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Thai Calendar Calculator

Convert between Gregorian and Thai Buddhist Era (BE) calendar dates. View Thai months and holidays.

Thai Months

1. Makarakhom
2. Kumphaphan
3. Minakhom
4. Mesayon
5. Phruetsaphakhom
6. Mithunayon
7. Karakadakhom
8. Singhakhom
9. Kanyayon
10. Tulakhom
11. Phruetsachikayon
12. Thanwakhom

July 18, 2026

18 Karakadakhom 2569

๑๘ Karakadakhom ๒๕๖๙

Wan Sao

Date Details

Buddhist Era Year: 2569 BE (๒๕๖๙)

Month: Karakadakhom (7/12)

Day: 18 (๑๘)

Day of Week: Wan Sao

Thai Holidays

New YearWestern New Year
Makha BuchaBuddhist holiday (Feb full moon)
Chakri DayFounding of Chakri Dynasty
SongkranThai New Year (13-15 April)
Coronation DayKing Coronation
Visakha BuchaBuddha Day (May full moon)
Asalha BuchaDharma Day (July full moon)
Buddhist LentStart of Vassa
Queen BirthdayQueen Suthida Birthday
King BirthdayKing Vajiralongkorn Birthday
Mother DayQueen Sirikit Birthday
Chulalongkorn DayKing Rama V Memorial
Father DayKing Bhumibol Birthday
Constitution DayConstitution Day

The Thai calendar uses the Buddhist Era (BE), which is 543 years ahead of the Gregorian calendar. Thailand officially adopted the Gregorian calendar in 1940 but continues to use BE for official purposes.

What Is the Thai Buddhist Era Calendar?

The Thai calendar uses the Buddhist Era (BE) year count, which runs 543 years ahead of the Gregorian calendar. To convert: BE year = CE year + 543. So the Gregorian year 2026 corresponds to Thai Buddhist Era year 2569. The Thai calendar is officially used in Thailand for all legal documents, government records, official certificates, and most everyday contexts.

Despite using a different year count, the Thai calendar follows the same month-day structure as the Gregorian calendar — the same 12 months, the same month lengths, and the same leap year rules. This means converting between Thai and Gregorian dates only requires adjusting the year number, not recalculating days or months. A Thai date of "7 มิถุนายน 2569" (7 Mithunayon 2569 BE) corresponds to June 7, 2026 CE.

The Thai month names are derived from Pali/Sanskrit roots and are different from English month names: Makarakhom (January), Kumphaphan (February), Minakhom (March), Mesayon (April), Phruetsaphakhom (May), Mithunayon (June), Karakadakhom (July), Singhakhom (August), Kanyayon (September), Tulakhom (October), Phruetsachikayon (November), and Thanwakhom (December).

Thai Buddhist Era Conversion

The conversion between Gregorian CE and Thai Buddhist Era years is simple arithmetic.

Thai BE Year

thaiYear = gregorianYear + 543; gregorianYear = thaiYear − 543

Where:

  • 543= The offset between the Buddhist Era and the Gregorian Common Era — years since the Buddha's passing (or Parinibbana) per the Theravada tradition used in Thailand
  • thaiYear= Buddhist Era year (e.g., 2569 for Gregorian 2026)
  • gregorianYear= Gregorian/Common Era year (e.g., 2026)
  • thaiMonth= Same month number as Gregorian (January = 1, December = 12) — only the year changes
  • thaiDay= Same day of month as Gregorian — only the year changes

Major Thai Public Holidays

Holiday Thai Date Gregorian Date
New Year's Day1 MakarakhomJanuary 1
Chakri Day6 MesayonApril 6
Songkran (Thai New Year)13–15 MesayonApril 13–15
National Day5 ThanwakhomDecember 5
Constitution Day10 ThanwakhomDecember 10

Some Thai holidays are based on the lunar Buddhist calendar (Makha Bucha, Visakha Bucha, Asahna Bucha) and fall on different Gregorian dates each year.

How to Use This Calculator

  1. Select a Gregorian Date: Use the date picker to choose any date.
  2. Read the Thai Date: The Buddhist Era year, Thai month name, and day are displayed.
  3. Day of Week: The Thai day name (Wan Athit = Sunday through Wan Sao = Saturday) is also shown.
  4. Holidays: If the date corresponds to a Thai national holiday, this is indicated.

Real-World Applications

Thailand uses the Buddhist Era year on all official documents — passports, birth certificates, driver's licenses, court documents, and legal contracts. Foreigners living in or doing business with Thailand frequently need to convert between Buddhist Era and Gregorian years when interpreting these documents. A passport expiring "25/11/2567" expires on November 25, 2024 (2567 − 543 = 2024).

Financial professionals working with Thai banks, the Stock Exchange of Thailand (SET), and Thai government bond markets encounter Buddhist Era dates on statements, contract notes, and regulatory filings. Bloomberg and Reuters terminals often show Thai securities information with both CE and BE dates — understanding the conversion is a basic requirement for Thai financial market participation.

Developers building applications for the Thai market must implement Buddhist Era date handling. Thai government APIs, tax filing portals, and banking systems return dates in BE format. Proper handling ensures dates are displayed correctly to Thai users, who expect to see 2569 for the current year rather than 2026.

Worked Examples

Convert Thai BE Date to Gregorian

Problem:

A Thai document is dated 15 Thanwakhom 2567. What Gregorian date is this?

Solution Steps:

  1. 1Thanwakhom = December (12th month)
  2. 2Day: 15
  3. 3CE year = 2567 − 543 = 2024
  4. 4Gregorian date: December 15, 2024

Result:

15 Thanwakhom 2567 BE = December 15, 2024 CE

Current Thai Year

Problem:

What Thai Buddhist Era year corresponds to 2026?

Solution Steps:

  1. 1Thai BE = Gregorian CE + 543
  2. 22026 + 543 = 2569
  3. 3Buddhist Era year 2569

Result:

Gregorian year 2026 CE = Thai Buddhist Era year 2569 BE

Songkran Date in Thai Calendar

Problem:

Express April 13, 2026 in Thai calendar notation.

Solution Steps:

  1. 1Day: 13
  2. 2Month: April → Mesayon (4th month)
  3. 3CE year 2026 → BE year = 2026 + 543 = 2569
  4. 4Thai notation: 13 เมษายน 2569 (13 Mesayon 2569)
  5. 5This is Songkran — Thai New Year festival

Result:

April 13, 2026 = 13 Mesayon 2569 BE (Songkran Day)

Tips & Best Practices

  • ✓Simple conversion: Thai BE year = CE year + 543 — no exceptions.
  • ✓Thai passports and IDs use BE years — a passport expiring '2567' expires in 2024 CE.
  • ✓Songkran (Thai New Year) is April 13–15 every year — one of Thailand's most significant public holidays.
  • ✓Thai government APIs often return BE years — add the 543 offset when parsing dates from Thai government data.
  • ✓The Stock Exchange of Thailand (SET) uses CE dates in international communications but BE in domestic filings.
  • ✓When writing checks or signing contracts in Thailand, use the Buddhist Era year — CE year in official Thai documents is considered non-standard.

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Frequently Asked Questions

The Buddhist Era year count begins from the year of the Buddha's Parinibbana (passing into Nirvana), which Theravada Buddhist tradition dates to 543 BCE. This means the Buddhist Era year 1 corresponds to 543 BCE, making the current Gregorian year 2026 correspond to Buddhist Era year 2026 + 543 = 2569. Different Buddhist traditions use different base years (some use 544 BCE or 483 BCE), but Thailand follows the Theravada +543 convention.
Thailand officially uses the Buddhist Era for most civil purposes — official documents, legal contracts, government publications, and everyday life. However, Thailand also uses CE dates in international contexts, on export documents, and in financial instruments traded internationally. Most Thais are familiar with both systems and can convert instantly. Since 2007, Thai government websites have included CE year in addition to BE year on official documents.
Songkran (สงกรานต์) is the traditional Thai New Year festival, observed April 13–15 each year. It marks the movement of the sun into Aries (the astrological new year) and is celebrated with elaborate water-throwing festivities — originally a symbolic cleansing ritual where younger people poured water over elders' hands as a sign of respect and blessing. Songkran is one of Thailand's most important holidays and is a major domestic and international tourism event.
Yes — the +543 offset is constant and applies to all Gregorian years. There is no exception for centuries, leap years, or any other special case. The conversion is purely additive: CE year + 543 = BE year, and BE year − 543 = CE year. This simplicity (compared to, say, the Islamic or Hebrew calendars) makes Thai date conversion one of the easiest cross-calendar conversions.
In addition to the solar calendar for civil purposes, Thailand uses the traditional lunar calendar for scheduling Buddhist holidays. Makha Bucha (full moon of the 3rd lunar month), Visakha Bucha (full moon of the 6th lunar month), and Asahna Bucha (full moon of the 8th lunar month) are major Buddhist holidays that fall on different Gregorian dates each year based on the lunar calendar. These are national public holidays in Thailand — banks and government offices close.

Sources & References

Last updated: 2026-06-06

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Editorial Note

MyCalcBuddy Editorial Team

This page is maintained as an educational calculator reference.

Source

Formula Source: Standard Mathematical References

by Various

UpdatedLast reviewed: May 2026
CheckedFormula checks are based on standard references and internal QA review.

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