Korean Age Calculator

Hi Korea Hi tools

What’s my Korean age?

Korea actually uses three different ways to count age, and it trips up almost every visitor. Pop in a birthdate below and see all three at once.

Date of birth

International age

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Korea’s official legal age since June 2023

Korean age (세는 나이)

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You’re 1 the day you’re born, +1 every New Year’s Day

Year age (연 나이)

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Current year minus birth year — used for things like the drinking age

Quick way to remember it: your international age is what you’d use anywhere outside Korea, and it’s now the age used on Korean IDs, contracts, and hospital forms too. Your Korean age is the one grandmothers and older relatives still use in conversation, it’s why a Korean friend might casually claim to be a year or two older than you’d expect. And year age shows up specifically for things tied to the calendar year, like when you’re legally allowed to drink or buy cigarettes.

Once you’ve got your age sorted out, the next thing that trips people up is actually talking to anyone. I put together the real phrases for restaurants, shops, cafes, and taxis, worth a look before your trip.

Prices in Korea come with their own sale signs, “1+1,” “정가/세일가,” percentage stickers that don’t always mean what you’d guess. I put together a sale price calculator that works out the final price in won and your currency, plus a quick guide to what those signs actually mean.

Three ages, and which one counts

Korea has used three different ways of counting age at the same time, which is why the question “how old are you?” here has never had one clean answer.

International age (만 나이) — the one you already use. You’re 0 at birth and gain a year on each birthday.
Korean age (세는 나이) — you’re 1 the day you’re born, and everyone gains a year together on 1 January. A baby born on 31 December is 2 the next morning.
Year age (연 나이) — current year minus birth year. No birthday involved.

What changed in 2023

On 28 June 2023 a law took effect making international age the standard for law and administration. If an age appears in a contract, a form, a hospital record or a government document and nothing says otherwise, it now means international age — the same number as at home.

This mattered more inside Korea than outside it. Before the change, the same person could be three different ages on three different pieces of paper.

Where year age still applies — and this is the part that affects visitors

The 2023 law didn’t abolish year age. Several statutes kept it deliberately, and one of them you will run into.

Alcohol and tobacco

The Youth Protection Act still works on year age, not your birthday. In practice: everyone born in the same calendar year becomes eligible on the same day — 1 January — regardless of when in the year their birthday falls.

So a visitor whose birthday is in November is not waiting for November. If your birth year clears the line, the shop can sell to you from the first of January. Convenience store staff are checking the year printed on your ID, not doing arithmetic against today’s date.

Bring photo ID with a date of birth. A passport works everywhere; a foreign driving licence often doesn’t. Being visibly in your thirties doesn’t exempt you — some chains scan every ID as policy, and the fine falls on the shop, not on you.

The others

Military service — the Military Service Act uses year age. This is why Korean men talk about their conscription year rather than their birthday.
Starting school — children enter primary school in the March following the year they turn 6 by international count, so a class is a birth-year cohort rather than a birthday range.
Some civil service exams — minimum ages are set by year.

What a Korean means when they ask your age

Socially, Korean age hasn’t gone anywhere. The law changed the paperwork; it didn’t change what people say over dinner. Someone your parents’ age may still answer in Korean age without thinking about it, and among people over about forty it’s still the default in conversation.

There’s a reason the question comes up so fast, and it isn’t nosiness. Korean has different speech levels and different words for older siblings and friends, and which ones apply depends on who is older. Asking your age is how someone works out how to address you. Once that’s settled the question doesn’t come back.

What matters most is the birth year, not the exact date. Two people born in the same year usually treat each other as equals — 동갑 — no matter that one was born in January and the other in December. If you only remember one thing, remember your birth year in Korean numbers.

Doing it in your head

The calculator above is faster, but the arithmetic is simple enough to do at a table:

Korean age = current year − birth year + 1
Year age = current year − birth year
International age = year age, minus 1 if your birthday hasn’t happened yet this year

Which means Korean age is either one or two years above your real age, depending on whether you’ve had your birthday. That gap is where most of the confusion comes from.

Sources

The age standardisation law and its exceptions are set out by the Korean government at korea.kr and by the Ministry of Government Legislation’s age unification page.