Reference
Letter Grade to Percentage: How the Conversion Works
Letter grades (A, B, C, D, F) are how most schools summarise a percentage score. The exact ranges differ by institution, but a common US reference looks like this:
| Letter | Percentage range | GPA points |
|---|---|---|
| A+ | 97–100% | 4.0 |
| A | 93–96% | 4.0 |
| A- | 90–92% | 3.7 |
| B+ | 87–89% | 3.3 |
| B | 83–86% | 3.0 |
| B- | 80–82% | 2.7 |
| C+ | 77–79% | 2.3 |
| C | 73–76% | 2.0 |
| C- | 70–72% | 1.7 |
| D+ | 67–69% | 1.3 |
| D | 63–66% | 1.0 |
| F | 0–62% | 0.0 |
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Check Price on Amazon →Why the ranges differ between schools
- Cutoff points: some schools start an A at 90%, others at 93%.
- Plus/minus: not every school uses A- / B+ steps.
- Weighted courses: AP, IB and honors classes may map to 4.5 or 5.0 instead of 4.0.
Use the tools
Turn a percentage into a letter with the grade converter, compute a full GPA with the GPA calculator, or plan the score you need on a final with the final grade calculator.
Key point: the table above is a common reference, not a universal rule. When it matters, always use your own school’s official scale.
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