Reference date before the birthday
Input: Born 2000-05-15, reference 2026-05-14
Result: Man age 25, counting age 27, year age 26
Korean Age Calculator (Full Age)
Calculate Korean man age (international age), counting age, and year age from your birth date. Also shows the total days lived and the countdown to your next birthday.
Birth Date
Defaults to today; you can also calculate as of any other date.
Formula and decision logic
Age in years counts how many full years have passed since the birth date — incrementing on the birthday itself. Korean traditional “counting age” adds 1 to the year difference, while “year age” uses just the year difference.
Man age = years between birth and reference date (decrement if birthday not yet reached)
Counting age = (reference year − birth year) + 1
Year age = reference year − birth year
Worked examples
Reference date on the birthday
Input: Born 2000-05-14, reference 2026-05-14
Result: Man age 26 (increments on the birthday itself)
How to use this calculator
- 1Pick your birth date
- 2Confirm or change the reference date (default today)
- 3Press Calculate to see man age
- 4Review counting age, year age, and the next-birthday countdown
How to read the result
- Man age is the legal default in Korea since June 2023; most public records now follow it.
- Counting age and year age still appear in cultural or some legal contexts (e.g., grade-level, military), so checking all three avoids confusion.
Common input mistakes
- Assuming the age increments at the start of the year (that is counting age, not man age).
- Mixing up “year age” and “man age” when reading older Korean documents.
Frequently asked questions
How is man age calculated?
It is the number of complete years that have passed since your birth date. It increments on each birthday and is the legal default age in Korea since June 2023.
What are counting age and year age?
Counting age is the traditional Korean age — you are 1 at birth and gain a year every January 1. Year age is simply current year minus birth year and appears in some laws (e.g., military, school grade).
Why show all three?
Documents, eligibility rules, and discounts may use different age systems, so seeing all three avoids surprises.
How are Feb 29 birthdays handled?
In non-leap years there is no Feb 29, so the man age does not increment until the date returns. This calculator follows the “increment on the birthday itself” rule.