You just got your test back and it says 84%. But is that a B or a B+? And what does that mean for your GPA? Converting a percentage score to a letter grade sounds simple — but with different grading scales used by different schools and teachers, it can get confusing fast.
In this guide, we will show you exactly how to convert any percentage to a letter grade, explain why grading scales differ between schools, and give you a complete reference table you can use any time. Whether you are a student tracking your grades or a parent trying to understand a report card, this guide has everything you need.
| Quick Answer: In the most common US grading scale, 90–100% is an A, 80–89% is a B, 70–79% is a C, 60–69% is a D, and anything below 60% is an F. However, some schools use a stricter scale where 93% or above is required for an A. |
What Is a Letter Grade?
A letter grade is a simplified way of representing academic performance. Instead of showing a raw percentage or point score, a letter grade gives a quick snapshot of how well a student performed in a course or on a specific assignment.
Letter grades are used across high schools, colleges, and universities throughout the United States and many other countries. They serve as the foundation for calculating your GPA — which is why understanding the conversion from percentage to letter grade is so important.
Here is why letter grades matter:
- They determine your GPA, which affects college admissions and scholarships
- They appear on your official transcript and academic record
- They give you a quick way to gauge your performance in each course
- They help you identify which subjects need more attention
The Complete Letter Grade Scale (With GPA Points)
Below is the standard letter grade scale used by most schools and colleges in the United States. Use this as your primary reference when converting any percentage to a letter grade:
| Letter Grade | Percentage | GPA Points | Performance Level |
| A+ | 97 – 100% | 4.0 | Exceptional |
| A | 93 – 96% | 4.0 | Excellent |
| A- | 90 – 92% | 3.7 | Very Good |
| B+ | 87 – 89% | 3.3 | Above Average |
| B | 83 – 86% | 3.0 | Good |
| B- | 80 – 82% | 2.7 | Slightly Above Average |
| C+ | 77 – 79% | 2.3 | Average |
| C | 73 – 76% | 2.0 | Satisfactory |
| C- | 70 – 72% | 1.7 | Below Average |
| D+ | 67 – 69% | 1.3 | Poor |
| D | 60 – 66% | 1.0 | Very Poor |
| F | Below 60% | 0.0 | Failing |
How to Convert a Percentage to a Letter Grade
Converting a percentage to a letter grade is a straightforward process. Here is how to do it in three simple steps:
Step 1: Calculate Your Percentage Score
If you have a raw score (e.g., 42 out of 50), first convert it to a percentage using this formula:
| Percentage = (Score Earned ÷ Total Possible Score) × 100 |
Example: 42 ÷ 50 × 100 = 84% — that is a B on the standard scale.
Step 2: Check Your School’s Grading Scale
Before looking up your letter grade, confirm which grading scale your school uses. Most US schools use the standard scale (93% = A), but some use a more lenient scale (90% = A) or a stricter one (95% = A). Your syllabus or student handbook will specify which scale applies.
Step 3: Match Your Percentage to the Letter Grade
Using the table above or your school’s specific scale, find the range your percentage falls into. That is your letter grade. Simple as that.
| Pro Tip: Use our free grade calculator tool to instantly convert any score to a letter grade and see exactly how it affects your overall course grade and GPA — no manual calculation needed. |
Real Examples: Converting Scores to Letter Grades
Here are some common score examples converted to letter grades and GPA points using the standard US grading scale:
| Raw Score | Percentage | Letter Grade | GPA Points |
| 85 / 100 | 85% | B | 3.0 |
| 92 / 100 | 92% | A- | 3.7 |
| 73 / 100 | 73% | C | 2.0 |
| 67 / 100 | 67% | D+ | 1.3 |
| 54 / 100 | 54% | F | 0.0 |
| 78 / 100 | 78% | C+ | 2.3 |
| 96 / 100 | 96% | A | 4.0 |
Why Do Grading Scales Differ Between Schools?
Not every school uses the same grading scale — and this is one of the most common sources of confusion for students and parents. Here is why scales vary and what the most common differences look like:
Standard Scale (Most Common)
Used by the majority of US high schools and colleges. An A requires 93% or above, and each letter grade spans a 7–10 percentage point range.
Lenient Scale
Some schools use a more forgiving scale where an A starts at 90%. This is common at schools that want to encourage students or in courses where content is particularly challenging.
Strict Scale
Some rigorous academic programs use a strict scale where an A requires 95% or above. This is common in medical schools, law schools, and highly competitive academic environments.
The bottom line: always check your syllabus at the start of every course to confirm which grading scale your teacher or professor uses. Do not assume the standard scale applies everywhere.
How Letter Grades Affect Your GPA
Every letter grade you earn translates directly into GPA points, which are then used to calculate your overall Grade Point Average. This is why a single letter grade difference — say a B instead of a B+ — can have a meaningful impact on your GPA over time.
Here is what that looks like in practice: if you earn a B (3.0) instead of a B+ (3.3) in a 3-credit course, you lose 0.9 quality points for that course alone. Across a full semester of 5 courses, those small differences add up to a noticeable GPA change.
This is exactly why borderline grades matter so much — and why it is worth pushing for extra credit or a grade review when you are close to the next letter grade boundary. If you are aiming for a specific GPA for college admissions, understanding how your letter grades convert is essential.
| Remember: knowing your letter grade is just the first step. Use our final exam grade calculator to find out exactly what score you need to push your grade to the next letter — before your final exam. |
Tips for Improving Your Letter Grades
- Always check your syllabus grading scale at the start of the semester — do not assume
- Track your percentage score in each category, not just the letter grade
- Identify which assignments are closest to the next grade boundary and focus extra effort there
- Ask your professor if grade rounding applies — a 79.5% might round up to an 80% (B-)
- Submit every assignment — even a low score keeps you in a higher grade range than a zero
- Use a grade calculator weekly to see your current letter grade in real time
Frequently Asked Questions
Q: Is a 70% a passing grade?
A: In most US schools, 70% is considered a passing grade — it typically earns a C- on the standard scale. However, some programs and scholarships require a minimum of 75% or 80% to be considered satisfactory. Always check your specific requirements.
Q: What percentage is an A in college?
A: In most colleges using the standard scale, an A requires 93% or above. An A- is typically 90–92%. However, some professors use a 90% cutoff for an A, so always check the syllabus.
Q: Does a D count as passing?
A: A D (60–69%) is technically a passing grade in most high schools and colleges. However, many degree programs require a C or better in core courses — so a D may mean you need to retake the class even if you technically passed.
Q: How do I convert my percentage to a GPA?
A: First convert your percentage to a letter grade using the scale above, then use the corresponding GPA points. For example, 85% = B = 3.0 GPA points. Use our grade calculator tool to do this automatically for all your courses at once.
Q: What is the difference between an A and an A+?
A: Both an A and an A+ carry 4.0 GPA points on the standard unweighted scale, so they have the same GPA impact. The A+ (97–100%) simply indicates a higher level of achievement within the A range.
Final Thoughts
Converting a percentage to a letter grade does not have to be complicated. With the right grading scale and a clear understanding of how letter grades connect to your GPA, you can always know exactly where you stand academically.
Use the reference table in this guide whenever you need a quick conversion — and use our free grade calculator tool to instantly see how any score affects your overall course grade. The more you understand your grades, the better equipped you are to improve them.
| Convert any score to a letter grade instantly — use our free grade calculator tool and see your percentage, letter grade, and GPA impact all in one place! |