Korean age and D-day calculator
Enter your birthday to see all three ages used in Korea. Then count down to a deadline, or find the date 100 days from any start date.
Enter a full date, for example 1995-08-15.
How to use the calculator
- 1Pick Age and enter your date of birth. Today's date fills in by itself.
- 2Read your international age (만 나이), the age on forms and contracts.
- 3Pick D-day to count the days to an exam, a visa deadline or a move.
- 4Pick Date after to find the date 30, 90 or 100 days from a start date.
Good to know
- Since 28 June 2023, Korean law and official documents use international age (만 나이) unless a law says otherwise.
- A few laws still use year age (연 나이), your age by birth year only. Examples are the rules on buying alcohol and tobacco and on military service.
- Traditional Korean age (세는 나이) counts you as 1 at birth and adds a year every 1 January. You may still hear it in everyday talk.
- Korean 100-day celebrations such as a baby's 백일 (100일) count the first day as day 1. Tick the box to count that way.
Three ages in Korea
International age (만 나이) is the age most of the world uses: 0 at birth, plus one on each birthday. Since 28 June 2023 it is the standard age in Korean law, contracts and government forms.
Year age (연 나이) is this year minus your birth year, with no birthday check. Some laws still use it, so everyone born in the same year has the same year age.
Traditional Korean age (세는 나이) is year age plus one. Some older relatives may still ask your age this way.
Questions
What is my Korean age?
On forms and contracts, it is your international age (만 나이), the same age most countries use. Traditional Korean age is usually one or two years more.
Does Korea still use Korean age?
Not in law. Since 28 June 2023, laws and official documents use international age by default. Traditional age still comes up in casual talk.
What does D-100 mean?
On this page, D-100 means 100 days are left until the date, D-Day means the date is today, and D+10 means the date was 10 days ago.
How do I count 100 days for an anniversary?
In Korea the first day counts as day 1, so day 100 is 99 days after the start date. Use Date after with the box ticked.
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