Age Calculator
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Age Calculator
Every number is calculated in your browser. Nothing is sent to a server.
How it works
About this calculator
Enter a birth date to see full years, months and days, total time lived, the weekday you were born on and a live countdown to your next birthday. Leap days and month lengths are handled exactly.
Local calendar maths
Ages are counted on your calendar, so 31-day months and leap years never shift the result by a day.
February 29
If you were born on a leap day, a non-leap-year birthday is observed on 1 March for the countdown.
Private by default
The date never leaves the page. Refresh and it is gone.
Questions & answers
Frequently asked
Does the calculator count leap days?
Yes. It counts real calendar days between the two dates, not an average month length.
Why can my age differ by one day in another time zone?
A birthday is a local calendar date. If it is already tomorrow in another country, the countdown there is one day shorter.
Results are provided for convenience. For legal, payroll or medical decisions, confirm with a qualified professional.