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Age Calculator

Inputs
Birth date
Birth time (optional)
As of (reference)
Time
Options
General
Feb 29 birthdays

About the Age Calculator

Enter a birth date (and time, if you like) and an “as of” date. The tool shows precise age in calendar years/months/days and totals in days/hours/minutes/seconds, plus your next birthday and common milestones. All calculations use your local timezone.

  • Include time toggles whether the hour/minute/second affect results.
  • Feb 29 policy decides which day to celebrate in non-leap years.
  • Totals are floor-based (e.g., total days = floor(ms / 86400000)).