Weighted average calculated by (Units x Rank) / Total Units
※ The results may vary slightly depending on specific school policies. Please double-check with your official transcript.
How Grades Are Calculated
High school grades are calculated based on the Weighted Average Method. This means that subjects with higher units (more class hours) have a greater impact on your final grade.
For example, if you get a Rank 1 in a 4-unit Math class, it counts 4 times as much as a Rank 1 in a 1-unit elective class.
Grade Types & Conversions
Our calculator supports various grading systems used in Korean high schools. We convert them into a standard 1-9 rank scale for calculation.
1. Rank (1-9)
The standard relative evaluation system. Use the exact rank documented on your transcript.
2. Achievement (A-E)
Used for specialized subjects or absolute evaluations. Converted as follows:
| Achievement | A | B | C | D | E |
|---|---|---|---|---|---|
| Rank Conversion | 1 | 3 | 5 | 7 | 9 |
3. Traditional (Su-Ga)
Traditional 5-scale grading system.
| Grade | Su | Wu | Mi | Yang | Ga |
|---|---|---|---|---|---|
| Rank Conversion | 1 | 3 | 5 | 7 | 9 |
Tips for Accurate Calculation
- Check Units: Ensure the 'Units' (weekly class hours) are entered correctly. This is the most common source of error.
- Semester Sync: Use the "Copy 1st Sem" button to quickly duplicate subjects from the first semester to the second, then adjust only the grades.
- Exclude P/F: Subjects marked as Pass/Fail without a specific grade should not be included in this calculation.
Reading Weighted Grade Results
A Korean high school grade average is a weighted average: each subject's grade times its credit units, divided by the total units. Subjects with more units weigh more.
Worked example: A three-subject example
- Korean: grade 2 × 4 units = 8
- Math: grade 3 × 4 units = 12
- English: grade 1 × 3 units = 3
- (8 + 12 + 3) ÷ 11 units = 2.09
A plain average of the grades is 2.0, but weighting by units gives 2.09 because math carries more units.
Before you rely on the result
- Enter each subject's units exactly as on the transcript.
- Check whether achievement-only (A–E) subjects are excluded from the average.
- Universities differ in which subjects and years they count.
- Admission scores must be recalculated with each university's own rules.
Frequently asked questions
Did the grading system change for students entering high school in 2025?
Yes. From first-year students in 2025, Korean high schools use a 5-level relative scale. Do not mix 9-level and 5-level grades in one average.