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Age calculator

Calculate age at a chosen date, birthday progress and days until the next anniversary.

Age at your chosen date26 years

+ 190 days since the last anniversary

Calendar days since birth9686
Next birthday2027-02-28

175 days until 2027-02-28

YYYY-MM-DD
Calculate age on this date
Processed on your device

How it works & useful details

How it works & limits

Age is completed anniversaries plus calendar days since the last anniversary, measured at the explicit reference date. For February 29 birthdays, choose February 28 or March 1 in non-leap years. This is a calculation convention, not a jurisdiction’s legal-age rule.

The next birthday is strictly after the reference date; a birthday on that date is shown separately. Years 0001–9999 are supported. Use today fills the device’s local calendar date only when clicked.

Your working space

Explore the live preview, then save a copyable text report. Inputs stay on this device and are cleared by refreshing. Dates use the Gregorian calendar, including before its historical introduction.