South Korea GPA Conversion: 4.5 and 4.3 Scales to US GPA Explained

Quick Answer

Most Korean universities use a 4.5-point GPA scale, while some institutions — notably KAIST (Korea Advanced Institute of Science and Technology) and a few private universities — use a 4.3-point scale. The standard grading system uses letter grades with plus (+) and zero (0) sub-levels, such as A+, A0, B+, B0, C+, C0, D+, D0, and F.

On the 4.5 scale, A+ = 4.5, A0 = 4.0, B+ = 3.5, and B0 = 3.0. On the 4.3 scale, A+ = 4.3, A0 = 4.0, B+ = 3.3, and B0 = 3.0. The 4.3 scale is sometimes described as “4.3 version of the 4.5 scale” because the relative ranking of the letter grades remains the same, but the numeric values assigned to each grade differ.

Relative grading (grading on a curve) is the norm at most Korean universities, meaning grades are assigned based on a student’s performance relative to their classmates rather than against an absolute standard. Many universities limit the percentage of students who can receive A grades (typically top 30–40%) and B grades (next 30–35%). This system, rooted in the 1995 education reforms, aims to maintain academic standards and distinguish performance levels but has been criticized for creating intense competition among students.

There is no official South Korea-to-US GPA conversion table published by any government body — US universities and credential evaluators like WES convert grades individually. Simple proportional conversion (multiplying by 4.0/4.5) is not recommended because it fails to account for grading culture differences and the relative grading system used in Korea.

South Korean Grading Scale at a Glance

Understanding the 4.5 GPA Scale

The 4.5-point GPA scale is the most widely used grading system in South Korean universities. Most public and private universities — including Seoul National University, Korea University, Yonsei University, Hanyang University, and Konkuk University — use this scale.

On the 4.5 scale, letter grades are assigned grade point values as follows:

Source: Hanyang University, Konkuk University, Korea University grading scales. Percentage ranges may vary slightly by institution — always check your official transcript for the specific scale used at your university.

D0 is typically the minimum passing grade (1.0). F is failing (0.0) and earns no credit. A failed subject is excluded from earned credits.

Understanding the 4.3 GPA Scale

Some institutions use a 4.3-point GPA scale. The most notable user is KAIST (Korea Advanced Institute of Science and Technology), though a few private universities also use this scale.

On the 4.3 scale, grade point values are:

Source: KAIST grading scale (Grade | GPA table).

Note that the 4.3 scale is sometimes described as a “4.3 version of the 4.5 scale” because the relative ranking of the letter grades remains the same — A+ is still the highest, followed by A0, B+, B0, etc. — but the numeric values assigned to each grade differ. Some universities use both “A0” and “Ao” notation interchangeably.

In 2024, Jeju National University (JNU) transitioned from a 4.3 scale to a 4.5 scale, illustrating that some institutions are making the shift to align with the more common 4.5 system.

Relative Grading: The Korean Norm

A distinctive feature of the Korean grading system is relative grading (grading on a curve), where students are evaluated based on their performance relative to their classmates rather than against an absolute standard. At many Korean universities, the following grade distribution is common:

This system has its roots in the 1995 education reforms and aims to maintain academic standards and distinguish performance levels. However, it has been criticized for creating intense competition among students and sometimes discouraging collaboration.

Some universities allow absolute grading for certain courses, such as practical training courses, in accordance with university regulations if specific criteria are met.

The relative grading system has important implications for US GPA conversion:

• A Korean GPA of 3.5/4.5 may represent a different level of performance than a US GPA of 3.5/4.0 because of the curve
• A grade of A0 in Korea (90–94%) might be equivalent to a US A- (3.7) rather than a straight A (4.0) due to the relative grading context
• WES and other evaluators adjust Korean GPAs based on the grading system and institutional standards

South Korea Grade Lookup Tool

This tool shows your grade’s Korean descriptor and an approximate US GPA equivalent based on commonly accepted conversion standards. It does not generate an official GPA — see the sections below on why that number can’t be produced by a simple formula, and how to get an official conversion.

Why There’s No Single “Correct” US GPA Number

1. Two Different GPA Scales Are Used

South Korea uses both 4.5 and 4.3 scales, depending on the institution. Some universities (like KAIST) use a 4.3 scale while the majority use 4.5. This means a grade of “A+” at one university is worth 4.5 GPA points while at another it’s worth 4.3 GPA points.

2. Relative Grading Distorts Simple Comparison

The relative grading system used at most Korean universities means that grades are assigned based on performance relative to classmates, not against an absolute standard. A student with 85% in a class where everyone scored high might receive a B+, while a student with 80% in a class with lower scores might receive an A. This makes direct percentage-to-GPA conversion unreliable.

3. No Official Korea-to-US Conversion Authority

There is no official South Korea-to-US GPA formula published by the Korean government (MOE), the US Department of Education, or any bilateral agreement. The Korean Ministry of Education provides guidelines for domestic grading but does not provide conversion to foreign systems.

4. Simple Proportional Conversion Is Not Recommended

A common mistake is trying to convert a Korean GPA to a US 4.0 scale using a simple formula like GPA₄.₀ = (Korean GPA ÷ 4.5) × 4.0. This approach does not account for the relative grading system or the different grading cultures. A 3.9/4.5 GPA might seem like a 3.47/4.0 using this formula, but actual WES evaluations often produce different results.

Real US Conversion Examples

Different sources publish conversion charts for Korean grades. Here are two examples — planning references only, not universal standards:

Example 1: Korean 4.5 Scale to US GPA (Common Reference)

Source: Based on common US admissions practice and WES reference tables. This chart applies as a planning reference only — your target university’s admissions office may use a different scale entirely.

Example 2: Korean 4.3 Scale (KAIST) to US GPA

Source: KAIST grading scale and common US admissions practice.

Example 3: GKS Scholarship Official Conversion Table

The Global Korea Scholarship (GKS) program publishes an official conversion table for converting between different GPA scales:

Source: GKS Official GPA Conversion Table. This table is used specifically for GKS scholarship applications and does not represent a universal conversion standard.

How WES Converts South Korean Grades

Most US universities, scholarship programs, and immigration processes that require a numeric GPA from a Korean transcript point applicants to a NACES-accredited credential evaluation service, most commonly World Education Services (WES). WES evaluates Korean credentials by converting each grade individually and weighting the results by credit hours to produce a final GPA.

Key point: WES does not simply copy your university GPA. They re-evaluate based on academic rigor, grading scale, and institutional standards. The relative grading system used in Korea is a significant factor in how WES interprets Korean grades.

How to Report Your Korean GPA on US Applications

1. Report Your Original Grades First

Don’t self-convert to a 4.0 scale unless the application specifically asks for a US-equivalent GPA. Report your grades exactly as they appear on your transcript — including the grading scale used (4.5 or 4.3) and the letter grades (A+, A0, B+, etc.).

2. Include Your Grading Scale Explanation

Korean transcripts often include the grading scale key on the academic record. Include this key or the official grading scale explanation wherever the application allows supporting documents. Clearly indicate which scale your institution uses (4.5 or 4.3) and note that relative grading is the norm.

3. Get a Formal Evaluation If Required

Many US graduate programs and scholarships — including some competitive, merit-based ones — require a WES or equivalent NACES-member evaluation rather than a self-reported conversion. Submit sealed official transcripts and include grading scale documentation.

4. Don’t Round Up

If your evaluated GPA falls in a range, report the figure your evaluator actually gives you — not the top of the band.

Frequently Asked Questions

Christian Chinonso

Christian Chinonso is the founder of LearnViaHub, with 6+ years of research experience in international education, GPA systems, and study-abroad guidance for international students.Christian Chinonso is the founder of LearnViaHub, with 6+ years of research experience in international education — including GPA systems, scholarships, student financing, and study-abroad guidance — for students worldwide.