๐ Age Calculator
Enter your date of birth to calculate your international age, Korean age, total days, and more.
What is International Age?
International age starts at 0 at birth and increments by 1 only when the birthday passes each year.
What is Korean Age?
Korean age starts at 1 at birth and adds 1 every January 1st. Since 2023, Korean law officially uses international age for public purposes.
Worked Examples
Born on 15 March 1990, on 14 March 2025 you are 34 years old; the next day you turn 35.
By 1 January 2025 someone born in March 1990 has lived 12,710 days, which is 34 years and 9 months.
Which Age Counts as Your Age
The main figure is international (completed) age: it increases on your birthday and is the age used by passports, schools and most contracts. Korean age starts at 1 at birth and adds a year every 1 January, and since June 2023 Korea also uses international age in law. Japan traditionally used ๆฐใๅนด, still visible in ๅๅนด calculations. Dates are read in your device time zone.
Frequently Asked Questions
- Why is Korean age one or two years higher?
- Korean age counts the birth year as year one and adds a year on 1 January, so it runs one or two years ahead of international age depending on the date within the year.
- How is a 29 February birthday handled?
- In law most countries treat 28 February or 1 March as the birthday in non-leap years. This calculator compares month and day directly, so the age advances on 1 March in those years.
- Why can two age results differ by a day?
- Time zones and the time of birth matter: a birth just before midnight in another zone can land on a different local date, which is why the reference date field is editable.