How to Convert the South Korean Grading System to a US GPA (2026)

A South Korean transcript usually shows a letter grade and a number that looks like a familiar US-style GPA already, something like "3.8" or "4.1." That resemblance is misleading. The underlying scale isn't standardized nationally, and converting a Korean GPA correctly means first figuring out which of several different scales your own university actually used, something a lot of self-reported conversions get wrong by assuming a single universal system.

There is no single national Korean GPA scale

Unlike countries that mandate one grading scale across all universities, South Korea leaves the scale itself up to each individual institution. Sources checked for this guide consistently describe three main options in active use: a 4.5-point scale, a 4.3-point scale, and a 4.0-point scale, with 4.5 and 4.3 the most commonly cited across Korean universities. A smaller number of schools use 4.0, which happens to already match the common US scale numerically, even though the underlying letter-grade mapping can still differ.

Practically, that means the same transcript entry, "A+," can represent 4.5 points at one university and 4.3 points at another. Before you convert anything, confirm which scale your own institution's grading key actually uses. Most Korean universities print this on the transcript itself or in an accompanying grading-key document, and it's worth tracking down rather than guessing.

The common letter-grade and percentage bands

Across the calculator sites and guides reviewed, a fairly consistent percentage-band pattern shows up for how Korean universities assign letter grades: roughly 95 to 100 percent for A+, 90 to 94 for A0, 85 to 89 for B+, 80 to 84 for B0, 75 to 79 for C+, 70 to 74 for C0, 65 to 69 for D+, 60 to 64 for D0, and below 60 generally treated as a fail. On the letter-point side, one widely cited mapping treats A+ as the scale's maximum (4.5, 4.3, or 4.0 depending on which scale is in use), A0 one full point below that, and so on down through B, C, D, and F in half-point steps.

A separate commercial converter instead lists a 4.3-scale mapping where A+ sits at 4.3 and B+ at 3.5, slightly different spacing from the straightforward half-point pattern. The two approaches broadly agree on the order of grades but not always on the exact point value for every letter, which is itself a signal that no single authoritative national table exists publicly. Treat the percentage bands as commonly reported, and treat the exact point value for any one letter grade as something to confirm against your own university's documentation rather than a generic table, including this one.

Where US conversions genuinely disagree

This is the part that actually matters if you're applying to a US program and need to present an equivalent GPA. The sources checked for this guide do not agree on how to map a Korean grade onto the US 4.0 scale, and the disagreement isn't trivial.

One approach treats both A+ and A0 as equivalent to a US 4.0, collapsing the top two Korean grades into the single highest US value. A second approach, closer to the methodology credential evaluators like WES typically describe for letter-grade systems, maps A0 down to roughly 3.7 rather than a full 4.0, reserving 4.0 for A+ alone, the same way a US A- sits below a US A. A third, purely proportional approach scales a 4.5-point Korean GPA down linearly, so a 4.0 out of 4.5 becomes approximately 3.73 out of 4.0, a different number again from either of the letter-based approaches.

These three methods can produce meaningfully different results from the same transcript. A student with a 4.0/4.5 Korean GPA might see that reported as a 4.0, a 3.7, or a 3.73 depending entirely on which conversion logic was applied, not on anything about their actual academic performance. None of the public sources checked settle definitively on one method as the single correct answer, though the letter-based, WES-style approach is the one most often associated with formal credential evaluations rather than proportional scaling.

What a formal evaluation actually requires

If a program's application instructions specifically require a credential evaluation rather than a self-reported GPA, the right move is to use a NACES-member evaluator, most commonly WES or ECE, and let their documented methodology produce the number, rather than presenting your own calculation as equivalent. Our WES vs. ECE vs. IQAS guide covers how these evaluators differ and which one specific destinations and program types typically expect. If the program only asks you to self-report, state your raw grade and scale exactly as it appears on your transcript ("3.8/4.5" or "A0, 90-94% band") rather than converting it into a single US-style number yourself and presenting that as the authoritative figure. A specific, sourced number invites less skepticism than a bare self-converted GPA that a reader can't verify.

Many Korean universities grade on a forced curve, which changes what a grade actually means

There's a structural factor behind Korean grades that a bare conversion table can't capture: a meaningful number of Korean universities apply relative grading, a mandatory distribution quota that caps how many students in a given course can receive the top grade, rather than letting every student who clears a fixed bar earn an A. A commercial credential-evaluation site describes this cap as commonly limiting A grades to roughly 30 percent of a course's enrolled students, though that specific figure comes from a single source aimed at foreign evaluators and couldn't be independently corroborated for this guide, so treat the exact number as reported rather than confirmed.

The broader pattern is easier to confirm. A 2010 Korea Times report on grade inflation found that nearly 36 percent of that year's Korean university graduates had graduated with an A-range GPA average, and roughly 56 percent landed in the B range, a distribution the article explicitly framed as evidence of grade inflation under grading practices that were, at the time, often not curved. The same report noted that Yonsei University had just announced it would move its senior-year courses onto a relative grading system specifically in response to that inflation. That history matters for interpreting a transcript today: a university or specific course graded on a strict relative curve produces a structurally different GPA distribution than one graded on an absolute scale, even among equally capable students, and a bare GPA number doesn't tell you which kind of grading produced it.

Practically, this means two Korean applicants with the same numeric GPA may have cleared genuinely different bars depending on whether their specific university, or even their specific course, used relative or absolute grading. If you know your own program used a mandatory curve, it's worth mentioning that context directly in a cold email or application rather than assuming the number speaks for itself.

A worked example of the disagreement

Take a transcript showing an overall GPA of 4.0 on a 4.5 scale, a genuinely strong result corresponding roughly to an A0 average. Reported three different ways: the collapsed-top-grade method gives 4.0. The WES-style letter mapping gives roughly 3.7. The straight proportional scaling gives roughly 3.73. All three numbers describe the same underlying transcript, and none of them is simply wrong, they reflect different conversion philosophies. That's precisely why leading with your own self-converted number as a settled fact is risky: a reader applying a different method could reasonably arrive at a different figure from the same raw data.

What to actually put in a cold email or application

If you're reaching out to a potential advisor rather than submitting a formal application, skip the conversion question entirely and just state the real number with context: "GPA of 4.1/4.5 (top of my cohort)" tells a reader something concrete. A bare "3.6 GPA" invites the same unanswerable question this whole guide has been describing, which formula did you use. Our guide to finding a funded masters in South Korea and our guide to finding a PhD supervisor in South Korea cover how Korean professor-funded outreach actually works if you're applying in the other direction, into Korea rather than out of it.

Confirm specifics before you rely on them

The existence of multiple Korean GPA scales (4.5, 4.3, and 4.0), and the general shape of the percentage bands, are consistently reported across the sources checked for this guide. The exact point value a given letter grade carries, and which US conversion method a specific evaluator or program actually applies, are genuinely unsettled questions where sources disagree. Confirm the scale directly against your own institution's grading key, and confirm the conversion method against the specific evaluator or program you're dealing with, rather than relying on a single generic table, including this one.

Finding the funded path once your transcript is sorted

A correctly explained GPA helps an application land the way it should, it doesn't replace the funding search itself. GradScoutFunding searches professors by field and country, confirms they're actively publishing, and drafts a personalized first email grounded in their real recent paper for you to review and send yourself, it never sends anything automatically. The free tier gives you 2 credits with no card required, and paid credit packs are one-time purchases that never expire.

Common questions