What Grade Is 64 out of 80?
64 out of 80 is 80% — a B- on the standard US scale, a good score.
- Percentage80%
- Letter gradeB-
- Missed16 pts
- For an A (90%)72/80
Score breakdown for a 80-point test
| Score | Percent | Letter |
|---|---|---|
| 72/80 | 90% | A- |
| 64/80 | 80% | B- |
| 56/80 | 70% | C- |
| 64/80 | 80% | B- |
How this is calculated
Divide the points earned by the points possible and multiply by 100: 64 ÷ 80 × 100 = 80%. On the common 10-point-band scale that lands in the B- range — you'd have needed 72/80 to reach the A band.
Common questions
Is a 90 an A or an A-?
In plus/minus systems, 90–92 is typically an A- and 93+ is an A, which affects GPA (3.7 vs 4.0). In straight-letter systems, everything from 90 up is simply an A. This calculator shows the plus/minus convention because it's the most common — your syllabus decides which applies to you.
Do these calculators store my grades?
No. Everything is computed in your browser the moment you press Calculate — nothing is uploaded, saved or seen by anyone else. Refresh the page and it's gone.