What Grade Is 13 out of 15? (13/15)
13 out of 15 (13/15) is 86.67%, which rounds to 87%: a B on all three common scales. That is 2 wrong answers and 3.0 GPA points on the 4.0 scale. A gradebook that rounds to 87% first would make it a B+ on the plus and minus scale.
- Percentage
- 86.67%
- rounds to 87%
- 10 point letter
- B
- B with +/-, B on 7 point
- Wrong
- 2
- of 15 questions
- 4.0 GPA
- 3.0
- for a B
One more right, one fewer: 14/15 and 12/15
One more right makes it 14 out of 15, a 93.33%: an A on the 10 point scale. One fewer is 12 out of 15, an 80%, the same B (B- with pluses and minuses). Each question is worth 6.67 percentage points.
The next letter up with pluses and minuses is an A at 14/15 (93.33%), 1 more right answer away. That is also an A on the 10 point scale.
Right answers needed for each letter out of 15
| Letter | Percent | Right | From 13/15 |
|---|---|---|---|
| A | 93 to 100 | 14 or more | 1 more right |
| B | 83 to under 87 | 13 or more | your score |
| B- | 80 to under 83 | 12 or more | 1 fewer |
| C | 73 to under 77 | 11 or more | 2 fewer |
| D | 63 to under 67 | 10 or more | 3 fewer |
| D- | 60 to under 63 | 9 or more | 4 fewer |
| F | below 60 | 8 or fewer | 5 fewer |
Plus and minus scale; the 10 point letter is the plain letter. A-, B+, C+, C- and D+ cannot happen with whole scores out of 15.
86.67% on other test lengths
13/15 is exactly the same grade as 26 out of 30 and 52 out of 60: 86.67%, a B.
Is 13 out of 15 passing?
Yes. Where passing starts at 60%, which is 9 right out of 15, 13/15 clears it by 4 questions. It also passes where the line is 70% (11 right), as on the 7 point scale. Whether a D passes the class is a separate rule, covered in the passing grade guide.
Out of 15 grade chart with 13/15 marked
| Score | Percent | 10 pt | +/- | 7 pt |
|---|---|---|---|---|
| 15/15 | 100% | A | A | A |
| 14/15 | 93.33% | A | A | A |
| 13/15 | 86.67% | B | B | B |
| 12/15 | 80% | B | B- | C |
| 11/15 | 73.33% | C | C | D |
| 10/15 | 66.67% | D | D | F |
| 9/15 | 60% | D | D- | F |
| 8/15 | 53.33% | F | F | F |
| 7/15 | 46.67% | F | F | F |
| 6/15 | 40% | F | F | F |
| 5/15 | 33.33% | F | F | F |
| 4/15 | 26.67% | F | F | F |
| 3/15 | 20% | F | F | F |
| 2/15 | 13.33% | F | F | F |
| 1/15 | 6.67% | F | F | F |
| 0/15 | 0% | F | F | F |
Whole scores; the printable out of 15 chart adds half points, a lookup and a CSV download.
How to calculate 13 out of 15 as a percentage
Divide the number right by the number of questions, multiply by 100, then find the band on your school's scale. CurveFox reads the letter from the exact percent, the same rule as the grading scale chart.
Next step: put this test into your class grade with the grade calculator, see what the final needs with the final grade calculator, or curve a whole class with the grade curve calculator.
13/15 as a percent: worked example
You get 13 right on a 15 question test. What is the percent and the letter?
- 13 / 15 = 0.8667
- 0.8667 x 100 = 86.67%, 87% rounded to a whole percent
- 86.67 is a B on all three scales (83 to under 87 with pluses and minuses)
13/15 is 86.67%: a B on all three common scales.
Questions and answers
Is a 13 out of 15 a good grade?
86.67% is a good, above average score on the 10 point scale (a B). An A takes 14 right, 1 more right answer than 13. It passes on every common scale.
What do I need for the next letter after 13/15?
14 right out of 15 (93.33%) is an A with pluses and minuses, 1 more question than 13. That is also an A on the 10 point scale.
Does 13/15 round up to a higher letter?
Only if your teacher rounds first. 86.67% rounds to 87%, which would give a B+ instead of a B on the plus and minus scale. Read from the exact percent, the letter stays as shown; your syllabus says which rule applies.
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