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| Grade | Correct | Incorrect | Percent | GPA |
|---|
What Is 18 out of 20? Percentage, Grade & GPA
By Sachin Yadav
Eighteen correct answers out of twenty comes to 90%, an A- on the standard grading scale and 30 points above the usual 60% passing mark. As a fraction, 18/20 simplifies to 9/10, meaning 9 out of every 10 questions were answered correctly. This page covers the math behind the percentage, where 90% sits on the full letter grade table, and the GPA points tied to this score.
What does 18 out of 20 mean?
Percentage = (Correct ÷ Total) × 100
18 ÷ 20 = 0.90, multiplied by 100 gives 90%. Divide both numbers by 2 and the fraction simplifies to 9/10.
| Metric | Value |
|---|---|
| Correct answers | 18 |
| Total questions | 20 |
| Simplified fraction | 9/10 |
| Percentage | 90% |
| Letter grade | A- |
| GPA points | 3.7 |
| Points above passing (60%) | 30 |
18/20 grade on the US grading scale
| Percentage | Letter grade | GPA points |
|---|---|---|
| 97-100 | A+ | 4.0 |
| 93-96 | A | 4.0 |
| 90-92 | A- (90%) | 3.7 |
| 87-89 | B+ | 3.3 |
| 83-86 | B | 3.0 |
| 80-82 | B- | 2.7 |
| 77-79 | C+ | 2.3 |
| 73-76 | C | 2.0 |
| 70-72 | C- | 1.7 |
| 67-69 | D+ | 1.3 |
| 63-66 | D | 1.0 |
| 60-62 | D- | 0.7 |
| Below 60 | F | 0.0 |
A 90% sits right at the entry point of the A range, 3 points above the B+ cutoff and 3 points short of a full A. In the 1930s, the University of Chicago is often cited among the schools that dropped the letter E from their grading scale and replaced it with F, since E was too easily confused with “Excellent.”
How to use the grade calculator
- Enter the total number of questions, 20, into the first field.
- Enter the number of correct answers, 18, into the second field.
- The calculator shows the percentage, letter grade, and GPA points at once.
A middle school teacher in Missouri grading a 20-question vocabulary quiz can type in each student’s raw score and get the letter grade instantly instead of working out the percentage by hand for every paper. The tool also has a GPA mode for report cards and a pass/fail mode for courses that skip letter grades entirely.
Real-world examples
A 6th grade teacher in Wisconsin grades a 20-question fractions quiz and finds a student scored 18 after two mistakes on mixed numbers.
A high school student in Arizona checks a 20-question U.S. history quiz and counts 18 correct answers after missing two questions on dates.
A college student in Delaware takes a 20-question psychology quiz and scores 18 out of 20 after two questions on research methods.
Compare with nearby scores
17 out of 20 sits just below at 85%, a B, and 19 out of 20 sits just above at 95%, an A.
When not to rely only on this calculator
Weighted grades: if the 20 questions count for only part of a semester grade, use the weighted grade calculator instead.
Curved tests: apply any class curve before checking the letter grade here.
Pass/fail courses: some programs set a different cutoff than 60%, so check the passing score calculator for a specific policy.
Semester GPA: one test score isn’t a full semester GPA. Combine multiple grades with the GPA calculator.
Instructor disputes: this calculator confirms the math is correct. Any disagreement about the score itself belongs with the teacher, and the final grade calculator can help track how one score affects a course total.
Frequently asked questions
Is 18 out of 20 a good grade?
Yes. It’s 90%, an A-, one of the stronger results on the scale.
What is 18/20 as a percentage?
18 out of 20 equals 90%.
What is 18/20 simplified as a fraction?
18/20 reduces to 9/10.
What GPA is 18 out of 20?
3.7 grade points on the standard 4.0 scale.
Is 18 out of 20 passing?
Yes, by a wide margin, 30 points above the 60% passing mark.
Sources: ERIC | National Center for Education Statistics | U.S. Department of Education
Related tools: Average grade calculator | GPA calculator