No servers
Inputs remain on your device.
Age Calculator
Calculate exact age, total elapsed time, next birthday and birth weekday.
Calculations happen locally; dates and time zones are not transmitted.
How to use the age calculator
- 1
Enter the required dates, times or options.
- 2
Select Calculate to run the operation locally.
- 3
Review and copy each format or print the result.
Calendar accuracy in your browser
Explicit rules
Validates ranges, leap years and month changes.
International formats
Uses Intl and IANA to localize results.
Frequently asked questions
How is age calculated?
Complete calendar years, months and days are counted from the birth date to the reference date.
Are my dates sent to a server?
No. Every operation runs in your browser.
Which calendar is used?
It uses the Gregorian calendar and dates from years 1 through 9999.