21 Out of 30 as a Percentage
Last updated October 20, 2026
21 out of 30 is 70%.
- Percentage
- 70%
- Decimal
- 0.7
- As a fraction
- 7/10 in lowest terms
Divide 21 by 30 to get 0.7, then multiply by 100: 21 ÷ 30 × 100 = 70%. That is a C on the standard US scale and a C- on the plus and minus scale.
Details
- Percentage
- 70%
- Decimal
- 0.7
- As a fraction
- 7/10 in lowest terms
- Letter grade (standard scale)
- C
- Letter grade (plus and minus scale)
- C-
- Missed
- 9 of 30
Nearby scores
| Score | Percentage | Letter grade |
|---|---|---|
| 18 out of 30 | 60% | D |
| 19 out of 30 | 63.33% | D |
| 20 out of 30 | 66.67% | D |
| 21 out of 30 | 70% | C |
| 22 out of 30 | 73.33% | C |
| 23 out of 30 | 76.67% | C |
| 24 out of 30 | 80% | B |
| Grading scale | Letter grade | Grade points (4.0) |
|---|---|---|
| Standard: 90, 80, 70, 60 | C | 2.0 |
| Plus and minus: 97, 93, 90 and so on | C- | 1.7 |
| Seven-point: 93, 85, 77, 70 | D | 1.0 |
How the percentage is calculated
The percentage is the score divided by the total, times 100: 21 ÷ 30 × 100 = 70%. The letter grade uses the common US scale: 90 and above is an A, 80 to 89 a B, 70 to 79 a C, 60 to 69 a D, and below 60 an F. Your school's scale may differ.
Every question is treated as worth the same number of points. For any other score, use the test grade calculator, which also shows a full grade chart, or the percentage calculator.
Frequently asked questions
What is 21 out of 30 as a percentage?
21 out of 30 is 70%.
What grade is 21 out of 30?
21 out of 30 is 70%, which is a C on the standard US scale and a C- on the plus and minus scale.
How do I calculate 21 out of 30 as a percentage?
Divide 21 by 30 and multiply by 100: 21 ÷ 30 = 0.7, and 0.7 × 100 = 70%.
How many did I miss with 21 out of 30?
You missed 9 of 30.