Age Calculator
Enter a date of birth to see your exact, calendar-year and Korean age, the days to your next birthday and the days lived.
How to use
- Pick or type your date of birth.
- The reference date is today by default. Change it to see the age on another day, for example 2027-01-01.
- Exact age, calendar-year age and Korean age appear at once, with your next birthday, the days left, the days lived and the weekday you were born.
- Use Copy result to copy the answer, or Copy link to share the page with your inputs filled in.
FAQ
How is exact age calculated?
Subtract the birth year from the reference year, then subtract one more if the birthday has not come yet that year. Born on 5 May 1990, you are 35 on 1 March 2026 and 36 on 8 November 2026.
What is Korean age, and how does it differ from international age?
Korean age counts the birth year as age 1 and adds a year every 1 January, so it equals calendar-year age plus 1. Someone born in 2000 is 27 in Korean age in 2026, while the exact (international) age is 25 or 26 depending on the birthday.
Which age does Korea use officially?
Since 28 June 2023, laws, contracts and official documents count age as exact age, under Article 158 of the Civil Act and Article 7-2 of the Framework Act on Administrative Affairs. Korean age remains an everyday way of speaking.
What is calendar-year age?
The reference year minus the birth year, so someone born in 2000 is 26 in 2026. A few laws still use it; for example the Youth Protection Act stops treating a person as a minor from 1 January of the year they turn 19.
When does exact age go up for a 29 February birthday?
In years that are not leap years the one-year period ends on 28 February (Civil Act art. 160(3)), so the age goes up on 1 March. Born on 29 February 2000, you are 24 on 28 February 2025 and 25 on 1 March 2025.
How do I find the age on a specific date?
Change the reference date. Born on 15 June 2000 and measured on 1 January 2027, the exact age is 26, the calendar-year age 27 and the Korean age 28.
Does it show how long until my next birthday?
Yes. It shows the next birthday date, the days left (0 on the birthday itself), the days lived and the weekday you were born.
Can I use a birth date after the reference date?
No. The birth date cannot be later than the reference date, so a message asks you to fix it.