Age calculator

Enter your date of birth and, if you like, a reference date (“as of”). You get age in calendar years, months, and days, plus total days—with your choice to include or exclude the end date in that count.

Defaults to today if left empty.
Total days count
Exclude: days from birth up to but not including “as of”. Include: add one day so both the first and last calendar days count.

How it works

Age is counted in whole calendar years, then months, then days from your birthday to the reference date. For “total days”, choose whether the “as of” day is counted: excluded means the gap in calendar days only; included means that day is part of the count (adds one day).