Enter your birth date to get your exact age in years, months, and days, how many days you've been alive, and a countdown to your next birthday.
Most countries use a single 'age' concept — full years elapsed since birth, which is what this tool calls international age. Korea traditionally also used two other counting styles: a 'Korean age' that adds a year at birth and again at every New Year, and a 'counting age' based on the current year minus birth year. Since June 2023, Korean law and administration officially use international age, though a few statutes still reference counting age.
International age starts you at 0 at birth and adds a year on each birthday. It is the global standard.
East Asian age reckoning starts you at 1 at birth, and everyone gains a year on 1 January. Someone born on 31 December was traditionally 2 the next day.
Year age is current year minus birth year, independent of birthday.
Korea unified its legal ages to the international reckoning in June 2023, though a few schemes still use year age.
Military service in Korea is assessed by year age — those turning 19 in a given year.
Alcohol and tobacco purchase uses year age 19, meaning eligibility starts on 1 January regardless of birthday.
School entry is effectively year-based, tied to turning six by a fixed date.
Calculating any of these with international age gives the wrong answer, which is why this tool shows all three.
You age on the birthday itself, from midnight.
29 February birthdays have no date in common years. Jurisdictions differ between 28 February and 1 March; this tool uses 1 March.
On the counting basis: legally the birth date is day zero, so "the day you turn 20" is your twentieth birthday itself, not the day before.
Driving eligibility starts somewhere between 16 and 18 in most countries, varying by licence class.
18 is the age of majority in most jurisdictions, and the voting age in many.
In the United States, alcohol purchase starts at 21.
65 is the common reference point for pension and senior benefits, though actual pension ages are rising in many countries and often depend on birth year.
This tool calculates ages; it does not determine eligibility. Check requirements with the relevant authority.
The countdown shows the remaining days and which day of the week it falls on — a weekend makes gatherings easier, a weekday needs planning.
Total days lived is shown too. Round numbers like 10,000 days (about 27.4 years) and 20,000 days (about 54.8 years) make good excuses to mark the occasion.
Two people with the same international age can have different year ages depending on whether their birthday has passed — a difference that occasionally matters on forms.
Your date of birth is not transmitted; the calculation runs entirely in the browser.
Date of birth is itself sensitive personal data — it is a standard identity verification field — so that distinction is meaningful here.
It counts full years, then the remaining months and days from your birth date to today (or any reference date).
Yes — alongside the international age it also shows the Korean 만 / 세는 / 연 age styles.
In non-leap years, the countdown treats the closest date (usually February 28) as the substitute, so leap-year birthdays don't disappear.
What this tool bases its numbers on, and how far those numbers go.
International age = completed years since the birth date, then the remaining months and days. Year age = current year − birth year. Korean counting age = current year − birth year + 1. Days alive = the difference in days between the two calendar dates.Born 1990-03-15, evaluated on 2026-08-26: international age 36 years 5 months 11 days, year age 36, counting age 37, and 13,313 days alive.