Is a 90% always an A?

On the standard 10-point scale, yes—90–100% is an A range. However, some schools use a 7-point scale where 93%+ is required for an A. Always check your school's specific scale.

What is a passing grade?

Most schools consider 60% (D−) the minimum passing grade. However, many programs require a C (73%) or higher for major-specific courses. Graduate programs often require a B (83%) or higher.

How does this affect my GPA?

Each letter grade maps to grade points: A=4.0, B=3.0, C=2.0, D=1.0, F=0.0. Plus/minus modifiers add or subtract 0.3. These grade points are used to calculate your GPA.

What if I got over 100%?

Scores above 100% (due to extra credit) still map to A+. However, the extra points above 100 don't add additional GPA benefit on the standard 4.0 scale.

Do plus and minus grades matter?

Yes. The difference between a B+ (3.3) and a B− (2.7) is 0.6 grade points per credit hour. Over a full semester, that can significantly impact your GPA.

What grading scale does my school use?

Check your school's academic catalog or your course syllabus. The most common scales in the US are the 10-point scale (A=90+) and the 7-point scale (A=93+).

Number to Letter Grade Converter

Convert a percentage score to a letter grade using standard or custom grading scales. Review the matching letter grade, GPA points, and grade description.

Percentage Score

Letter Grade

B+

GPA Points

3.3

on 4.0 scale

Points to Next Grade

10.0%

to reach A+

Percentage	Letter	GPA
97%+	A+	4.0
93%+	A	4.0
90%+	A-	3.7
87%+	B+	3.3
83%+	B	3.0
80%+	B-	2.7
77%+	C+	2.3
73%+	C	2.0
70%+	C-	1.7
67%+	D+	1.3
63%+	D	1.0
60%+	D-	0.7
0%+	F	0.0

Planning notes, formulas, and examples

About the Number to Letter Grade Converter

You just got an 87% on a test. But what letter grade is that? The answer depends on your school's grading scale. Most US schools use a standard 10-point scale where 90–100% is an A, 80–89% is a B, and so on. However, many schools use a 7-point scale, and some use custom thresholds.

This number-to-letter grade converter takes your percentage score and maps it to the appropriate letter grade on the standard US grading scale. It also shows the corresponding GPA points so you can immediately understand the impact on your GPA.

Whether you're a student checking your grade after a test, a parent interpreting a report card, or a teacher verifying grade assignments, this converter gives you a clear translation from numbers to letters without having to check a separate grading chart.

When This Page Helps

Different schools, districts, and even individual teachers may use slightly different grading scales. By converting your numeric score to a letter grade, you can quickly compare your performance against standard academic expectations. This is especially useful when transferring between schools or applying to colleges that need standardized grade information.

How to Use the Inputs

Enter your percentage score (0–100 or higher for extra credit).
The calculator maps it to the corresponding letter grade on the standard scale.
Review the letter grade, GPA equivalent, and grade description.
Optionally adjust the grading scale thresholds to match your school's system.
Use the full conversion table as a quick reference.

Formula used

Standard 10-Point Scale:
  A+ = 97–100%,  A = 93–96%,  A− = 90–92%
  B+ = 87–89%,   B = 83–86%,  B− = 80–82%
  C+ = 77–79%,   C = 73–76%,  C− = 70–72%
  D+ = 67–69%,   D = 63–66%,  D− = 60–62%
  F = 0–59%

Example Calculation

Result: B+

An 87% falls in the B+ range (87–89%) on the standard grading scale. This corresponds to 3.3 grade points on the 4.0 GPA scale. To reach an A− (90%), the student would need 3 more percentage points.

Tips & Best Practices

The standard scale uses 10-point intervals (90, 80, 70, 60) as boundaries. Some schools use 7-point intervals (93, 85, 78, 70).
Borderline scores (89%, 79%, etc.) are worth discussing with your teacher—rounding policies matter.
Keep this table bookmarked for quick reference throughout the semester.
If your school uses a non-standard scale, note the differences early in the semester.
Some AP and IB courses use different grading scales internally, but report on the standard letter scale.

Common Grading Scales in the United States

The two most common grading scales are the 10-point scale (A = 90–100%) and the 7-point scale (A = 93–100%). The 10-point scale is more generous and widely used in public schools. The 7-point scale is common in competitive high schools and many colleges, where it takes a higher percentage to earn each letter grade.

Grade Inflation and Deflation

Grade inflation refers to the trend of awarding higher grades for the same quality of work over time. Many colleges have seen average GPAs rise from 2.5 in the 1960s to over 3.3 today. Understanding your school's grading culture helps contextualize your percentage scores.

International Percentage Scales

Other countries use different percentage scales. In the UK, 70%+ is a First Class Honours (equivalent to an A). In Germany, 90%+ is a 1.0 (excellent). In India, 60%+ is a First Class. When converting international grades, use institution-specific equivalency tables rather than simple percentage mapping.

Sources & Methodology

Last updated: February 8, 2026

Frequently Asked Questions

On the standard 10-point scale, yes—90–100% is an A range. However, some schools use a 7-point scale where 93%+ is required for an A. Always check your school's specific scale.