South Korean universities grade on a letter-grade system running from A+ down to F, but unlike the US the maximum GPA scale isn't fixed at 4.0 — most Korean schools use either a 4.3 or 4.5 scale, with the exact letter-to-point mapping set independently by each institution rather than by a national standard.
How the Korean letter-grade system works
Korean university transcripts use familiar-looking letter grades — A+, A0, A-, B+, B0, B-, C+, C0, C-, D+, D0, D-, and F — but the point value attached to each letter depends on which scale the university has adopted. The two most common patterns look like this:
| Letter grade | 4.3-scale points | 4.5-scale points |
|---|---|---|
| A+ | 4.3 | 4.5 |
| A0 | 4.0 | 4.0 |
| A- | 3.7 | 3.5 |
| B+ | 3.3 | 3.5 |
| B0 | 3.0 | 3.0 |
| B- | 2.7 | 2.5 |
| C+ | 2.3 | 2.5 |
| C0 | 2.0 | 2.0 |
| D+ | 1.3 | 1.5 |
| D0 | 1.0 | 1.0 |
| F | 0.0 | 0.0 |
Notice the "0" suffix (A0, B0, C0, D0) used instead of a bare letter — this is a distinctly Korean convention marking the "flat," non-plus/non-minus version of each grade, roughly equivalent to a plain A, B, C, or D in the US system.
There is no single national GPA maximum in South Korea. Seoul National University, Yonsei University, and Ewha Womans University are commonly cited examples of schools using a 4.3-scale, while many other Korean universities use 4.5 instead. A 4.0 GPA at one Korean university is not automatically equivalent to a 4.0 at another — always confirm which scale a specific transcript is using before comparing numbers.
Why the scale maximum matters for comparison
Because the ceiling differs, the same academic performance can produce different-looking GPA numbers depending on which scale a school uses. A student who earns straight A0s would show a 4.0 GPA at either type of school, but a student earning mostly A+ grades would show closer to 4.3 at one university and 4.5 at another — even though both represent the top grade available at their respective school.
This is also why simply multiplying a Korean GPA by a conversion ratio (like 4.0 ÷ 4.3) tends to produce a rough, sometimes misleading estimate — it doesn't account for how individual grade bands are actually distributed, and it can understate or overstate the equivalent US GPA depending on how many A+ or D+ grades sit in the transcript.
Converting a Korean GPA to a US 4.0 GPA
There is no single official Korea-to-US GPA conversion formula, and both WES and individual US universities generally recommend converting grade by grade rather than rescaling the final number. A commonly used general mapping, based on the letter grade itself rather than the raw point value, looks like this:
| Korean letter grade | Approximate US letter | Approximate US GPA points |
|---|---|---|
| A+ | A | 4.0 |
| A0 | A | 4.0 |
| A- | A- | 3.7 |
| B+ | B+ | 3.3 |
| B0 | B | 3.0 |
| B- | B- | 2.7 |
| C+ | C+ | 2.3 |
| C0 | C | 2.0 |
| D+ | D+ | 1.3 |
| D0 | D | 1.0 |
| F | F | 0.0 |
Worked example: A student's transcript from a Korean university (4.3-scale) lists the following course results:
| Course | Credit hours | Korean grade | Approx. US GPA points |
|---|---|---|---|
| 미시경제학 (Microeconomics) | 3 | A0 | 4.0 |
| 선형대수학 (Linear Algebra) | 3 | B+ | 3.3 |
| 한국사 (Korean History) | 2 | A+ | 4.0 |
| 경영통계학 (Business Statistics) | 3 | C+ | 2.3 |
Weighted GPA = ((4.0×3) + (3.3×3) + (4.0×2) + (2.3×3)) ÷ 11 = (12.0 + 9.9 + 8.0 + 6.9) ÷ 11 = 36.8 ÷ 11 ≈ 3.35
Notice that both A0 and A+ convert to the same 4.0 on the US scale in this letter-based approach, even though A+ carried more points (4.3) on the original Korean transcript — this is exactly why grade-by-grade conversion, rather than rescaling the raw GPA number, is the more common approach recommended by credential evaluators. Once each grade is mapped, you can use a GPA Calculator or Letter Grade to GPA Conversion Chart reference to check the arithmetic.
If you're submitting a Korean transcript for a US graduate program, scholarship, or job application, check whether the receiving institution or a credential evaluator like WES has a published Korea-specific conversion table before relying on a generic self-calculated GPA — and always note whether the original transcript used a 4.3 or 4.5 scale, since that context can matter even after conversion.
How South Korea compares to other Asian systems
South Korea's letter-grade approach differs from neighboring systems like China's percentage-based grading and Japan's grading conventions, both of which lean more on numeric or percentage scores than US-style letters. For a broader side-by-side view, see our international grading systems comparison.
Key takeaways
- South Korean universities use A+ through F letter grades, but the maximum GPA scale is either 4.3 or 4.5 depending on the school — there's no single national standard.
- The "0" suffix (A0, B0, C0, D0) marks the flat, non-plus/non-minus version of a grade — roughly equivalent to a plain letter grade in the US.
- Because the scale maximum varies, a raw GPA number from one Korean university isn't automatically comparable to another's without knowing which scale was used.
- Grade-by-grade conversion, rather than simply rescaling the final GPA number, is the recommended and more accurate way to estimate a US 4.0 equivalent.
