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Out of 30 Grade Calculator
Enter your points and this calculator turns a score out of 30 into a percentage and a letter grade. It also shows how many more points you needed for the next letter. The formula is score ÷ 30 × 100. For example, 26 out of 30 is 26 ÷ 30 = 0.87, and 0.87 × 100 = 86.67%, which is a B on the College Board style scale and a B on a plain 10-point scale.
Each point out of 30 is worth 3.33%, so scores out of 30 rarely give whole-number percentages. Only multiples of 3 do: 27/30 is exactly 90% and 24/30 is exactly 80%.
On a plain 10-point scale you need 27/30 for an A (90%), 24 for a B, 21 for a C and 18 for a D. The College Board style scale adds plus and minus grades and moves the D cut-off to 65%, which is 19.5/30. 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 total26 ÷ 30 = 0.866667.
- Multiply by 1000.866667 × 100 = 86.67% (4 points lost, 13.33% of the total).
- Look up the letter86.67% is a B. The next letter, B+, starts at 87%, which is 26.1 out of 30 (0.1 more points).
| Letter | Starts at | Minimum score out of 30 |
|---|---|---|
| A+ | 97% | 29.1 |
| A | 93% | 27.9 |
| A− | 90% | 27 |
| B+ | 87% | 26.1 |
| B | 83% | 24.9 |
| B− | 80% | 24 |
| C+ | 77% | 23.1 |
| C | 73% | 21.9 |
| C− | 70% | 21 |
| D+ | 67% | 20.1 |
| D | 65% | 19.5 |
Out of 30 grade chart
Every score from 30 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) |
|---|---|---|---|
| 30/30 | 100% | A+ | A |
| 29/30 | 96.67% | A | A |
| 28/30 | 93.33% | A | A |
| 27/30 | 90% | A− | A |
| 26/30 | 86.67% | B | B |
| 25/30 | 83.33% | B | B |
| 24/30 | 80% | B− | B |
| 23/30 | 76.67% | C | C |
| 22/30 | 73.33% | C | C |
| 21/30 | 70% | C− | C |
| 20/30 | 66.67% | D | D |
| 19/30 | 63.33% | F | D |
| 18/30 | 60% | F | D |
| 17/30 | 56.67% | F | F |
| 16/30 | 53.33% | F | F |
| 15/30 | 50% | F | F |
| 14/30 | 46.67% | F | F |
| 13/30 | 43.33% | F | F |
| 12/30 | 40% | F | F |
| 11/30 | 36.67% | F | F |
| 10/30 | 33.33% | F | F |
| 9/30 | 30% | F | F |
| 8/30 | 26.67% | F | F |
| 7/30 | 23.33% | F | F |
| 6/30 | 20% | F | F |
| 5/30 | 16.67% | F | F |
| 4/30 | 13.33% | F | F |
| 3/30 | 10% | F | F |
| 2/30 | 6.67% | F | F |
| 1/30 | 3.33% | F | F |
| 0/30 | 0% | F | F |
Frequently asked questions
- What is 27 out of 30 as a percentage?
- 27 ÷ 30 × 100 = 90%. That is a A− on the College Board style scale and a A on a plain 10-point scale.
- What is 25 out of 30 as a percentage?
- 25 ÷ 30 × 100 = 83.33%. That is a B on the College Board style scale and a B on a plain 10-point scale.
- What is 24 out of 30 as a percentage?
- 24 ÷ 30 × 100 = 80%. That is a B− on the College Board style scale and a B on a plain 10-point scale.
- How many points can I lose out of 30 and still get an A?
- An A starts at 90% on a plain 10-point scale, which is 27/30. With whole-point marking you can lose 3 points. On the College Board style scale an A (not A−) starts at 93%, which is 27.9/30.
- What is a passing score out of 30?
- With a 60% pass mark you need 18/30. With a 65% pass mark, as on the College Board style scale, you need 19.5/30. Some courses pass at 50% (15/30); check your syllabus.
Last reviewed: October 9, 2026. Calculations run in your browser; nothing you enter is sent anywhere.