Korean GPA Conversion: 4.5 to 4.0 and Back

Korean universities use three different GPA scales — 4.5, 4.3, and 4.0 — and the absence of a single standard creates constant confusion for students applying to graduate schools, public sector jobs, and professional certifications. Understanding how these scales work, how to convert between them, and how to present your GPA accurately is a practical skill every Korean university graduate needs.

Gpa Converter Kr

Why Three Different Scales Exist in Korea

Korean universities did not coordinate on a single GPA scale when modern higher education expanded in the 1970s and 1980s. Each institution set its own. Over time, conventions formed around three main systems:

• 4.5 scale: The most common in Korean universities. Grades of A+, A0, B+, B0, C+, C0, D+, D0, F map to 4.5, 4.0, 3.5, 3.0, 2.5, 2.0, 1.5, 1.0, 0.0.
• 4.3 scale: Used by some older universities. A+ = 4.3, A = 4.0, B+ = 3.3, B = 3.0, etc.
• 4.0 scale: Less common, but used by some programs and increasingly adopted for graduate studies and international comparisons. A = 4.0, B = 3.0, C = 2.0, D = 1.0, F = 0.0.

Some universities also use letter grades without plus/minus distinctions, further complicating direct comparison.

The Core Conversion Formula

Gpa Conversion Formula

The principle behind all GPA conversions is proportional scaling: identify where your GPA sits as a fraction of the maximum possible, then apply that fraction to the target scale's maximum.

For the 4.5 to 4.0 conversion: GPA₄.₀ = (GPA₄.₅ / 4.5) × 4.0

For example, a 4.0 / 4.5 GPA converts to: (4.0 / 4.5) × 4.0 = 3.56 / 4.0.

For the 4.3 to 4.0 conversion: GPA₄.₀ = (GPA₄.₃ / 4.3) × 4.0

A 3.9 / 4.3 GPA converts to: (3.9 / 4.3) × 4.0 = 3.63 / 4.0.

Use our Gpa Converter Kr to perform these calculations precisely without rounding errors.

Common Conversion Table

The most frequently referenced conversions from 4.5 to 4.0:

4.5 Scale	4.3 Scale	4.0 Scale	Approximate Letter
4.5	4.3	4.0	A+
4.2	4.0	3.73	A
3.8	3.7	3.38	A−
3.5	3.3	3.11	B+
3.0	3.0	2.67	B
2.5	2.7	2.22	B−
2.0	2.3	1.78	C

Note that these conversions are approximations. For official purposes — job applications, graduate school submissions — always use the exact formula and carry at least two decimal places.

When Conversion Actually Matters

Public sector job applications (공무원 / 공기업): Most public corporations and government-affiliated organizations use a standardized GPA comparison in their initial screening. If the application form asks for GPA "on a 4.5 scale," you should convert your 4.0 or 4.3 GPA using the formula above, not just report your native score. Reporting a 3.7/4.0 as "3.7" on a form asking for a 4.5-scale GPA significantly understates your standing.

Graduate school applications within Korea: Korean graduate schools often specify which scale they use for comparison. KAIST and POSTECH primarily use 4.3. Seoul National University uses a letter system with its own conversion. Check the specific requirements of each program.

Double-degree or exchange programs: Partner universities abroad may calculate eligibility minimums based on your GPA. A 3.3/4.5 GPA is equivalent to a 2.93/4.0 — above the common minimum of 2.5 but below selective thresholds of 3.0+.

Weighted vs Unweighted GPA

Korean universities calculate GPA as a credit-weighted average — a course worth 3 credits contributes three times as much to your GPA as a course worth 1 credit. This is the global standard:

Weighted Average Formula

If you completed a 3-credit course with an A+ (4.5) and a 2-credit course with a C (2.0), your GPA for those courses is: ((3 × 4.5) + (2 × 2.0)) / (3 + 2) = (13.5 + 4.0) / 5 = 3.5.

Most Korean university transcripts show your cumulative weighted GPA automatically. If you need to verify or recalculate it, our Gpa Converter Kr handles the weighted calculation.

Practical Advice for Job Applications

When applying to positions that use a GPA filter, always present your GPA on the scale the employer specifies. If the employer uses a 4.5 scale and your university uses 4.3, convert and state both: "3.9/4.3 (equivalent to 3.63/4.0, or 4.07/4.5)." Transparency about the original scale and the conversion method builds more credibility than reporting a single converted number without context.

Finally, GPA matters less in Korean hiring than many students believe. Major corporations (Samsung, Hyundai, LG) screen by GPA minimum cutoffs — typically 3.0/4.5 — but do not rank within the qualified pool by GPA. Once you clear the threshold, your internship experience, language scores (TOEIC, OPIc), and group interviews determine outcomes.