What Is the Korean Age Calculator?
This tool converts your birth year into your traditional Korean age. In the long-standing Korean counting system, a baby is considered 1 year old at birth, and everyone gains a year together on January 1st — not on their individual birthday. As a result, a person's Korean age is usually one or two years higher than their international (Western) age.
How to Use It
Enter your birth year and the current year (this defaults to the present year). The calculator returns your Korean age along with your Western age for comparison. No month or day is needed because the simplified yearly method only depends on the calendar year.
The Formula Explained
The core equation is simple:
$$\text{Korean age} = \text{current year} - \text{birth year} + 1$$
The "+ 1" accounts for the fact that you start life at age 1 rather than 0. The Western age is just \(\text{current year} - \text{birth year}\).
Worked Example
Suppose you were born in 1995 and the current year is 2024. Your Korean age is $$2024 - 1995 + 1 = 30,$$ while your Western age is \(2024 - 1995 = 29\). So in Korea you'd say you are 30 (서른 살).
FAQ
Why is my Korean age higher? Because Korean tradition counts the time in the womb as the first year, making you 1 at birth.
Did Korea change its age system? Yes — in June 2023, South Korea officially adopted the international age system for legal and administrative purposes. This calculator shows the traditional cultural age many people still use casually.
Does my birth month matter? In the simple yearly system shown here, no. Everyone's Korean age increases on January 1st regardless of birthday.
