Percentage to Letter Grade: Complete Conversion Chart & Grading Scale
Whether you are a student checking your score, a teacher building a grading rubric, or a parent reviewing a report card, converting a percentage to a letter grade is something you need to do quickly and accurately. Different schools use slightly different scales — but the standard U.S. grading system follows a consistent pattern that this guide covers completely.
Here you will find the full percentage to letter grade chart, how the grading system works, what each letter grade means, and how to convert any score — including the specific decimal percentages that show up in real transcripts.
Percentage to Letter Grade Chart (Standard U.S. Scale)
This is the most widely used grading scale in U.S. high schools, colleges, and universities:
| Percentage | Letter Grade | GPA Points | Description |
|---|---|---|---|
| 97–100% | A+ | 4.0 | Outstanding |
| 93–96% | A | 4.0 | Excellent |
| 90–92% | A− | 3.7 | Very Good |
| 87–89% | B+ | 3.3 | Good |
| 83–86% | B | 3.0 | Above Average |
| 80–82% | B− | 2.7 | Average |
| 77–79% | C+ | 2.3 | Satisfactory |
| 73–76% | C | 2.0 | Average |
| 70–72% | C− | 1.7 | Below Average |
| 67–69% | D+ | 1.3 | Poor |
| 65–66% | D | 1.0 | Barely Passing |
| Below 65% | F | 0.0 | Failing |
Note: Some schools start the D range at 60% instead of 65%, and some do not use plus/minus grades at all. Always check your school’s specific policy.
Letter Grade Percentage Chart — Quick Lookup
Use this table to quickly find what letter grade any percentage earns:
| Percentage | Letter Grade |
|---|---|
| 100% | A+ |
| 99% | A+ |
| 98% | A+ |
| 97% | A+ |
| 96% | A |
| 95% | A |
| 94% | A |
| 93% | A |
| 92% | A− |
| 91% | A− |
| 90% | A− |
| 89% | B+ |
| 88% | B+ |
| 87% | B+ |
| 86% | B |
| 85% | B |
| 84% | B |
| 83% | B |
| 82% | B− |
| 81% | B− |
| 80% | B− |
| 79% | C+ |
| 78% | C+ |
| 77% | C+ |
| 76% | C |
| 75% | C |
| 74% | C |
| 73% | C |
| 72% | C− |
| 71% | C− |
| 70% | C− |
| 69% | D+ |
| 68% | D+ |
| 67% | D+ |
| 66% | D |
| 65% | D |
| 64% and below | F |
Common Decimal Percentages — Letter Grade Reference
Many scores come out as decimals when calculated from points. Here is a quick reference for the most common ones:
| Decimal Percentage | Letter Grade |
|---|---|
| 93.33% | A |
| 91.67% | A− |
| 90.48% | A− |
| 88.89% | B+ |
| 88.57% | B+ |
| 87.5% | B+ |
| 87.14% | B+ |
| 86.67% | B |
| 85.71% | B |
| 85.7% | B |
| 83.33% | B |
| 83.3% | B |
| 81.25% | B− |
| 78.57% | C+ |
| 77.78% | C+ |
| 76.92% | C |
| 76.67% | C |
| 75% | C |
| 73.68% | C |
| 73.33% | C |
| 71.43% | C− |
| 71.429% | C− |
| 68.75% | D+ |
| 67.5% | D+ |
| 66.67% | D |
| 63.64% | F |
| 62.5% | F |
| 58.33% | F |
| 57.14% | F |
Why a 66% Means Different Things in Different Countries
If you searched for “66 letter grade” and were surprised to see a D, you’re not alone — and there’s a good reason. The same percentage carries completely different meanings across grading systems:
| Country / System | What a 66% Means |
|---|---|
| United States | D — barely passing on the standard scale |
| India / Pakistan | First Division — a good result (60%+ is First Division in most boards and universities) |
| United Kingdom | 2:1 (Upper Second-Class Honours) — a strong degree result |
| Canada | Roughly a C, varies by province |
| Australia | Credit — solid performance (65–74% band) |
This is why converting grades between countries by raw percentage alone is misleading. A 66% from an Indian university does not translate to a US D — credential evaluators account for how strict each system’s marking is. If you’re converting international marks for a US application, use our Percentage to GPA Calculator as a starting point, and check the requirements of the institution you’re applying to.
How to Convert Percentage to Letter Grade
Converting a percentage to a letter grade is a two-step process:
Step 1: Calculate the percentage score
Percentage = (Points Earned ÷ Total Points) × 100
Skip the math — our Marks Percentage Calculator converts points to percentage instantly.Step 2: Match the percentage to the grading scale
Example 1:
- Points earned: 42 out of 50
- Percentage = (42 ÷ 50) × 100 = 84%
- Letter Grade = B
Example 2:
- Points earned: 78 out of 90
- Percentage = (78 ÷ 90) × 100 = 86.67%
- Letter Grade = B
Example 3:
- Points earned: 67 out of 80
- Percentage = (67 ÷ 80) × 100 = 83.75%
- Letter Grade = B
Use our free GPA Calculator to go one step further and convert your letter grades into a GPA on a 4.0 scale.
What Is the Grading System?
The U.S. grading system assigns letter grades — A, B, C, D, and F — to represent different levels of academic performance. Each letter corresponds to a percentage range and a GPA point value on the standard 4.0 scale.
How the Letter Grading System Works
The letter grading system was designed to give students, teachers, and institutions a standardized way to communicate academic performance. Instead of comparing raw scores across different tests and assignments, letter grades create a common language.
The system runs from A (highest) to F (failing), with plus and minus variations in between at most schools:
- A range (90–100%) — Strong mastery of the material
- B range (80–89%) — Good understanding with some gaps
- C range (70–79%) — Adequate but not exceptional performance
- D range (65–69%) — Minimal passing performance
- F (below 60% or 65%) — Failing; course credit not earned
Why Schools Use Letter Grades
Letter grades serve several practical purposes:
- They provide a quick, readable summary of performance
- They convert easily to GPA for cumulative academic tracking
- They allow comparison across different courses and institutions
- They communicate clearly to colleges, employers, and graduate programs
To understand how letter grades convert to GPA and how that average is calculated, see our guide on how to calculate your GPA.
Grading Scale Variations: Not All Schools Use the Same Scale
While the standard U.S. scale is the most common, many schools use modified versions. Here are the most common variations:
Standard Scale (Most Common)
| Grade | Percentage |
|---|---|
| A | 93–100% |
| B | 83–92% |
| C | 73–82% |
| D | 65–72% |
| F | Below 65% |
Lenient Scale (Some High Schools)
| Grade | Percentage |
|---|---|
| A | 90–100% |
| B | 80–89% |
| C | 70–79% |
| D | 60–69% |
| F | Below 60% |
Strict Scale (Some Universities)
| Grade | Percentage |
|---|---|
| A | 95–100% |
| B | 85–94% |
| C | 75–84% |
| D | 65–74% |
| F | Below 65% |
10-Point Scale (Some Schools)
Some schools simply use 10-point bands without plus/minus:
| Grade | Percentage |
|---|---|
| A | 90–100% |
| B | 80–89% |
| C | 70–79% |
| D | 60–69% |
| F | Below 60% |
Always check your school’s syllabus or student handbook for the exact grading scale being used — this is especially important in college where individual professors sometimes set their own grading thresholds.
Letter Grade to GPA Conversion
Once you have your letter grade, here is how it converts to GPA points on the standard 4.0 scale:
| Letter Grade | Percentage Range | GPA Value |
|---|---|---|
| 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 | 65–66% | 1.0 |
| F | Below 65% | 0.0 |
Note on A+: Most schools assign A+ the same GPA value as A (4.0). Some schools use 4.3 for A+, but this is less common and is usually part of a weighted or modified system.
To understand how these GPA values are averaged across all your courses, see our guide on what is GPA.
Specific Percentage Conversions — Detailed Reference
A Grade Range (90–100%)
| Score | Letter Grade |
|---|---|
| 96/100 | 96% → A |
| 93.333% | A |
| 90.48% | A− |
B Grade Range (80–89%)
| Score | Letter Grade |
|---|---|
| 86.67% | B |
| 85.71% | B |
| 84/100 | B |
| 83.33% | B |
| 82/100 | B− |
| 81.25% | B− |
| 80% | B− |
C Grade Range (70–79%)
| Score | Letter Grade |
|---|---|
| 78.57% | C+ |
| 77.78% | C+ |
| 76.92% | C |
| 76.67% | C |
| 73.68% | C |
| 73.33% | C |
| 71.43% | C− |
| 71.429% | C− |
D Grade Range (65–69%)
| Score | Letter Grade |
|---|---|
| 68.75% | D+ |
| 67.5% | D+ |
| 66.67% | D |
| 65% | D |
F Grade Range (Below 65%)
| Score | Letter Grade |
|---|---|
| 63.64% | F |
| 62.5% | F |
| 58.33% | F |
| 57.14% | F |
| 50% | F |
Letter Grade Percentage Chart for Middle School and High School
Most middle schools and high schools in the U.S. use the same basic letter grade system, but the exact percentage cutoffs can vary by school district:
| Letter Grade | Typical Range | Some Districts |
|---|---|---|
| A | 90–100% | 93–100% |
| B | 80–89% | 83–92% |
| C | 70–79% | 73–82% |
| D | 60–69% | 65–72% |
| F | Below 60% | Below 65% |
For high school students, understanding your letter grades is especially important because they directly affect your GPA — which colleges use to evaluate your application. See our complete guide on what is a good GPA in high school for benchmarks by school type.
Letter Grade Percentage Chart for College
College grading often uses the same scale as high school, but individual professors and programs may modify it. Here is what to expect:
| Letter Grade | Standard College Range | GPA Value |
|---|---|---|
| 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 | 60–66% | 1.0 |
| F | Below 60% | 0.0 |
Important college-specific notes:
- Many colleges do not use D− as a grade
- Some graduate programs treat a C as the minimum passing grade (not D)
- Pass/Fail courses do not appear in your GPA calculation
- Some majors require a C or above in specific courses for the grade to count toward the degree
For a full breakdown of what GPA ranges mean in a college context, see our guide on what is a good GPA in college.
What Each Letter Grade Means
A (90–100%) — Excellent
An A grade indicates strong mastery of the course material. In the context of GPA, A and A+ both earn 4.0 points. An A− earns 3.7. Students earning consistent As are typically in strong standing for college admissions, scholarships, and academic honors.
B (80–89%) — Good
A B grade indicates good understanding with some room for improvement. B grades earn between 2.7 (B−) and 3.3 (B+) GPA points. A consistent B average produces a GPA around 3.0, which is the national average for both high school and college students.
C (70–79%) — Average
A C grade indicates adequate understanding of basic course requirements. C grades earn between 1.7 (C−) and 2.3 (C+) GPA points. A C average produces a GPA around 2.0, which is the minimum for continued enrollment at most institutions.
D (60–69%) — Below Average
A D grade indicates minimal passing performance. Most schools require D or above to earn course credit, though many programs require C or above for courses that count toward a major. D grades earn 1.0 to 1.3 GPA points.
F (Below 60% or 65%) — Failing
An F grade means the student did not meet the minimum performance requirements. F earns 0.0 GPA points and typically means no credit is awarded for the course. An F significantly damages a cumulative GPA and may affect academic standing.
Key Takeaways
- The standard U.S. letter grade scale runs from A+ (97–100%) to F (below 65%)
- Most schools use either a 10-point band (90/80/70/60) or a more detailed plus/minus system
- Decimal percentages like 86.67% or 83.33% still convert to standard letter grades using the same ranges
- Letter grades convert to GPA points on the 4.0 scale — A/A+ = 4.0, B = 3.0, C = 2.0, D = 1.0, F = 0.0
- Different schools and individual professors may use modified scales — always check the syllabus
- Grading scales vary between middle school, high school, and college — but the standard U.S. scale is consistent across most institutions
Frequently Asked Questions
What percentage is an A?
On the standard U.S. grading scale, an A is 93–96% and an A+ is 97–100%. An A− is 90–92%. Some schools use a simpler scale where any score from 90–100% earns an A without plus/minus distinctions.
What percentage is a B+?
A B+ is 87–89% on the standard U.S. grading scale. It earns 3.3 GPA points on the 4.0 scale.
What is a 78% as a letter grade?
A 78% is a C+ on the standard U.S. grading scale (77–79% range).
What is an 84% as a letter grade?
An 84% is a B on the standard grading scale (83–86% range), earning 3.0 GPA points.
What is a 93% as a letter grade?
A 93% is an A on the standard grading scale (93–96% range), earning 4.0 GPA points.
What is a 66.67% as a letter grade?
A 66.67% falls in the D range (65–66%) on the standard scale. It is a D, earning 1.0 GPA points.
Is 60% passing?
In many U.S. schools using the standard 10-point scale, 60% is the minimum passing grade (D). On scales where the D range starts at 65%, a 60% would be failing. Always check your specific school’s grading policy.
What is a 76.92% as a letter grade?
A 76.92% falls in the C range (73–76.99%) on the standard scale — making it a C, earning 2.0 GPA points.
What is an 86.67% as a letter grade?
An 86.67% falls in the B range (83–86%) on the standard scale — making it a B, earning 3.0 GPA points.
What is a 71.43% as a letter grade?
A 71.43% falls in the C− range (70–72%) on the standard scale, earning 1.7 GPA points.