Complete Grading Scale Guide
Understanding letter grades, percentages, GPA scales, and international grading systems
US Standard Grading Scale (A-F)
The most common grading system used in American schools and universities
| Letter Grade | Percentage Range | GPA (4.0 Scale) | Description |
|---|---|---|---|
| A | 90-100% | 4.0 | Excellent - Outstanding performance |
| B | 80-89% | 3.0 | Good - Above average performance |
| C | 70-79% | 2.0 | Satisfactory - Average performance |
| D | 60-69% | 1.0 | Passing - Below average but acceptable |
| F | 0-59% | 0.0 | Failing - Does not meet requirements |
Plus/Minus Grading Scale
More detailed grading with plus and minus variations
Many schools use plus and minus grades for finer distinctions between performance levels:
| Grade | Range | GPA 4.0 | GPA 5.0 |
|---|---|---|---|
| A+ | 97-100% | 4.0 | 5.0 |
| A | 93-96% | 4.0 | 4.7 |
| A- | 90-92% | 3.7 | 4.3 |
| B+ | 87-89% | 3.3 | 4.0 |
| B | 83-86% | 3.0 | 3.7 |
| B- | 80-82% | 2.7 | 3.3 |
| C+ | 77-79% | 2.3 | 3.0 |
| C | 73-76% | 2.0 | 2.7 |
| C- | 70-72% | 1.7 | 2.3 |
| D+ | 67-69% | 1.3 | 2.0 |
| D | 65-66% | 1.0 | 1.7 |
| D- | 60-64% | 0.7 | 1.3 |
| F | 0-59% | 0.0 | 0.0 |
GPA Scales Explained
Understanding 4.0 and 5.0 GPA scales
4.0 GPA Scale (Standard)
The most common GPA scale used by most high schools and colleges. A grade of 'A' equals 4.0, 'B' equals 3.0, and so on.
| Grade | GPA | % |
|---|---|---|
| A | 4.0 | 90-100% |
| B | 3.0 | 80-89% |
| C | 2.0 | 70-79% |
| D | 1.0 | 60-69% |
| F | 0.0 | 0-59% |
5.0 GPA Scale (Weighted)
Used for advanced classes like honors, AP, or IB courses. An 'A' in an advanced class is worth 5.0 instead of 4.0.
| Grade | GPA | % |
|---|---|---|
| A | 5.0 | 90-100% |
| B | 4.0 | 80-89% |
| C | 3.0 | 70-79% |
| D | 2.0 | 60-69% |
| F | 0.0 | 0-59% |
Note: Not all schools use weighted GPAs. Check with your school to understand their specific grading policy.
International Grading Systems
How grading works in other countries
United Kingdom Grading System
UK universities use a classification system for degrees:
| Classification | Abbrev | % | Description |
|---|---|---|---|
| First-Class Honours | First | 70%+ | Excellent |
| Upper Second-Class | 2:1 | 60-69% | Very Good |
| Lower Second-Class | 2:2 | 50-59% | Good |
| Third Class | Third | 40-49% | Pass |
| Fail | Fail | Below 40% | Does not pass |
Canadian Grading System
Canada uses letter grades similar to the US, but percentage ranges may vary by province:
| Grade | Range | Description |
|---|---|---|
| A | 80-100% | Excellent |
| B | 70-79% | Good |
| C | 60-69% | Satisfactory |
| D | 50-59% | Pass |
| F | 0-49% | Fail |
*Note: Some provinces use different scales. Ontario, for example, uses 90-100% for an A grade.*
Australian Grading System
Australian universities use letter abbreviations with descriptions:
| Grade | Name | Range | Description |
|---|---|---|---|
| HD | High Distinction | 85-100% | Outstanding |
| D | Distinction | 75-84% | Excellent |
| C | Credit | 65-74% | Good |
| P | Pass | 50-64% | Satisfactory |
| F | Fail | 0-49% | Does not meet standards |
Percentage to Letter Grade Conversion
Quick reference chart for converting percentages to letter grades
| Percentage | Letter Grade | GPA |
|---|---|---|
| 97-100% | A+ | 4.0 |
| 93-96% | A | 4.0 |
| 90-92% | A- | 3.7 |
| 87-89% | B+ | 3.3 |
| 83-86% | B | 3.0 |
| 80-82% | B- | 2.7 |
| 77-79% | C+ | 2.3 |
| 73-76% | C | 2.0 |
| 70-72% | C- | 1.7 |
| 67-69% | D+ | 1.3 |
| 65-66% | D | 1.0 |
| 60-64% | D- | 0.7 |
| 0-59% | F | 0.0 |
Frequently Asked Questions
What is a passing grade?
In most US schools, a passing grade is typically a D (60% or higher). However, many colleges and universities require a C (70% or higher) for courses that count toward your major. Some schools also have specific grading policies for prerequisite courses.
How is GPA calculated?
GPA is calculated by converting each letter grade to grade points (A=4, B=3, C=2, D=1, F=0), multiplying by the course credits, summing all grade points, and dividing by total credits attempted. Use our free GPA Calculator for instant calculations.
What is the difference between weighted and unweighted GPA?
Unweighted GPA uses a 4.0 scale where an A is always 4.0. Weighted GPA gives extra points (up to 5.0) for advanced classes like AP, IB, or honors courses. This rewards students for taking more challenging coursework.
Do grading scales vary by school?
Yes, grading scales can vary significantly between schools and districts. Some schools use 93-100% for an A, while others use 90-100%. Some use plus/minus grading, others don't. Always check your specific school's grading policy in the course syllabus or student handbook.
How do I convert international grades to US GPA?
International grade conversion varies by country and evaluation service. Generally, UK First Class (70%+) converts to a 4.0 GPA (A), Canadian A (80-100%) converts to 4.0, and Australian HD (85%+) converts to 4.0. Many universities use credential evaluation services like WES for official conversions.
What percentage is an A grade?
In most US schools, an A grade is 90-100%. Some schools use 93-100% for an A and 90-92% for an A-. Always verify with your teacher or syllabus as grading scales can vary between institutions.
What is the 10-point grading scale?
The 10-point grading scale is a common system where each letter grade covers a 10% range: A (90-100%), B (80-89%), C (70-79%), D (60-69%), and F (0-59%). This scale is straightforward and makes it easy to understand grade boundaries.
What grade is considered failing?
In most US schools, any grade below 60% (typically an F) is considered failing. However, some schools set the bar at 50% or use different scales. Failing grades usually don't earn credit and may need to be retaken for graduation requirements.
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