Age Calculator
Enter a birth date for today's exact age, or any reference date such as an application deadline.
How the age is counted
You are 0 at birth and gain a year on each birthday; the age shown is complete years and months as of the reference date. Since 28 June 2023 this international age is the legal age in Korea unless a law states otherwise.
Born on 29 February
In non-leap years the birthday is taken as 1 March. Some institutions use 28 February, so check when it matters.
Korean year age
Some Korean laws (military service, youth protection, school entry) use the current year minus the birth year, shown separately.
Tips for common situations
Check Exact Age on Any Cutoff Date
Change the reference date from today to a specific cutoff such as a visa deadline or enrollment date to see your completed years and months at that exact point. Total days and weeks lived are also shown for milestone tracking.
Track Baby Weeks and Days Since Birth
Enter your baby's birth date to see total elapsed days, completed weeks, and months for pediatric checkup scheduling. The next birthday countdown shows exactly how many days remain until upcoming milestones like the first birthday.
Leap Day Birthdays and Age Rules
For February 29 births, the calculator ages the person on March 1 in non-leap years, following the standard civil law rule. It also detects whether the next birthday falls in a leap year or not, so the days-until-birthday count is always accurate.
Tried with sample values
Screens and numbers from actually running this tool with sample values (2026-10-06, Chromium-based browser on a Mac). Results vary with your input and device.
With February 29, 2000 as the birthday and October 6, 2026 as the reference date, the calculator shows full age 26 years 7 months, calendar-year age 26, and Korean counting age 27. Total days lived is 9,716, or about 1,388 weeks.
Calendar-year age is labeled as the standard for military service, youth protection, and elementary enrollment. Counting age is noted as having no legal effect. The next birthday shows as March 1, 2027—for February 29 births, the birthday falls on March 1 in non-leap years.
Frequently asked
Is anything uploaded?
No. The birth date is used only in your browser and remembered only there for convenience.
How are months counted?
Complete months since the last birthday; if today's day of month is before the birth day, one month is subtracted.
Age at a future date?
Set 'As of' to that date, for example an exam or application deadline.
Does the tool calculate both Western full age and traditional Korean age systems?
Yes, it calculates standard international age (years and months), Korean year age, and traditional counting age simultaneously.
Can I see the total number of days and weeks I have lived?
Yes, entering your birth date computes the exact total number of days and weeks lived up to the reference date.
Does it display information about my upcoming birthday?
Yes, it shows the exact date and day of your next birthday along with a countdown of remaining days.
How are birthdays handled in non-leap years for people born on February 29?
For individuals born on February 29, the age increment takes effect on March 1 during non-leap years.