Korean Age Calculator
Convert your age to the traditional 🇰🇷 Korean system in real time.
🔀 Calculate using
Both methods should match when inputs are equivalent.
Gregorian calendar year.
Enter birth year (no exact date).
🇰🇷 Korean age
Traditional system: 1 at birth, +1 every Jan 1.
Quick summary
Enter values above to see your result.
🧮 Step-by-step derivation
📚 Reference
| System | Rule | Formula (given) |
|---|---|---|
| International age | 0 at birth; +1 on birthday | Age = current year − birth year (adjust by birthday) |
| Korean age (traditional) | 1 at birth; +1 each Jan 1 | By year: (CY − YOB) + 1 | By age: age + 1 (if passed) else + 2 |
| “Year age” | Same birth year ⇒ same age | CY − YOB |
South Korea adopted international age for official use in 2023, but the traditional “Korean age” is still commonly used informally.