Percentage to Letter Grade Conversion Chart
Updated July 12, 2026 · 6 min read
A percentage from the QuickGrade calculator only tells half the story. Most US schools also record a letter grade, and every school picks its own scale. Below are the three most common conversion tables, plus notes on when each one applies.
Standard 10-point scale
This is the most widely used scale in US K–12 schools. Every ten percentage points is one letter grade lower.
| Letter | Percentage | GPA |
|---|---|---|
| A | 90–100% | 4.0 |
| B | 80–89% | 3.0 |
| C | 70–79% | 2.0 |
| D | 60–69% | 1.0 |
| F | Below 60% | 0.0 |
Plus/minus scale (common in high schools and colleges)
The plus/minus scale splits each letter into three bands. It rewards students at the top of a range and is standard at most US universities.
| Letter | Percentage | GPA |
|---|---|---|
| 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 |
| D− | 60–62% | 0.7 |
| F | Below 60% | 0.0 |
7-point scale (used by some districts)
A 7-point scale, once common in North Carolina and a few other districts, sets A at 93–100, B at 85–92, C at 77–84, D at 70–76, and F below 70. Fewer districts still use it, but you may see it on older transcripts.
Which scale should you use?
- Follow your school's handbook first. A district or school will publish an official scale. Consistency across teachers is more important than picking the "best" scale.
- Match college expectations. Most US colleges use plus/minus. Reporting high-school grades on the same scale simplifies transcripts.
- Write it in the syllabus. Whichever scale you choose, publish it so students and parents can see it before the first assignment goes home.
Rounding rules
There is no universal rule for rounding a 89.5% up to a 90%. Some teachers round to the nearest whole percent before applying the scale; others use the exact number. Whatever you choose, be consistent within a class and disclose it in the syllabus.
Try it with the calculator
Use the QuickGrade calculator to get a percentage from any test or quiz, then look up the letter here. If you grade the same size assignments often, keep the QuickChart printout inside your gradebook.