Age calculator

Client

Useful for eligibility checks, anniversaries, or quick “how old on date X” questions—all computed on your device.

Age inputs

?
Uses calendar dates in your local time zone. “As of” defaults to today.

Age: 35 years, 9 months, 30 days

Common use cases

  • Answer “how old on date X” for eligibility, school enrollment, or anniversaries.
  • Compare calendar age with Unix timestamp tools when debugging timezone boundaries.
  • Double-check DOB math before entering data into forms.

Common mistakes to avoid

  • Ignoring timezone when birth time matters

    Calendar age by date is usually fine; sub-day precision needs the same timezone rules as your system of record.

  • Using age for legal compliance without verifying jurisdiction

    Laws define age differently—confirm rules with qualified counsel when compliance matters.

FAQ

Is age computed on your servers?

No. Dates are handled locally in your browser.

Does this account for leap years?

Calendar math uses standard date arithmetic; verify edge cases if your domain requires special rules.

More tools

Related utilities you can open in another tab—mostly client-side.