18 Out of 28 Grade: Percentage, Letter Grade & GPA
18 out of 28 is 64.29%. That is a D (1.0 GPA) on the standard A–F scale and a D (1.0 GPA) on the plus-minus scale. It passes where the minimum is 60%, but it falls short of the 70% (C) that many courses require.
Check Your Own Score
You need 19.6 out of 28 (70%) for the next grade (C).
Key Takeaways
- Percentage: 18/28 = 64.29%
- Letter grade: D (standard), D (plus-minus), F (7-point scale)
- GPA: 1.0 (standard), 1.0 (plus-minus)
- Passing: Only where the cutoff is 60%
- Next grade needs: 19.6/28 (70%) for a C
What Does 18 Out of 28 Mean?
Getting 18 out of 28 means 18 correct answers and 10 wrong or missed ones. Each question on a 28-question test is worth 3.57%, so every mistake costs a small but real amount. 10 questions cost you 35.71% of the points. In simple words, you got 18 of 28 questions right, which is about 6.43 out of every 10.
The formula is correct answers ÷ total questions × 100:
18 ÷ 28 × 100 = 64.29%
| Score | Percentage | Standard | Plus-minus | GPA |
|---|---|---|---|---|
| 18/28 | 64.29% | D | D | 1.0 / 1.0 |
You earned 64.29% of the points and missed 35.71%. Schools use different scales, so check your syllabus.
18/28 as a Fraction, Decimal, Ratio, and Equal Scores
18/28 simplifies to 9/14. As a decimal, it is 0.6429. As a ratio, it is 9:14, and as a percentage, it is 64.29%. It also equals 6.43 out of 10 and 12.86 out of 20. Scores with a different total can be compared by their percentage.
Is 18 Out of 28 a Good Grade?
18 out of 28 is a below-average result. You earned 64.29%, which is a D on both A–F scales. It clears a 60% cutoff, but it does not reach the 70% or C that many courses and programs require.
A D often points to an uneven result: solid on some topics and weak on others. Your mistakes matter more than the score itself, so sort them by topic.
Grading Chart for a 28-Question Test
| Correct | Wrong | Percentage | Standard | Plus-minus |
|---|---|---|---|---|
| 22 | 6 | 78.57% | C | C+ |
| 21 | 7 | 75% | C | C |
| 20 | 8 | 71.43% | C | C− |
| 19 | 9 | 67.86% | D | D |
| 18 | 10 | 64.29% | D | D |
| 17 | 11 | 60.71% | D | D |
| 16 | 12 | 57.14% | F | F |
| 15 | 13 | 53.57% | F | F |
| 14 | 14 | 50% | F | F |
Scores below 17 out of 28 are an F on both scales.
Minimum Score for Each Grade on a 28-Question Test
On the standard scale, a 28-question test needs at least 26 correct for an A, 23 for a B, 20 for a C, and 17 for a D.
| Grade | Cutoff | Points needed | Minimum correct | Your 18/28 |
|---|---|---|---|---|
| A | 90% | 25.2 | 26 | 7.2 short |
| B | 80% | 22.4 | 23 | 4.4 short |
| C | 70% | 19.6 | 20 | 1.6 short |
| D | 60% | 16.8 | 17 | 1.2 above |
How Is the Letter Grade for 18/28 Decided?
The percentage is matched to a grading scale. On the standard scale, 60% up to 70% is a D, so 64.29% is a D. On the plus-minus scale, 60% up to 70% is a D, so 64.29% is a D.
| Percentage | Standard | Plus-minus | GPA (standard) |
|---|---|---|---|
| 90–100% | A | A+, A, A− | 4.0 |
| 80–89% | B | B+, B, B− | 3.0 |
| 70–79% | C | C+, C, C− | 2.0 |
| 60–69% | D | D | 1.0 |
| Below 60% | F | F | 0.0 |
How to Use the Calculator Above
Type 28 as the total points and 18 as the points you earned. To enter a score with decimals, such as 17.75 or 18.33, tick Allow decimal points first. The calculator also shows how many points you need for the next grade, which is 19.6/28 (70%) for a C. Switch to the plus-minus scale to see how the letter changes. You can also check any other score with Easy Grader.
When 18/28 May Not Match Your Final Grade
The calculator gives the grade for this one score. These six things can change how it counts toward your final grade:
Weighted Categories
A question-based test counts only as much as your teacher weights it. At a 10% weight, 64.29% adds about 6.43 of the 10 available points.
Extra Credit
18/28 plus 1 bonus point becomes 19/28 (67.86%). Some teachers allow totals above 100%.
Dropped Scores
If your course drops the lowest score, one weak result can disappear from your average. Check your syllabus for this rule.
Curved Tests
Curved tests adjust everyone’s score. Use the curved score, not the raw one, when you calculate your percentage.
Rounding Rules
Rounding 64.29% to 64% keeps you in the same grade range on both scales, so rounding does not change this grade.
Pass/Fail Courses
Pass/fail and mastery courses care about the cutoff, not the letter. The cutoff is usually 60% or 70%.
If your recorded score ever looks wrong, remember that 18 ÷ 28 is always 64.29%, so ask your teacher to check it.
Real Examples With 18 Out of 28
A weighted test. If this test is worth 10% of your final grade, 64.29% gives you about 6.43 of those 10 points. At a 20% weight, it gives about 12.86 of 20.
Averaging with your next test. If your next 28-question test is a perfect 28/28, the two scores average 82.14%, which is a B. If it is 14/28, they average 57.14%, which is an F.
Reaching the next grade. To reach a C you need 19.6/28 (70%). On a whole-number test, that means 20 correct answers.
How to Improve Your Grade
You are 1.6 points from a C. Start with the questions you missed. If most come from one topic, review that topic first. A day later, redo them from memory to check that the corrections stuck.
- List the questions you missed and label each as a careless error, a skipped topic, or a misunderstood concept.
- Study the topic behind the most misses first, and redo those questions without notes.
- Set a target of 19.6/28 or higher on the next test, which is a C on the standard scale.
Frequently Asked Questions
Is 18 Out of 28 a Good Grade?
No. 18 out of 28 is 64.29%, a D. It is below average and leaves little room for error.
Is 18 Out of 28 Passing?
It depends on the cutoff. 64.29% passes at 60% but not at 70%.
What Is 18/28 as a Percentage?
18 ÷ 28 × 100 = 64.29%.
What GPA Is 18 Out of 28?
64.29% equals a 1.0 GPA on the standard A–F scale and a 1.0 GPA on the plus-minus scale.
How Many More Points Do I Need for the Next Grade?
You need 19.6 out of 28 (70%) for a C. That is 1.6 more points than you have now.
How Many Can I Miss on a 28-Question Test and Still Get a D?
You can miss 11 and still get a D on the standard scale, which needs at least 17 out of 28. Missing 12 drops you to 57.14%, an F.
What Grade Is 18 Out of 28 on a 7-Point Scale?
F. A 7-point scale uses cutoffs of 93% (A), 85% (B), 77% (C), and 70% (D), and 18/28 is 64.29%.
What Is 18/28 as a Fraction, Decimal, and Ratio?
18/28 equals 9/14, or 0.6429 as a decimal, and its ratio is 9:14. As a score out of 10, it is 6.43.
Other Scores on a 28-Question Test
Written by
Muhammad Umer Shuaib
Author & Grading Tools Developer, Easy Grader
Muhammad Umer Shuaib builds and maintains the grading calculators on Easy Grader. Before a page goes live, he checks every percentage, letter grade, and GPA conversion against the standard US A–F and plus-minus grading scales, and tests the calculator on real score examples. He writes these guides so students, teachers, and parents can get a clear, accurate answer without doing the math or guessing which scale applies.