Krush Tools
Korean Age Calculator
Enter your birthdate to compare your Korean age (세는나이), international age, and year age (연나이) side by side. Free, private, and no sign-up.
Nothing is saved or sent anywhere — the maths happens right here in your browser.
Pick your birthdate to see your Korean, international, and year age.
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Try KrushWhat is Korean age?
Korean age — 세는나이, or "counting age" — is the traditional way age was reckoned across much of East Asia. Under this system you are 1 year old the moment you are born, and everyone turns a year older together on January 1st rather than on their individual birthday. It's the number you'll still hear in K-dramas, in K-pop fan circles, and when Korean friends ask "몇 살이에요?" (how old are you?).
How Korean age is calculated
The formula is refreshingly simple — no birthday required:
Korean age = current year − birth year + 1
Someone born in 2000 is 27 in Korean age throughout 2026 (2026 − 2000 + 1), whether or not their birthday has passed.
Korean age vs international age vs year age
Three systems, three numbers — this is why they differ:
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International age (만 나이)
Full years actually lived; increases on your birthday. The global standard — and now South Korea's official system.
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Korean age (세는나이)
Starts at 1 at birth and everyone ages up on New Year's Day. Traditionally the number used in daily conversation.
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Year age (연나이)
Current year minus birth year. Still used in a handful of Korean laws, like conscription and age limits for alcohol and tobacco.
Why Korean age can be 1–2 years older
Two rules stack up. First, Korean age starts counting at 1 instead of 0, which adds a year. Second, it advances on January 1st instead of your birthday — so from New Year until your birthday, you've "aged up" in Korean age but not yet in international age, adding a second year. That's why your Korean age is 1 year older after your birthday and 2 years older before it.
Did Korea abolish Korean age?
In June 2023, South Korea standardised on the international age system for legal and administrative purposes, retiring traditional Korean age from official documents and services. Culturally, though, it's far from gone — people still reference it casually, which is exactly why so many still search "what's my Korean age?" This calculator is for that cultural and reference curiosity, not for legal age verification.
Common uses
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K-pop idols
Work out how old your bias really is in both systems.
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K-dramas
Make sense of "we're the same age" and 언니/오빠/형/누나 dynamics.
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Dating
Understand age etiquette when you're meeting someone Korean.
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Friendships
Korean friendships often hinge on who's older by even a year.
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School years
See how age-based school cohorts line up.
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Cultural context
Follow age references in interviews, variety shows, and lyrics.
Frequently asked questions
What is Korean age?
Korean age (세는나이, "counting age") is a traditional East Asian way of counting years where you are considered 1 year old the day you are born, and everyone gains a year together on January 1st — not on their birthday. It made a person up to two years older than their international age.
How do I calculate my Korean age?
Subtract your birth year from the current year and add 1. For example, someone born in 2000 has a Korean age of 2026 − 2000 + 1 = 27 in the year 2026, regardless of whether their birthday has passed. This calculator does it for you and also shows your international and year age.
Why is Korean age different?
Because it counts differently on two points: you start at 1 (not 0) at birth, and you gain a year on New Year's Day rather than on your birthday. Those two rules make Korean age 1 year higher than international age after your birthday, and 2 years higher before it.
Is Korean age still used in Korea?
Informally, yes — many people still mention it in conversation, and it remains culturally familiar through K-pop, K-dramas, and everyday introductions. Officially, though, South Korea now uses international age for legal and administrative purposes.
Did Korea abolish Korean age?
In June 2023 South Korea standardised on the international age system for legal and administrative matters, effectively retiring traditional Korean age from official use. It lives on culturally, which is why people still look it up.
What is international age?
International age is the standard age used worldwide: the number of full years you have actually lived. It increases by one on each birthday. This is now also the official age system in South Korea.
What is year age?
Year age (연나이) is simply the current year minus your birth year, ignoring whether your birthday has passed. South Korea still uses it in a few specific laws — such as military conscription and the legal age for buying alcohol and tobacco.
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