DATE & AGE TOOL
Age in Weeks Calculator
Find your age in completed weeks and see the underlying day count.
How this calculator works
This tool uses calendar dates directly. Date differences are calculated from UTC-normalized calendar dates to avoid daylight-saving-time changes affecting the result. Calendar age is expressed in years, months and days rather than estimating a year as exactly 365 days.
Why use this tool?
It is designed for quick, transparent calculations without requiring an account. Your date inputs are processed in your browser by the current version of the site.
Frequently asked questions
Does this calculator account for leap years?
Yes. Calendar calculations use the actual dates in the Gregorian calendar, including leap years.
Do you store my date of birth?
The calculator itself is designed to perform calculations in your browser. If analytics or advertising are added later, the privacy policy will be updated to describe those services.