Korean age comparison
Compare full age, calendar age, and traditional Korean counting age on the same date.
Your inputs
Choose your dates and the calculation convention. Results update as you edit.
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How it works
- Full age (만 나이): Completed years
- Calendar age (연 나이) = (Year) − (Year)
- Traditional counting age (세는 나이) = Calendar age (연 나이) + 1
- Worked example: For someone born on 2000-12-31, compare the age systems on 2026-01-01. Their birthday has not yet occurred that year, so full age differs from calendar age and traditional counting age.
- Full age (만 나이) = 25; Calendar age (연 나이) = 2,026 − 2,000 = 26; Traditional counting age (세는 나이) = 26 + 1 = 27.
Input and formula key
Your result
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Assumptions and limitations
Full age counts completed birthdays using your selected February 29 convention. Calendar age is the difference between year numbers; traditional counting age adds one. These are arithmetic comparisons on the entered date, not a determination of legal eligibility or which age rule a particular service applies.
Sources
- Korea.net — Full, calendar, and counting age Sources reviewed: 2026-10-05
- Ministry of Government Legislation — Full-age reform and exceptions Sources reviewed: 2026-10-05
