Dates
Age Calculator
Calculate age in years, months and days from a birth date, including total days and the next birthday.
Date of birth
Used only in this browser.
Age at date
Defaults to today.
Age
—years
Enter a birth date to calculate age.
How it works
Calendar age
The result counts completed years, then months, then the remaining days.
Total days
The total number of calendar days from birth to the selected date is shown separately.
Next birthday
The next birthday is calculated from the selected age date, not from today.
Leap years
29 February birthdays use 28 February in non-leap years.
Good to know
- The birth date stays in this browser.
- The age date defaults to today but can be changed.
- Age is calculated with calendar years, not 365-day blocks.