18 Out of 20 as a Percentage
Last updated October 20, 2026
18 out of 20 is 90%.
- Percentage
- 90%
- Decimal
- 0.9
- As a fraction
- 9/10 in lowest terms
Divide 18 by 20 to get 0.9, then multiply by 100: 18 ÷ 20 × 100 = 90%. That is a A on the standard US scale and a A- on the plus and minus scale.
Details
- Percentage
- 90%
- Decimal
- 0.9
- As a fraction
- 9/10 in lowest terms
- Letter grade (standard scale)
- A
- Letter grade (plus and minus scale)
- A-
- Missed
- 2 of 20
Nearby scores
| Score | Percentage | Letter grade |
|---|---|---|
| 15 out of 20 | 75% | C |
| 16 out of 20 | 80% | B |
| 17 out of 20 | 85% | B |
| 18 out of 20 | 90% | A |
| 19 out of 20 | 95% | A |
| 20 out of 20 | 100% | A |
| Grading scale | Letter grade | Grade points (4.0) |
|---|---|---|
| Standard: 90, 80, 70, 60 | A | 4.0 |
| Plus and minus: 97, 93, 90 and so on | A- | 3.7 |
| Seven-point: 93, 85, 77, 70 | B | 3.0 |
How the percentage is calculated
The percentage is the score divided by the total, times 100: 18 ÷ 20 × 100 = 90%. 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 18 out of 20 as a percentage?
18 out of 20 is 90%.
What grade is 18 out of 20?
18 out of 20 is 90%, which is a A on the standard US scale and a A- on the plus and minus scale.
How do I calculate 18 out of 20 as a percentage?
Divide 18 by 20 and multiply by 100: 18 ÷ 20 = 0.9, and 0.9 × 100 = 90%.
How many did I miss with 18 out of 20?
You missed 2 of 20.