13 Out of 15 as a Percentage
Last updated October 20, 2026
13 out of 15 is 86.67%.
- Percentage
- 86.67%
- Decimal
- 0.8667
- As a fraction
- 13/15, already in lowest terms
Divide 13 by 15 to get 0.8667, then multiply by 100: 13 ÷ 15 × 100 = 86.67%. That is a B on the standard US scale and a B on the plus and minus scale.
Details
- Percentage
- 86.67%
- Decimal
- 0.8667
- As a fraction
- 13/15, already in lowest terms
- Letter grade (standard scale)
- B
- Letter grade (plus and minus scale)
- B
- Missed
- 2 of 15
Nearby scores
| Score | Percentage | Letter grade |
|---|---|---|
| 10 out of 15 | 66.67% | D |
| 11 out of 15 | 73.33% | C |
| 12 out of 15 | 80% | B |
| 13 out of 15 | 86.67% | B |
| 14 out of 15 | 93.33% | A |
| 15 out of 15 | 100% | A |
| Grading scale | Letter grade | Grade points (4.0) |
|---|---|---|
| Standard: 90, 80, 70, 60 | B | 3.0 |
| Plus and minus: 97, 93, 90 and so on | B | 3.0 |
| 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: 13 ÷ 15 × 100 = 86.67%. 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 13 out of 15 as a percentage?
13 out of 15 is 86.67%.
What grade is 13 out of 15?
13 out of 15 is 86.67%, which is a B on the standard US scale and a B on the plus and minus scale.
How do I calculate 13 out of 15 as a percentage?
Divide 13 by 15 and multiply by 100: 13 ÷ 15 = 0.8667, and 0.8667 × 100 = 86.67%.
How many did I miss with 13 out of 15?
You missed 2 of 15.