DOBcalc

Korean Age Calculator

Calculate your Korean age (세는 나이) — and see how it differs from international age and the new official standard.

Results update instantly — no button needed · Calculated in your local timezone

Select your date of birth to see results instantly

Three ages, one result card

Korea historically used three systems at once: Korean age (세는 나이), calendar age (연나이, birth-year based), and international age (만 나이, birthday based). Since June 2023, official documents use international age — but 세는 나이 still rules everyday speech, drinking-age banter and K-pop fandom math.

The result card computes all three from your birth date so you can see exactly where the systems disagree — usually by one or two years, never more.

How Korean age (세는 나이) works

You are 1 on the day you are born — gestation counts as your first year. On 1 January everyone in Korea gains a year simultaneously, regardless of birthday. So a baby born on 31 December is 2 years old (세는 나이) the very next day.

That makes the formula simple: Korean age = current year − birth year + 1. No birthdays involved — which is also why the number feels so inflated compared to international age.

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Frequently asked questions

＋How do I calculate my Korean age?

Korean age = current year − your birth year + 1. Select your date of birth above and the calculator does it instantly, alongside your international age for comparison.

＋Why is my Korean age older than my international age?

Two reasons combined: you start at 1 instead of 0, and the year increments on 1 January rather than your birthday. Born on 31 December? Both stack — you are 2 (Korean) the next day while being 1 day old internationally.

＋Is Korean age still used officially?

No. Since 28 June 2023, Korean law and all official documents use international age (만 나이). 세는 나이 survives in casual conversation and social contexts.

＋What is the drinking/voting age in Korea under the new law?

Under the international-age standard, you may buy alcohol or vote from the calendar day you turn 19 (international age). The calculator above shows that date via your exact years count.