How it is calculated
The date of birth is taken from today’s date: days first, then months, then years, borrowing when the anniversary day has not yet come. Days lived are the difference of the two calendar dates. A birthday on 29 February moves to 1 March in a year that is not a leap year.
Full years = today − date of birth, taking the month and day into account
Where the numbers come from
- Date of birth
Example
Someone born on 29 October 2000 is exactly 26 on 29 October 2026.
Questions
Does the time zone matter?
The calendar date from your browser is used, without the time of day.
Can I calculate age on a past date?
In this version, “today” is always the current day. The gap between any two dates is in the calculator next to this one.
Is the birthday today?
The calculator writes that in the “until birthday” line.