US Grading Scale Explained — What Do A B C D and F Mean?

The US grading scale is one of the first things students and teachers need to understand. Whether you are new to the American education system or just need a clear reference for every letter grade and its exact percentage range, this guide covers everything in one place.

What is the US Grading Scale?

The US grading scale is an alphabetical grading system used across American schools, colleges and universities to measure student academic performance. It converts percentage scores into letter grades from A to F.

Each letter grade represents a range of percentage scores. Teachers use this scale to grade tests, quizzes, assignments and final exams consistently across all subjects.

You can calculate your exact percentage score for any test instantly using Easy Grader Calc — just enter total questions and wrong answers to get your letter grade in seconds.

Complete US Grading Scale — Every Letter Grade With Percentages

Here is the full US grading scale with percentage ranges, GPA values and what each grade means:

This is the standard American grading system used by most schools and universities across the United States. Some institutions may adjust the cutoffs slightly so always check your school’s specific grading policy.

What Does Each Letter Grade Mean?

What Does an A Mean in Grades?

An A grade means the student scored between 90% and 100%. It represents excellent academic performance. An A is what most students aim for. What is considered an A in high school is the same as in college — 90% or above.

What Does a B Mean in Grades?

A B grade means the student scored between 80% and 89%. It represents good performance. Many students consider a B a strong and respectable grade. A B- grade percentage sits between 80% and 82%. An 82% is a B- and an 83% is a B. Is an 88% an A or a B? It is a B+ since it falls between 87% and 89%.

What Does a C Mean in Grades?

A C grade means the student scored between 70% and 79%. It represents average performance. A C is generally a passing grade at most institutions. A 79% is a C+ not a B — it is one percentage point below a B-.

What Does a D Mean in Grades?

A D grade means the student scored between 60% and 69%. It represents below average performance. A D is technically a passing grade at many schools but may not meet requirements for specific courses or programs.

Here are the exact percentage ranges for D grades:

• What is a D+ grade percentage? — 67% to 69%
• What is a D grade percentage? — 63% to 66%
• What is a D- grade percentage? — 60% to 62%

What Does an F Mean in Grades?

An F grade means the student scored below 60%. It represents a failing grade. Is a 60% a D or F? A 60% is a D- on the standard US grading scale not an F. An F starts below 60%.

Most Common Grade Questions — Answered

Is a 79% a B? No. A 79% is a C+ on the standard US grading scale. A B grade starts at 80%.

Is an 82% a B? Yes. An 82% is a B- which falls in the B- range of 80% to 82%.

Is an 83% a B? Yes. An 83% is a B which falls in the B range of 83% to 86%.

Is a 60% a D or an F? A 60% is a D- on the standard US grading scale. An F only begins below 60%.

What is a B minus grade? A B minus is a letter grade that represents a percentage score between 80% and 82%. It earns 2.7 GPA points.

What percent is a B? A B grade is any score between 83% and 86%. A B+ is 87% to 89% and a B- is 80% to 82%.

What is a D grade percentage? A D grade covers 63% to 66%. A D+ is 67% to 69% and a D- is 60% to 62%.

What percentage is a D-? A D- is any score between 60% and 62% on the standard US grading scale.

Is 88% an A or a B? An 88% is a B+ on the standard US grading scale. An A grade starts at 90%.

How many points is an A? An A earns 4.0 GPA points. An A- earns 3.7 points and an A+ also earns 4.0 points.

The American Grading System vs Other Countries

The alphabetical grading system used in the US is unique to North America. Other countries use different systems:

The American grading system is built around letter grades tied to percentages and GPA points. It is designed to give students and teachers a clear consistent measure of academic performance across all subjects and grade levels.

For more on how GPA connects to letter grades read our complete guide on how to calculate GPA from letter grades.

How Teachers Use the US Grading Scale

Teachers apply the US grading scale every time they grade a test, quiz or assignment. The process works like this:

A student answers a 50-question test and gets 8 wrong. That means 42 correct answers out of 50 which equals 84%. According to the grading scale 84% is a B.

Doing this manually for 30 students takes significant time. Using a free online grade calculator generates the result instantly and produces a full grading chart showing the grade for every possible number of wrong answers automatically.

US Grading Scale for Specific Question Counts

Teachers often want to know what score equals what grade for their specific test. Here are some common examples using the standard US grading scale:

20-question test:

• 18 correct = 90% = A
• 16 correct = 80% = B
• 14 correct = 70% = C
• 12 correct = 60% = D
• Below 12 = F

30-question test:

• 27 correct = 90% = A
• 24 correct = 80% = B
• 21 correct = 70% = C
• 18 correct = 60% = D
• Below 18 = F

40-question test:

• 36 correct = 90% = A
• 32 correct = 80% = B
• 28 correct = 70% = C
• 24 correct = 60% = D
• Below 24 = F

For any question count from 1 to 500 you can generate a complete automatic grading chart using Easy Grader Calc free. No sign up needed.

What is Considered Passing in the US Grading System?

In most American schools a passing grade is a D or above which means 60% or higher. However passing requirements vary by institution and course type. Some programs require a C or higher to pass. Some colleges require a B in prerequisite courses for progression.

For a full explanation of passing grades read our guide on what is a passing grade and how it varies across different academic levels.

How to Calculate Your Grade Using the US Grading Scale

Knowing the grading scale is one thing. Calculating where your score lands is another. Here is the simple formula:

Percentage = (Correct Answers ÷ Total Questions) × 100

Then match your percentage to the grading scale table above to find your letter grade.

Or skip the math entirely. Use our free EZ grader tool — enter total questions and wrong answers and your percentage grade and letter grade appear instantly.

According to the National Center for Education Statistics{:target=”_blank” rel=”noopener”} the letter grade system remains the most widely used academic assessment method across American K-12 schools and higher education institutions.

Frequently Asked Questions

What is the US grading scale? The US grading scale is an alphabetical system using letter grades from A to F. Each letter represents a percentage range. A is 90 to 100 percent, B is 80 to 89 percent, C is 70 to 79 percent, D is 60 to 69 percent and F is below 60 percent.

What does a B mean in grades? A B grade means a score between 83% and 86%. A B+ is 87% to 89% and a B- is 80% to 82%. All represent good academic performance.

What is a D grade percentage? A D grade is any score between 60% and 69%. A D+ is 67% to 69%, a D is 63% to 66% and a D- is 60% to 62%.

Is a 60% a D or an F? A 60% is a D- on the standard US grading scale. An F grade only begins below 60%.

What does A B C D F stand for in grades? A stands for Excellent, B for Good, C for Average, D for Below Average and F for Failing. The letters E was historically skipped to avoid confusion with Excellent so F became the failing grade.

What is the alphabetical grading system? The alphabetical grading system is the A to F letter grade system used primarily in the United States. It converts percentage scores into letter grades with corresponding GPA values for academic tracking.

What is a B minus grade percentage? A B minus is a score between 80% and 82%. It earns 2.7 GPA points on the standard 4.0 scale.

Conclusion

The US grading scale is straightforward once you know the exact percentage ranges for each letter grade. A is 90 to 100, B is 80 to 89, C is 70 to 79, D is 60 to 69 and F is anything below 60. Every plus and minus grade fills in the gaps between those main letter grades.

Whether you are a student tracking your academic performance or a teacher applying the American grading system to tests and assignments, keeping this scale handy saves time and confusion.

Try Easy Grader Calc free — enter any test score and get your letter grade, GPA points and full grading chart in seconds. No sign up ever required.