⚠️ The 표준점수 (standard score) formula is nationally standardized, but each subject's mean and SD are only published by KICE after the exam each year — you'll need to enter that year's published values yourself. The 9-grade cumulative percentage cutoffs are a fixed official system and are reliable.
University placement reference (grade bands)
Rough mapping summarized from past regular-admission (정시) outcomes, matched live against your grade above. Note: actual 정시 admission uses combined standard scores across subjects (Korean / Math / electives + English grade) — a single-subject grade is only a rough indicator; check each university's admission guide.
| Grade (등급) | University tier | Typical placement |
|---|
9-grade cumulative percentage reference (fixed official system)
| 등급 | Cumulative % ceiling |
|---|
- Interpreting CSAT (수능) results
- Gauging regular-admission (정시) grade requirements
- Understanding your relative standing among test-takers
Why the CSAT reports a standard score
The Korean CSAT (수능, College Scholastic Ability Test) does not report raw marks to universities. It reports a standard score (표준점수), a percentile, and a nine-level grade (등급). The reason is that candidates take different subject combinations, and raw marks across different papers are not comparable.
This is the same T-score construction used for Japanese hensachi, with a mean of 100 and a standard deviation of 20 instead of 50 and 10. For Korean and Mathematics the scale is set to mean 100; for the exploratory subjects it is conventionally set to mean 50 with SD 10.
A direct consequence, and one that drives real strategy: a harder subject yields a higher standard score for the same raw mark. If a paper was difficult, its mean falls, and every candidate's distance above that mean converts into more standard-score points. Candidates therefore sometimes benefit from a subject being hard — which is why year-to-year difficulty shifts are followed so closely.
The nine grades
| 등급 | Top cumulative % |
|---|---|
| 1 | 4% |
| 2 | 11% |
| 3 | 23% |
| 4 | 40% |
| 5 | 60% |
| 6 | 77% |
| 7 | 89% |
| 8 | 96% |
| 9 | 100% |
The cut-offs are fixed cumulative percentages chosen to approximate equal intervals on the normal curve, which is why the middle grades cover far more candidates than the extremes: grade 1 is 4% of the cohort, grade 5 is 20%.
Worked example
A candidate scores 84 raw on a paper with mean 62 and standard deviation 18.
표준점수 = 20 × (84 − 62) ÷ 18 + 100 = 20 × 1.222 + 100 = 124.4.
The Z-score of 1.222 corresponds to roughly the 89th percentile, placing the candidate in the top 11% — the grade 2 boundary. Note how close that is to the grade 1 cut at the top 4%: a handful of raw marks near the boundary can move a grade, and grades are what many admission tracks actually use.
Standard score, percentile or grade — which counts?
All three appear on the score report, and different admission tracks use different ones:
- 정시 (regular admission) generally uses standard scores and percentiles, combined under each university's own weighting formula. This is where the fine-grained differences matter.
- 수시 (rolling admission) typically uses the CSAT only as a minimum threshold (수능최저학력기준), expressed in grades — for example "sum of grades in three subjects ≤ 6". Here only the 등급 matters, and a standard score well above the boundary buys nothing.
Because 수시 accounts for a large share of intake, the grade boundaries often matter more to an applicant's actual outcome than the standard score does.
What the placement bands mean
The band table gives approximate historical mappings: grade 1 broadly corresponds to SKY (Seoul National, Korea, Yonsei) and medical-track territory, grade 2 roughly to Sogang, Sungkyunkwan and Hanyang.
These are rough references synthesised from public sources, not official cut-offs. Every university publishes its own formula, weights subjects differently by faculty, and revises the requirements annually. Medical faculties in particular sit far above the general band for their institution.
Common mistakes
- Comparing standard scores across years. They are normalised within each year's cohort and paper. A 130 one year is not the same achievement as a 130 the next.
- Comparing standard scores across subjects. Different papers, different distributions — only comparable within a subject.
- Optimising the total when a threshold is what binds. If your target is 수시 with a grade-based minimum, effort is better spent lifting a subject over a grade boundary than raising an already-safe subject.
- Using the exact percentile from a normal assumption. The calculator derives the percentile from the normal distribution. The official percentile comes from the actual rank distribution, which is not exactly normal, so figures near the boundaries can differ slightly.
Check the official sources
- KICE (한국교육과정평가원) — the examination authority; publishes each year's official means, standard deviations and grade cut-offs after the exam.
- 대학어디가 (Adiga) — the official admissions information portal, with per-university admission results.
The underlying standard-score mathematics is the same T-score conversion explained on the normal distribution page. This site is not affiliated with KICE or any Korean university.