Korean School Grade Calculator
Use either Korea’s 5-level system for students entering high school from 2025 or the earlier 9-level system. Calculate a course-weighted subject average or convert subject rank to an estimated grade.
Scope of the Korean School Grade Systems and Results
Reference date and last reviewed: August 1, 2026
Calculation Basis
Uses the 5-level and 9-level cumulative cutoffs, rounded enrollment bands, and tied middle-rank principle described in Korea's Ministry of Education admissions reform and school-record management guidance.
Reference Limits
The subject average is a baseline credit-weighted calculation. It does not determine a university's included subjects, year weights, career-elective conversions, small-class treatment, rounding, or all tie rules. The result is not an official transcript grade or university conversion score.
When to Confirm Officially
Use the school's transcript and academic assessment rules for official grades, and use the applicable university admissions guide or admissions-office formula for an application conversion.
Usage Tips
Match the transcript system before combining Korean school grades
Choose the 5-level system for students entering Korean high school from 2025 or the earlier 9-level system, then enter each subject’s rank grade and credits or units for a weighted average. If only rank is known, add that subject’s enrollment and tied group size to estimate the grade band. University admission formulas vary by subjects, school years, and elective conversions, so compare the result with the applicable admissions guide.
What is Korean School Grade Calculator?
The Korean School Grade Calculator uses transcript rank grades and course credits to calculate a credit-weighted naesin average, and it estimates a subject rank grade from class rank and enrollment. It supports Korea's 5-level system being phased in for students who entered high school from 2025 and the earlier 9-level system used by students who entered through 2024. Subjects without a recorded rank grade can be marked as excluded.
How to Use
- 1 Choose the 5-level or 9-level system that matches the high school entry year and transcript.
- 2 In subject-average mode, enter each subject, its credits, and its rank grade. Mark subjects without a rank grade as excluded.
- 3 Review the credit-weighted grade, simple average, included credits, subject count, and grade distribution.
- 4 To convert rank to grade, switch modes and enter the rank within the subject, that subject's enrollment, and the tied group size including the student.
- 5 Review the estimated rank grade, middle-rank percentage, and enrollment-specific rank bands.
A higher-credit subject has more influence on the weighted school grade
Last reviewed: August 1, 2026Weighted naesin and tied middle-rank formulas
Weighted grade = Σ(rank grade × credits) ÷ Σcredits · Middle rank = rank + (tied students − 1) ÷ 2
Only subjects with a rank grade enter the weighted average. With no tie, rank grade uses rounded cumulative student bands; with a tie, it uses the middle-rank percentage.
Credit-weighted average for four subjects on the 5-level system
- • Common Korean: 4 credits, Grade 2; Common Mathematics: 4 credits, Grade 1
- • Common English: 3 credits, Grade 2; Integrated Science: 3 credits, Grade 3
- • Select the 5-level system
- 1. Grade-credit total = 2×4 + 1×4 + 2×3 + 3×3 = 27
- 2. Included credits = 4 + 4 + 3 + 3 = 14
- 3. Credit-weighted grade = 27 ÷ 14 = 1.9285…
- 4. Simple subject average = (2 + 1 + 2 + 3) ÷ 4 = 2.00
The credit-weighted grade is 1.93, while the simple subject average without credit weighting is 2.00.
How to read the result
- A value closer to Grade 1 represents stronger results, but a 5-level average and a 9-level average are different scales and should not be compared directly.
- A noticeable gap between weighted and simple averages means higher-credit subjects are changing the overall result more strongly.
Conditions that change the result
- University transcript conversions may use their own included subjects, school years, career electives, credit rules, and point gaps between grades.
- Small-enrollment subjects, shared courses, online-school courses, and designated convergence electives may omit rank grades or follow additional school rules.
Common input mistakes
- Do not mix grades from the 5-level and 9-level systems into one average.
- Do not exclude the student from the tied count or invent a rank grade for a subject whose transcript does not provide one.
Reference Knowledge
- ● The credit-weighted average is the sum of each rank grade multiplied by credits, divided by total included credits.
- ● The 5-level cumulative cutoffs are 10%, 34%, 66%, 90%, and 100% for Grades 1 through 5.
- ● The 9-level cumulative cutoffs are 4%, 11%, 23%, 40%, 60%, 77%, 89%, 96%, and 100% for Grades 1 through 9.
- ● Cumulative student counts are calculated by multiplying enrollment by each cumulative cutoff and rounding the result.
- ● When tied students cross a grade boundary, the middle-rank percentage is used. Middle rank equals rank plus (tied students minus 1) divided by 2. Enrollment means students taking that subject, not the whole school population.
- ● Under the 2022 revised curriculum, some subjects—including designated social/science convergence electives, Science Inquiry Experiment, physical education, arts, and liberal arts—do not record a rank grade.
- ● Korean universities may apply their own subject coverage, year weights, career-elective conversions, credit rules, and rounding, so the applicable admissions guide takes precedence.
FAQ
Q. Do Korean first- and second-year high school students use the 5-level system in 2026?
Under the 2026 phased application, students under the 2022 revised curriculum in Years 1 and 2 use the 5-level system, while Year 3 students under the earlier curriculum use the 9-level system. The transcript and high school entry year are the best practical checks.
Q. Can I simply average all subject grades?
Only when every subject carries the same credits. If credits differ, multiply each rank grade by its credits and divide the total by all included credits.
Q. Should subjects without a rank grade be included?
Exclude them from this rank-grade average. A university may still convert achievement levels or achievement distributions separately, so check the admission track's formula.
Q. Does the tied-student count include me?
Yes. Enter the full group sharing the same starting rank. If three students are tied at rank 5, enter rank 5 and a tied count of 3; the middle rank is 6.
Q. Can a grade band contain no students in a small class?
Yes. Rounding cumulative counts can produce identical adjacent boundaries, leaving a band with zero students. Official handling follows the school's academic assessment rules.
Q. Is this weighted average the same as a university admission score?
No. This is a baseline credit-weighted average of the entered rank grades. Universities can select subjects, apply year weights, use top subjects, and convert career electives differently.
