GPA 4.0 vs 4.3 vs 4.5 Scales

GPA scales are not globally uniform. While the 4.0 scale dominates North American higher education, South Korean universities predominantly use a 4.5 scale, with some older institutions still running on 4.3. Understanding how these scales relate to each other is essential for anyone applying to graduate programs, scholarships, or jobs that compare transcripts internationally.

How the Three Scales Work

On the 4.0 scale, the highest possible grade is an A or A+, both capped at 4.0. Each letter grade maps as follows: A = 4.0, B = 3.0, C = 2.0, D = 1.0, F = 0.

The 4.3 scale separates A (4.0) from A+ (4.3), giving extra credit for the top performance tier. It is used by some Korean universities and mirrors a system where distinction between an A and an exceptional A+ is explicitly rewarded.

The 4.5 scale, the most common in Korea today, extends the range further: A+ = 4.5, A = 4.0, B+ = 3.5, B = 3.0, and so on in 0.5 increments. This structure provides finer granularity across all grade bands.

Use Gpa Converter Kr to instantly convert between these three scales.

Conversion Formula

The standard approach to normalizing across scales uses proportional mapping:

Gpa Conversion Formula

For example, a 4.2 on the 4.5 scale converts to: (4.2 / 4.5) × 4.0 = 3.73 on the 4.0 scale. A 4.1 on the 4.3 scale converts to: (4.1 / 4.3) × 4.0 = 3.81 on the 4.0 scale.

Why Scale Choice Matters for Applications

When Korean students apply to US graduate programs, admissions offices expect a 4.0-equivalent GPA. Submitting a raw 4.2 on a 4.5 scale without conversion can mislead reviewers who assume a 4.0 maximum — they may incorrectly believe the applicant achieved a 4.2/4.0, which is mathematically impossible. Always convert explicitly and note the original scale.

Conversely, Korean companies evaluating overseas applicants' 3.8/4.0 GPAs should recognise that this is near-perfect performance — equivalent to roughly 4.27 on a 4.5 scale.

Weighted GPA and Plus/Minus Variants

Some institutions add a plus/minus system to the 4.0 scale: A+ = 4.0, A = 4.0, A− = 3.7, B+ = 3.3, B = 3.0, B− = 2.7, and so on. This is common at competitive US universities. The weighted average across all courses follows:

Weighted Average Formula

Practical Guidance

If you are a Korean student applying abroad, always report your GPA in two formats: the original (e.g., 4.1/4.5) and the converted 4.0 equivalent (3.64). This removes ambiguity and demonstrates awareness of international standards. Use Gpa Converter Kr for accurate, instant conversions across all three scales.