Date difference
Count the days and weeks between two dates.
Everyday tools
Everyday tools · FREE ONLINE TOOL
Age calculator
Calculate completed years, months, and days.
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How to use Age calculator
Calculate the interval from a birth date to a reference date in completed years, months, and days. The reference can be today or another date after birth. The calculator also shows total days and handles month lengths using calendar dates. It is a practical date calculation rather than a determination of legal age.
01
Enter the birth date
Choose a valid calendar date.
02
Set the reference date
Use today or another date on or after the birth date.
03
Calculate the interval
Read the completed years, months, days, and total-day result.
COMMON QUESTIONS
Age calculator: useful answers
Can I calculate age on a future date?
Yes. Set a reference date on or after the birth date to calculate the calendar interval for that date.
How are short months handled?
Month anniversaries use the last available day when a month does not contain the birth day number. Leap years and month lengths are included.