong) for a full grading-scale table. Or convert any percentage with the Percent to Letter Grade converter.
Frequently Asked Questions
What is 21 out of 30 as a percentage?
21 out of 30 as a percentage is 70%. The formula is (21 divided by 30) times 100 = 70%. On the standard 10-point grading scale that is a C (2.0 GPA).
Is 21 out of 30 a passing grade?
Yes — 70% (21/30) is a passing score on the standard 10-point scale. It earns a letter grade of C. Most courses require at least 60% (a D) to pass, though some programs require a C (70%) or higher for credit toward your major.
How many questions did I get wrong if I scored 21 out of 30?
You got 9 questions wrong out of 30. That is 30% incorrect, leaving you with a score of 70% (C).
Nearby Scores — Out of 30
- 20 out of 30 = 66.7% (D)
- 21 out of 30 = 70% (C) — current
- 22 out of 30 = 73.3% (C)