Korean age calculator
Korea switched to international age in June 2023 — but you will still hear the old “Korean age” at family dinners and in K-dramas. Enter your birthday to see all three Korean ages, plus your saju animal and Day Master.
Three ways to count age in Korea
International age (만 나이, man-nai) is the age most of the world uses: you start at 0 and add a year on your birthday. Since June 28, 2023 it is the default for Korean laws, contracts and official documents.
Korean age (세는 나이, counting age) starts at 1 on the day you are born, and everyone adds a year together on New Year’s Day. A baby born on December 31 is “two” the next morning. This is the age older Koreans — and many K-drama characters — still use in conversation.
Year age (연 나이, yeon-nai) is simply this year minus your birth year. It still appears in a few rules, such as the youth-protection limits on buying alcohol and tobacco, and military service — so a whole birth year “comes of age” on the same January 1.
Why age matters so much in Korea
Age decides how people speak to each other. It sets who uses polite speech first and which family-style titles fit — unni, oppa, noona, hyung. That is why “What year were you born?” is often one of the first questions between new acquaintances.
You may also hear about ppareun (빠른, “early”) birthdays: people born in January or February who, under the old school calendar, started school with the year above them and often count themselves in that older group.
Korean birthday traditions: seaweed soup, baekil and doljabi →
Your birth year in Korean saju
Saju has its own year boundary. The year — and your zodiac animal — changes at Ipchun, the Start of Spring, around February 4, not on January 1 or at Lunar New Year. If you were born in January or early February, your saju animal belongs to the previous year. Why the saju year starts in February →
Your year animal is only one of the eight characters in your chart. The most personal one is your Day Master, set by the day you were born — find yours free.
Questions
What is my Korean age?
Traditional Korean age counts you as 1 at birth and adds a year every January 1. So it is the current year minus your birth year, plus one — usually one or two years more than your international age.
Does Korea still use Korean age?
Not officially. Since June 28, 2023, laws and official documents use international age (만 나이). The old counting age is still heard socially, in K-dramas and among older relatives.
What is year age (연 나이)?
Year age is the current year minus your birth year, with no birthday adjustment. Some rules still use it — for example the youth-protection limits on buying alcohol and tobacco, and military service.
Why do Koreans ask your age?
Age sets the speech level and titles people use with each other — who says unni, oppa, noona or hyung, and who speaks first in polite form. Knowing your birth year is the quickest way to place yourself.