Age Calculator from Date of Birth

The tool compares the birth date and reference date at local noon, counting complete years first, then months and days. If the birthday has not occurred yet in the reference year, one year is subtracted.

February 29 birthdays use February 28 in non-leap years, so the countdown and age stay accurate without manual tweaks.

Change the reference date to view your age in the past or future. Leave it blank to default to today.