What Grade Is 13 out of 15?
13 out of 15 is 86.67% — a B on the standard US scale, a good score.
- Percentage86.67%
- Letter gradeB
- Missed2 pts
- For an A (90%)14/15
Score breakdown for a 15-point test
| Score | Percent | Letter |
|---|---|---|
| 14/15 | 93.33% | A |
| 12/15 | 80% | B- |
| 11/15 | 73.33% | C |
| 13/15 | 86.67% | B |
How this is calculated
Divide the points earned by the points possible and multiply by 100: 13 ÷ 15 × 100 = 86.67%. On the common 10-point-band scale that lands in the B range — you'd have needed 14/15 to reach the A band.
Common questions
How many points is each letter grade worth on a test?
On the standard scale, each letter band spans 10 percentage points, so on a 50-point test a letter grade is about 5 points, and on a 20-point quiz it's about 2. That's why one careless mistake matters more on short assessments — a single 2-point question on a 20-point quiz is an entire letter grade.
Why does my school's GPA differ from this one?
Schools differ on three things: whether A+ counts as 4.3 or 4.0, whether plus/minus grades are used at all, and whether honors/AP courses are weighted above 4.0. This calculator uses the most common unweighted convention (A+ = 4.0, minus/plus in 0.3 steps). Your registrar's number is the official one.