18 Out of 20 Grade: Percentage, Letter Grade & GPA
18 out of 20 is 90%. That is an A (4.0 GPA) on the standard A–F scale and an A− (3.7 GPA) on the plus-minus scale. It is a passing grade and an excellent result.
Check Your Own Score
This is the highest grade available on this scale.
Key Takeaways
- Percentage: 18/20 = 90%
- Letter grade: A (standard), A− (plus-minus), B (7-point scale)
- GPA: 4.0 (standard), 3.7 (plus-minus)
- Passing: Yes, at both the 60% and 70% cutoffs
- Next grade needs: None on the standard scale, because A is the top grade
What Does 18 Out of 20 Mean?
Getting 18 out of 20 means 18 correct answers and 2 wrong or missed ones. Each question on a 20-question test is worth 5%, so every mistake costs a noticeable amount. 2 questions cost you 10% of the points. In simple words, you got 18 of 20 questions right, which is about 9 out of every 10.
The formula is correct answers ÷ total questions × 100:
18 ÷ 20 × 100 = 90%
| Score | Percentage | Standard | Plus-minus | GPA |
|---|---|---|---|---|
| 18/20 | 90% | A | A− | 4.0 / 3.7 |
You earned 90% of the points and missed 10%. Schools use different scales, so check your syllabus.
18/20 as a Fraction, Decimal, Ratio, and Equal Scores
18/20 simplifies to 9/10. As a decimal, it is 0.9. As a ratio, it is 9:10, and as a percentage, it is 90%. It also equals 9 out of 10 and 18 out of 20. Any score with the same ratio earns the same grade:
| Equal score | Percentage | Standard | Plus-minus |
|---|---|---|---|
| 18/20 | 90% | A | A− |
| 9/10 | 90% | A | A− |
| 27/30 | 90% | A | A− |
| 36/40 | 90% | A | A− |
| 45/50 | 90% | A | A− |
| 54/60 | 90% | A | A− |
Is 18 Out of 20 a Good Grade?
18 out of 20 is an excellent result. You earned 90% and missed only 2 questions, which keeps you above the 90% line for an A on the standard scale. On the plus-minus scale, it is an A−.
Scores like this usually reflect solid understanding with a few small slips. Looking at the 2 questions you missed shows whether they were careless errors or gaps in one topic.
Grading Chart for a 20-Question Test
| Correct | Wrong | Percentage | Standard | Plus-minus |
|---|---|---|---|---|
| 20 | 0 | 100% | A | A+ |
| 19 | 1 | 95% | A | A |
| 18 | 2 | 90% | A | A− |
| 17 | 3 | 85% | B | B |
| 16 | 4 | 80% | B | B− |
| 15 | 5 | 75% | C | C |
| 14 | 6 | 70% | C | C− |
| 13 | 7 | 65% | D | D |
| 12 | 8 | 60% | D | D |
| 11 | 9 | 55% | F | F |
Scores below 12 out of 20 are an F on both scales.
Minimum Score for Each Grade on a 20-Question Test
On the standard scale, a 20-question test needs at least 18 correct for an A, 16 for a B, 14 for a C, and 12 for a D.
| Grade | Cutoff | Points needed | Minimum correct | Your 18/20 |
|---|---|---|---|---|
| A | 90% | 18 | 18 | Exactly at cutoff |
| B | 80% | 16 | 16 | 2 above |
| C | 70% | 14 | 14 | 4 above |
| D | 60% | 12 | 12 | 6 above |
How Is the Letter Grade for 18/20 Decided?
The percentage is matched to a grading scale. On the standard scale, 90% and above is an A, so 90% is an A. On the plus-minus scale, 90% up to 93% is an A−, so 90% is an A−.
| 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
Start with the total (20) and your score (18). 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 None on the standard scale, because A is the top grade. Switch to the plus-minus scale to see how the letter changes. You can also check any other score with the online grade calculator.
When 18/20 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, 90% adds about 9 of the 10 available points.
Extra Credit
18/20 plus 1 bonus point becomes 19/20 (95%). Some teachers allow totals above 100%.
Dropped Scores
Dropping the lowest grade is common in courses with many quizzes. A score like this may or may not count, depending on your class.
Curved Tests
A curve changes your raw score before it becomes a percentage. Add the curve first, then divide by the total.
Rounding Rules
Rounding 90% to 90% keeps you in the same grade range on both scales, so rounding does not change this grade.
Pass/Fail Courses
Some courses report only pass or fail. In that case your school’s cutoff, often 60% or 70%, decides the result.
If your recorded score ever looks wrong, remember that 18 ÷ 20 is always 90%, so ask your teacher to check it.
Real Examples With 18 Out of 20
A weighted test. If this test is worth 10% of your final grade, 90% gives you about 9 of those 10 points. At a 20% weight, it gives about 18 of 20.
Averaging with your next test. If your next 20-question test is a perfect 20/20, the two scores average 95%, which is an A. If it is 10/20, they average 70%, which is a C.
Reaching the next grade. A is the top grade on the standard scale. On plus-minus scales, an A+ starts at 97%, which needs 20/20.
How to Improve Your Grade
You are already in the top grade range. To keep it, review the 2 questions you missed and make sure the same mistakes do not return on the next test.
- Look at the 2 missed questions and find the exact step where each went wrong.
- Decide whether each miss was careless or a gap in knowledge.
- Keep the same routine for the next test, and use the last few minutes to re-check answers.
Frequently Asked Questions
Is 18 Out of 20 a Good Grade?
Yes. 18 out of 20 is 90%, an excellent grade that is well above average.
Is 18 Out of 20 Passing?
Yes. 90% clears both common passing marks, 60% and 70%.
What Is 18/20 as a Percentage?
18 ÷ 20 × 100 = 90%.
What GPA Is 18 Out of 20?
90% equals a 4.0 GPA on the standard A–F scale and a 3.7 GPA on the plus-minus scale.
How Many More Points Do I Need for the Next Grade?
None on the standard scale, because A is the top grade. On plus-minus scales, an A+ starts at 97%.
How Many Can I Miss on a 20-Question Test and Still Get An A?
You can miss 2 and still get an A on the standard scale, which needs at least 18 out of 20. Missing 3 drops you to 85%, a B.
What Grade Is 18 Out of 20 on a 7-Point Scale?
B. A 7-point scale uses cutoffs of 93% (A), 85% (B), 77% (C), and 70% (D), and 18/20 is 90%.
What Is 18/20 as a Fraction, Decimal, and Ratio?
18/20 equals 9/10, or 0.9 as a decimal, and its ratio is 9:10. As a score out of 10, it is 9.
Other Scores on a 20-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.