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Korean age calculator
For centuries Koreans counted age differently: you are 1 at birth and everyone adds a year on New Year's Day. Since June 28, 2023 the law uses international age, but Korean age still lives on in conversation, K-dramas and a few rules. Calculate all three.
You are 1 at birth and add 1 every January 1.
Current year minus birth year. Used for military service, school entry and buying alcohol and tobacco.
Korea's official age since 2023, the same as in your country.
In Saju the year starts at Ipchun (입춘, around February 4). If you were born before it, your animal is the previous year's.
How Korean age works
Traditional Korean age (세는 나이, "counted age") starts at 1 on the day you are born. A common explanation is that it counts time in the womb, though historians disagree. The rule itself is clear: everyone adds a year together on January 1, not on their birthday.
That is why a baby born on December 31 is 2 in Korean age the next day. In K-dramas you will see two characters ask each other's birth year to find out who is older: Korean speech changes with age (oppa, unnie, hyung, noona).
On June 28, 2023 a law made international age the official age. Some rules still look only at the birth year, such as military service, primary school entry and buying alcohol and tobacco.
FAQ
How do you calculate Korean age?
Traditional Korean age = current year − birth year + 1. Your birthday does not matter: everyone adds a year on January 1.
Does Korea still use Korean age?
Since June 28, 2023 the official age is international age. Traditional age is still used in daily life and year age is used in some laws.
Why do Koreans ask your birth year?
Because the language changes depending on who is older. Knowing the year helps people choose how to speak to each other.