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Out of 15 Grade Calculator
Enter your points and this calculator turns a score out of 15 into a percentage and a letter grade. It also shows how many more points you needed for the next letter. The formula is score ÷ 15 × 100. For example, 12 out of 15 is 12 ÷ 15 = 0.8, and 0.8 × 100 = 80%, which is a B− on the College Board style scale and a B on a plain 10-point scale.
Short quizzes are often marked out of 15. Each point is worth 6.67%, so a single mistake drops a perfect score to 93.33%, still an A on the College Board style scale, and two mistakes give 86.67%.
On a plain 10-point scale you need 13.5/15 for an A (90%), 12 for a B, 10.5 for a C and 9 for a D. The College Board style scale adds plus and minus grades and moves the D cut-off to 65%, which is 9.75/15. Schools set their own scales, so use the one in your syllabus if it differs. If your test had a different total, for example extra-credit questions, change the ‘Out of’ box and the calculator still works.
Result and step-by-step working
Letter grade: B− on the College Board style (A+ 97, A 93, A− 90 … D 65) scale
- Divide the score by the total12 ÷ 15 = 0.8.
- Multiply by 1000.8 × 100 = 80% (3 points lost, 20% of the total).
- Look up the letter80% is a B−. The next letter, B, starts at 83%, which is 12.45 out of 15 (0.45 more points).
| Letter | Starts at | Minimum score out of 15 |
|---|---|---|
| A+ | 97% | 14.55 |
| A | 93% | 13.95 |
| A− | 90% | 13.5 |
| B+ | 87% | 13.05 |
| B | 83% | 12.45 |
| B− | 80% | 12 |
| C+ | 77% | 11.55 |
| C | 73% | 10.95 |
| C− | 70% | 10.5 |
| D+ | 67% | 10.05 |
| D | 65% | 9.75 |
Out of 15 grade chart
Every score (in half points) from 15 down to 0, with the percentage and the letter grade on two common US scales. College Board style: A+ 97, A 93, A− 90, B+ 87, B 83, B− 80, C+ 77, C 73, C− 70, D+ 67, D 65, F below 65. Plain 10-point: A 90, B 80, C 70, D 60, F below 60.
| Score | Percent | Letter (College Board style) | Letter (plain 10-point) |
|---|---|---|---|
| 15/15 | 100% | A+ | A |
| 14.5/15 | 96.67% | A | A |
| 14/15 | 93.33% | A | A |
| 13.5/15 | 90% | A− | A |
| 13/15 | 86.67% | B | B |
| 12.5/15 | 83.33% | B | B |
| 12/15 | 80% | B− | B |
| 11.5/15 | 76.67% | C | C |
| 11/15 | 73.33% | C | C |
| 10.5/15 | 70% | C− | C |
| 10/15 | 66.67% | D | D |
| 9.5/15 | 63.33% | F | D |
| 9/15 | 60% | F | D |
| 8.5/15 | 56.67% | F | F |
| 8/15 | 53.33% | F | F |
| 7.5/15 | 50% | F | F |
| 7/15 | 46.67% | F | F |
| 6.5/15 | 43.33% | F | F |
| 6/15 | 40% | F | F |
| 5.5/15 | 36.67% | F | F |
| 5/15 | 33.33% | F | F |
| 4.5/15 | 30% | F | F |
| 4/15 | 26.67% | F | F |
| 3.5/15 | 23.33% | F | F |
| 3/15 | 20% | F | F |
| 2.5/15 | 16.67% | F | F |
| 2/15 | 13.33% | F | F |
| 1.5/15 | 10% | F | F |
| 1/15 | 6.67% | F | F |
| 0.5/15 | 3.33% | F | F |
| 0/15 | 0% | F | F |
Frequently asked questions
- What is 12 out of 15 as a percentage?
- 12 ÷ 15 × 100 = 80%. That is a B− on the College Board style scale and a B on a plain 10-point scale.
- What is 13 out of 15 as a percentage?
- 13 ÷ 15 × 100 = 86.67%. That is a B on the College Board style scale and a B on a plain 10-point scale.
- What is 10 out of 15 as a percentage?
- 10 ÷ 15 × 100 = 66.67%. That is a D on the College Board style scale and a D on a plain 10-point scale.
- How many points can I lose out of 15 and still get an A?
- An A starts at 90% on a plain 10-point scale, which is 13.5/15. With whole-point marking you can lose 1 point. On the College Board style scale an A (not A−) starts at 93%, which is 13.95/15.
- What is a passing score out of 15?
- With a 60% pass mark you need 9/15. With a 65% pass mark, as on the College Board style scale, you need 9.75/15. Some courses pass at 50% (7.5/15); check your syllabus.
Last reviewed: October 9, 2026. Calculations run in your browser; nothing you enter is sent anywhere.