Korean Age Calculator
Convert your age to the traditional 🇰🇷 Korean system in real time.
🧮 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.
Use this Korean Age Calculator to estimate traditional Korean age from your birth year or current international age. It also shows international age and year age for comparison.
Korean Age Calculation Methods
Traditional Korean age:
Korean age = current year − birth year + 1
Under the traditional system, a person is considered 1 year old at birth and becomes one year older every January 1.
International age:
If your birthday has passed this year:
Age = current year − birth year
If your birthday has not passed:
Age = current year − birth year − 1
Year age:
Year age = current year − birth year
Year age uses only the birth year and does not check whether the birthday has passed.
Example
Suppose someone was born in 2000 and the current year is 2026.
Traditional Korean age = 2026 − 2000 + 1 = 27
The person’s traditional Korean age is 27.
Their international age would be 25 or 26 depending on whether their birthday has occurred in 2026.
Important Notes
- Traditional Korean age is mainly useful today for cultural, informal, or historical comparison.
- Since June 28, 2023, South Korea generally uses international age for civil and administrative purposes.
- Some specific laws or systems may still use separate age-counting rules.
- Do not use traditional Korean age to determine legal eligibility, age restrictions, contracts, immigration, military requirements, or other official matters.