Buddhist Era converter

BE, the calendar 200 million people use you've barely heard of

Buddhist Era is the official civil calendar in Thailand and one of two legal calendars in Laos, Cambodia, and Sri Lanka. Add in informal use across Myanmar and the Theravada diaspora and you are well past 200 million daily users. It runs in parallel with the Gregorian calendar, bank receipts in Bangkok show both, but newspapers and government forms still default to BE.

Why Thai stores wrote year 2569 in 2026

The Thai BE offset is 543. The era counts from the traditional date of the Buddha's parinirvana, so 2026 CE maps to 2569 BE. Lao tradition uses the same arithmetic. Khmer and Sri Lankan traditions add one, 2570 BE, because their year rolls earlier in the cycle (Khmer New Year in April, Vesak full moon in May), so the BE count overlaps the Gregorian year differently.

Songkran isn't the same day across SEA

The water-festival weekend (April 13-15) is the conventional Thai date and a public holiday block. Lao Pi Mai runs in the same window. Khmer New Year (Choul Chnam Thmey) is tied to the sun entering Aries, usually April 13 or 14, and is also when the Khmer BE year increments. In Sri Lanka the Sinhala and Tamil New Year (Aluth Avurudda) lands in the same window but the BE year itself rolls later, on the Vesak full moon in May.

The four reckonings side by side

Because the +544 traditions roll over mid-year, they match the Thai count during the early months of a Gregorian year and sit one year ahead after their own new year passes. Pick the tradition first, then convert: the same Gregorian date can carry two different BE years depending on that choice.

Run 2026 through the tool as a test case

Take 20 April 2026. Thai and Lao reckonings return 2569 BE, since their year rolled on January 1 and the arithmetic simply adds 543. Khmer reckoning returns 2570 BE because Khmer New Year has already passed in mid-April. Sri Lankan reckoning still says 2569 BE, because its year waits for the Vesak full moon, which falls on 1 May in 2026. Convert 2 May 2026 and the Sri Lankan count joins Khmer at 2570, while Thai and Lao stay at 2569 through 31 December.

Festival dates rest on a full-moon table

Vesak, Asalha Puja, and Loy Krathong track the full moon rather than a fixed Gregorian day, so the tool reads them from a precomputed table of full-moon dates covering 2020 to 2035. For 2026 that gives Vesak on 1 May, Asalha Puja on 29 July, and Loy Krathong on 24 November, with Songkran holding its conventional 13 to 15 April window. Public-holiday gazettes in each country occasionally observe a festival on an adjacent day, so verify against official announcements before booking travel or planning around a closure.

Spotting BE years on real documents

Thai packaging, licences, and receipts routinely print years in BE, which trips up visitors reading expiry dates. A Thai label showing 2570 means 2027 CE, not a date decades away: subtract 543 to recover the Gregorian year. Going the other way, add 543 when filling Thai forms that expect BE. For Cambodian or Sri Lankan ceremonial dates, remember the offset is 544 once their new year has passed, so a blind subtraction of 543 can leave you a year off.

Common questions