The standard US 10-point and plus/minus grading scales, plus how to convert percentages to GPA points.
| Percent | Letter | GPA points (4.0 scale) |
|---|---|---|
| 93–100 | A | 4.0 |
| 90–92.9 | A− | 3.7 |
| 87–89.9 | B+ | 3.3 |
| 83–86.9 | B | 3.0 |
| 80–82.9 | B− | 2.7 |
| 77–79.9 | C+ | 2.3 |
| 73–76.9 | C | 2.0 |
| 70–72.9 | C− | 1.7 |
| 67–69.9 | D+ | 1.3 |
| 63–66.9 | D | 1.0 |
| 60–62.9 | D− | 0.7 |
| Below 60 | F | 0.0 |
| Percent | Letter |
|---|---|
| 90–100 | A |
| 80–89.9 | B |
| 70–79.9 | C |
| 60–69.9 | D |
| Below 60 | F |
This scale is common in older systems and some courses; the more granular plus/minus version is more typical in universities.
Each course’s GPA points multiplied by its credit hours, summed, then divided by total credit hours:
GPA = Σ(grade points × credits) ÷ Σ(credits)Example: A in a 3-credit course, B in a 4-credit course:
GPA = (4.0 × 3 + 3.0 × 4) ÷ (3 + 4)
= (12 + 12) ÷ 7
= 3.43On the plus/minus scale, 90% is the boundary — most schools call it an A−. To get a solid A, you need 93%.
Approximately 89–90%, depending on the specific course mix. A 3.5 GPA is roughly between B+ and A− on average.
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