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Age Calculator

Free age calculator: enter a date of birth to get exact age in years, months and days, total weeks, days and hours, next birthday countdown, the weekday you were born and your Thai zodiac year. Works in CE or Buddhist Era (พ.ศ.).

Age Calculator

How to use Age Calculator

  1. 1Pick CE or BE and enter the date of birth (only the year is fine too).
  2. 2Leave “Age on” as today, or pick another date.
  3. 3Read the exact age, totals and next birthday, and copy the summary.

What it does

  • Exact age in years, months & days
  • Totals in months, weeks, days and hours
  • Next birthday countdown and weekday
  • Day of the week you were born, with its Thai colour
  • Thai zodiac year (ปีนักษัตร)
  • Enter years in CE or Buddhist Era (BE = CE + 543)

FAQ

How is the exact age calculated?
We count whole calendar years first, then whole months, then the remaining days, the same way you would on a calendar. Someone born on 31 January is one month older on the last day of February.
How do I convert a Buddhist Era (พ.ศ.) year?
Subtract 543 to get the CE year, or add 543 to go the other way: 2540 BE is 1997 CE. Switch the year type at the top and the years you've typed are converted for you.
What if I only know the year of birth?
Leave the day and month blank. You'll get the age someone turns this year (and one less before their birthday), plus their zodiac year.
What about people born on 29 February?
In years without 29 February the birthday is counted on 28 February, so the countdown and “turning” age still work every year.
How is the Thai zodiac year worked out?
By calendar year in a 12-year cycle: 2020 was ปีชวด (Rat), 2024 ปีมะโรง (Dragon). Some people start the new zodiac year at Chinese New Year or Songkran instead, so births in January to April may be counted as the previous animal.

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