What Grade Is 18 out of 20?
18 out of 20 is 90% — an A- on the standard US scale, an excellent score.
- Percentage90%
- Letter gradeA-
- Missed2 pts
- For an A (90%)18/20
Score breakdown for a 20-point test
| Score | Percent | Letter |
|---|---|---|
| 18/20 | 90% | A- |
| 16/20 | 80% | B- |
| 14/20 | 70% | C- |
| 18/20 | 90% | A- |
How this is calculated
Divide the points earned by the points possible and multiply by 100: 18 ÷ 20 × 100 = 90%. On the common 10-point-band scale that lands in the A- range.
Common questions
What GPA do I need for the Dean's List?
Most schools set Dean's List between 3.5 and 3.7 for the semester, with a minimum credit load (often 12+ graded credits). It's a semester GPA, not cumulative — one strong term can make the list even in a rebuilding year. Your school's exact cutoff will be published by the registrar.
How are letter grades calculated from percentages?
Most US schools map percentages to letters in 10-point bands: 90–100 is an A range, 80–89 a B range, 70–79 a C range, 60–69 a D range, and below 60 an F. Plus/minus splits each band roughly in thirds (e.g. 90–92 = A-, 93–96 = A, 97+ = A+). Individual schools and professors can and do vary the cutoffs.