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Convert Buddhist Year (พ.ศ.) to Gregorian (ค.ศ.)

4 min readUpdated 5 October 2026

To convert a Buddhist Era year to the Gregorian calendar, subtract 543: พ.ศ. 2569 is 2026, and พ.ศ. 2533 is 1990. To go the other way, add 543. Date Calculator does it for you in its พ.ศ. ↔ ค.ศ. tab, for single years and for full Thai dates.

It is free, needs no sign-up and works in any browser on a phone or computer, which helps when you are filling in a visa form or reading a Thai ID card on the go. Everything is worked out on your device, so the dates you type are not sent anywhere.

Do it now with Date CalculatorFree, no sign-up, works on any device.

Step by step

  1. 1Open the พ.ศ. ↔ ค.ศ. tabOpen Date Calculator and tap พ.ศ. ↔ ค.ศ. at the top. You get three panels: Year, Full date → Thai and Thai date (พ.ศ.) → ค.ศ.
  2. 2Convert a yearIn Year, type the Buddhist year into พ.ศ. (Buddhist Era). The Gregorian year appears below it straight away. It starts on the current year, so you can see this year's pair at a glance.
  3. 3Switch direction if you need toPress Swap to turn the box into ค.ศ. (Common Era) and get the Buddhist year instead. The number you had converted carries over, so nothing needs retyping.
  4. 4Convert a full Thai dateIn Thai date (พ.ศ.) → ค.ศ., enter the Day, pick the Thai month and type the พ.ศ. year. You get the Gregorian date with its weekday, plus the ISO form (such as 2026-10-05) to copy.
  5. 5Or write a date the Thai wayIn Full date → Thai, pick a Gregorian date and copy it as Thai (long), Thai (short) or Numeric, all with the Buddhist year — handy for Thai letters and forms.

Why it is 543, with examples

The Thai solar calendar counts years from the Buddha's passing, which it places 543 years before year 1 of the Gregorian calendar. Since 1941 both calendars start the year on 1 January, so for any modern date the gap is always exactly 543.

That makes the sum the same every time: ค.ศ. = พ.ศ. − 543 and พ.ศ. = ค.ศ. + 543.

  • พ.ศ. 2569 → 2026
  • พ.ศ. 2568 → 2025
  • พ.ศ. 2543 → 2000
  • พ.ศ. 2533 → 1990
  • 1985 → พ.ศ. 2528

Tip: Quick check: a Buddhist year starting with 25 is a modern date. If a document says 2026 and you expected 2569, it is already in the Gregorian calendar.

Where you will meet Buddhist Era dates

Thai ID cards, house registration books, birth certificates, bank statements and most government letters use the Buddhist year. Overseas forms such as visa or university applications want the Gregorian year, so a birth date like 12 มีนาคม 2533 has to become 12 March 1990.

The full-date panel is the safest way to do that: it checks the date really exists, so a typo such as 31 April shows That date doesn't exist — check the day and year. instead of a wrong answer.

Thai short dates and two-digit years

Thai short dates often drop the first two digits of the year, as in 5 ต.ค. 69. That means พ.ศ. 2569, so 2026, not 1969. If you see a two-digit year next to a Thai month name, add 2500 first and then subtract 543.

Going the other way, Thai (short) in the tool gives you exactly this format, and Numeric gives the day/month/year form used on many Thai documents.

Old dates before 1941

Until 1941, the Thai year began on 1 April rather than 1 January. For historical dates from January to March before พ.ศ. 2484, documents of the time count the year one higher than the modern rule gives, so you subtract 542 instead of 543.

The tool applies the modern rule of 543 to every date, which is right for anything from 1941 onwards. For older dates in the first three months of the year, adjust by one year yourself.

More you can do with the same tool

Date Calculator also counts the days between two dates, adds or subtracts days, weeks, months or years, and works out exact age from a date of birth. When you add days, the result is shown as a long date with a Thai Buddhist-year line under it.

  • Thai Tax Estimator — Thai tax years are often written in พ.ศ.: income year 2025 is ปีภาษี 2568.
  • Invoice Maker — bilingual invoices and receipts for Thai customers.
  • Timestamp Converter — turn Unix timestamps and ISO dates into readable dates.
  • Time Zones — line up Bangkok time with other cities.

Questions people ask

What year is 2569 in English?
พ.ศ. 2569 is 2026 in the Gregorian calendar (2569 − 543). It runs from 1 January to 31 December 2026.
How do I convert a Gregorian year to a Thai year?
Add 543. For example, 2026 + 543 = พ.ศ. 2569. In the tool, press Swap in the Year panel so the box reads ค.ศ. (Common Era), then type the year.
Is the Thai year always 543 years ahead?
For every date from 1941 onwards, yes. Before 1941 the Thai year started on 1 April, so January to March dates in old documents are 542 years ahead instead.
Does the conversion change the day or month?
No. Both calendars use the same days and months; only the year number differs. 5 ตุลาคม 2569 is 5 October 2026.
Do it now with Date CalculatorFree, no sign-up, works on any device.

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