🇰🇷 Korean Age Calculator (만 나이 · 세는나이 · 연나이)
Instantly see all three Korean age systems — 만 나이 (international/legal), 세는나이 (traditional counting age), and 연나이 (year age) — by entering your birth date. Free and runs entirely in your browser; nothing is uploaded or shared.
Enter your birth date
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만 나이
International Age (만 나이)
Exact age in completed years — the legal standard in Korea since June 2023, and the worldwide norm.
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세는나이
Korean Counting Age (세는나이)
Born as age 1, increments every New Year's Day. Traditional system still used in everyday conversation.
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연나이
Year Age (연나이)
Current year minus birth year — used in some legal/educational contexts (e.g. school grade placement).
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Enter your birth date above to see all three Korean age systems at once.
About
Korea officially adopted 만 나이 as its sole legal age standard in June 2023, replacing two older systems still common in daily life. This calculator shows all three side by side — with the days remaining until your next birthday — so you always know which number applies in each context. Because it runs 100% client-side, your date of birth never leaves your device.
How to use
- Open the calculator — no login, no installation required.
- Enter your date of birth in the date picker field.
- Click Calculate (or press Enter) — results appear instantly.
- Read your 만 나이 (legal age), 세는나이 (traditional), and 연나이 (year-based) all at once.
- Note the countdown to your next birthday shown under 만 나이.
FAQ
- Is this calculator free to use?
- Yes, completely free — no account, no subscription, and no ads to click through.
- Is my birth date uploaded to a server?
- No. All calculations happen locally in your browser. Your date of birth is never sent to any server.
- Does it work offline?
- Yes. Once the page is loaded, it works with no internet connection — useful when traveling or in restricted networks.
- What is the difference between 만 나이 and 세는나이?
- 만 나이 counts completed years from birth (the international standard, now Korea's legal age since June 2023). 세는나이 starts at 1 at birth and adds 1 every January 1st regardless of birthday, so it can be 1-2 years higher.
- What is 연나이 and when is it used?
- 연나이 is simply the current year minus your birth year — no birthday check. It is used in some Korean laws and educational contexts such as school grade placement.