Date & Time Tools

Age Calculator

Enter any date of birth and instantly see your exact age in years, months, and days — plus total days lived, weeks, next birthday countdown, and the day of the week you were born.

Instant date calculations Handles leap years & DST Browser-only — works offline

Features

  • Exact age in years, months, and days
  • Total days, weeks, and hours lived
  • Day of the week you were born
  • Countdown to next birthday
  • Age at any custom 'as of' date (past or future)
  • Star sign and birth stone info
  • Works for any date from 1900 onwards
  • No account, browser-only

How to use it

  1. Enter the date of birth using the date picker.
  2. Your exact age appears instantly.
  3. Change the 'As of' date to calculate age at any past or future date.
  4. See total days lived, birthday countdown, and more.

Use cases

  • Calculating exact age for official documents
  • Checking if someone meets an age requirement
  • Fun age statistics (days, hours) for birthdays
  • Age verification for contests or eligibility

Limitations

  • Browser processing depends on available device memory for very large inputs.
  • Tool-specific limits based on file format or browser support are noted on each tool page.
See also

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Countdown Timer

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Day of the Week

Find what day of the week any date falls on — past, present, or future. Works for any date from year 1 to 9999 — browser-only.

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Time Zone Converter

Convert time between any world time zones. Supports all IANA zones with DST awareness. Find the best meeting time — browser-based, free.

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Questions & answers

Frequently asked

Does the age calculator handle leap year birthdays?

Yes. Feb 29 birthdays are handled correctly — on non-leap years the birthday is counted as March 1.

Can I calculate age at a future date?

Yes. Change the 'As of' date to any future date and the age at that date is shown.