Enter your birth date to see your exact age and total days lived.
Age is calculated by comparing today's date to the birth date. The year count increases each birthday; the remaining months and days are computed from the anniversary of the last birthday. Total days lived is the simple difference in calendar days between birth and today.
To calculate age, subtract the birth date from today's date, then adjust the year count for whether this year's birthday has occurred yet. Example: someone born March 22, 1998 is, as of July 16, 2026, 28 years, 3 months, and 24 days old, since that year's birthday has already passed.
Subtract 2000 from the current year; if this year's birthday has already passed, that's your age — if not, subtract one more. Someone born in 2000 turns (current year − 2000) after their birthday this year, or one year less before it.
Simply subtracting the birth year ignores whether this year's birthday has passed; if today's month and day come before the birth month and day, subtract one more year from that simple difference to get the correct age.
Subtract the birth year, month, and day from today's year, month, and day separately; if the day difference is negative, borrow one month (adding the previous month's day count); if the month difference is then negative, borrow one year (adding 12 months). The three results are the years, months, and days of age.
Total days lived counts every calendar day from birth to today, including every leap-year day, without rounding into years and months — it's simply (today's date − birth date) in days, the single most precise number for how long someone has been alive.
No — since Korea's Age Unification Act took effect in June 2023, official and legal procedures use only international (만) age, which is what this calculator computes.
Some cultures use counting age, which starts at 1 at birth and adds a year at New Year's, one to two years ahead of international age, which starts at 0 and adds a year on each birthday — this calculator uses international age only.
Count from today to the next occurrence of your birth month and day (this year if it hasn't happened yet, next year if it has) — the result is 365 days in most years, or 364/366 depending on whether a leap year falls in between.
No — it compares calendar dates only, using the device's local date; the hour or time zone of birth does not affect the year, month, and day result.
| Birth date | Age | Total days lived | Next birthday in |
|---|---|---|---|
| 1998-03-22 | 28y 3m 24d | 10,343 days | 249 days |
| 2000-01-01 | 26y 6m 15d | 9,693 days | 169 days |
| 1990-12-31 | 35y 6m 15d | 12,981 days | 168 days |
| 2010-07-16 | 16y 0m 0d | 5,844 days | 365 days |
| 1985-07-15 | 41y 0m 1d | 14,976 days | 364 days |
Subtracting years alone ignores whether the birthday has already happened this year. If today's month and day come before the birth month and day, a full year has not yet passed, so one year is subtracted from the simple difference.
Total days lived counts every calendar day between the birth date and today, including leap-year days, with no rounding to months or years. It is the most precise single number for how long someone has been alive.
It depends on whether a leap year falls between today and the next birthday. If today is the birthday itself, the countdown is set to a full year until the following one.
No. It compares calendar dates only, using the device's local date. Time of day and time zone do not affect the year, month, and day breakdown.
This calculator works with calendar dates only; it does not account for time zones or the exact hour of birth. Results are for general reference — for legal or medical age requirements, confirm the exact calculation method required in your context.
Last updated: 2026-08-17