How to Calculate 18 out of 20 as a Percentage
Divide the numerator by the denominator, then multiply by 100. The result is the percentage score.
Step by step: 18 divided by 20 equals 0.9 as a decimal. Multiply that by 100 and you get 90.0%. On the standard US plus/minus grading scale, 90.0% is an A- grade, equal to 3.7 GPA on the 4.0 scale.
What 90.0% Means as an A- Grade
Strong performance. A 3.7 GPA is the Latin Honors (Cum Laude) floor at many universities and the floor for most competitive graduate programs.
At most US colleges and high schools, the minimum passing score is 60%. A score of 90.0% clears that threshold, so 18 out of 20 is a passing grade. Always verify with your institution, as some programs require a C or higher (70%) for courses that count toward major requirements.
Nearby Grade Percentages
The five fractions below have the closest percentage values to 18/20. Each links to its own grade breakdown.
| Fraction | Percentage | Letter grade | GPA (4.0) |
|---|---|---|---|
| 9 out of 10 | 90.0% | A- | 3.7 |
| 27 out of 30 | 90.0% | A- | 3.7 |
| 36 out of 40 | 90.0% | A- | 3.7 |
| 45 out of 50 | 90.0% | A- | 3.7 |
| 54 out of 60 | 90.0% | A- | 3.7 |
Use the grade percentage reference for the complete letter-grade scale, percentage ranges, GPA values, and conversion formula. To convert any score directly, try the test grade calculator.