Time Utilities

Age Calculator

Calculate age from birth date in years, days, or hours.

What is Age Calculator?

Age calculator computes exact age from a birth date, showing years, months, and days.

Features

  • Exact age in years, months, days
  • Total days lived
  • Next birthday countdown

Use Cases

  • Personal age tracking
  • Form validation
  • Birthday reminders

Frequently Asked Questions

What is the difference between full age and traditional counting?
Full age (周岁) counts completed years since birth — what law, medicine, and documents use; traditional East Asian reckoning (虚岁) starts at 1 and adds at the new year. The tool computes full age precisely to the day, plus a countdown to the next birthday — use it for forms and applications.
How are birthdays on February 29 handled?
Convention treats March 1 (or February 28) as the birthday in common years, with jurisdictions differing. The tool resolves the next birthday against the actual calendar year, while total-days math is unaffected.
Does the birth timezone change the result?
This tool works on dates without time-of-day or timezone — the right model for birthdays, tenure, and anniversaries. For hour-precise "alive for" durations, use the timestamp tool instead.