How does the Thai Buddhist Era relate to the Gregorian year?

The Buddhist Era (BE / พ.ศ.) is the Common Era (CE / ค.ศ.) plus 543. For example, 2026 CE is 2569 BE. Since 1941 the Thai solar calendar uses the same day and month as the Gregorian calendar, so only the year differs.

Is the conversion accurate?

Yes. For dates from 1941 onward the Thai solar calendar is identical to the Gregorian calendar except for the +543 year offset, so the conversion is exact and deterministic.

Is my date sent anywhere?

No. The converter is privacy-first — every calculation happens locally in your browser and no date ever leaves your device.

How do I convert a BE year to CE?

Subtract 543. For example, 2569 BE − 543 = 2026 CE. To go the other way, add 543 to the Gregorian year.

Do the day and month change when converting?

No. Since 1941 the Thai solar calendar shares the same day and month as the Gregorian calendar, so a date converts by changing only the year — 28 May stays 28 May.

Why is the offset 543 and not 544?

The Buddhist Era counts from the year of the Buddha's passing. Thailand's official BE-to-CE offset for the solar calendar is a fixed 543 years, which this tool applies directly.

Does this handle Thai lunar dates or festivals?

No. This converter is for the everyday Thai solar (Suriyakati) calendar. Traditional lunar festival dates like Songkran's lunar reckoning are not computed here.

Thai Buddhist Date Converter (BE ⇄ CE)

Thai Buddhist date converter

This converter translates between Gregorian (CE / ค.ศ.) dates and the Thai Buddhist Era (BE / พ.ศ.) used on official Thai documents, IDs and signage. It is for anyone reading a Thai date, filling in a form, or checking a birth year against the Western calendar.

How it works

Since 1941 the Thai solar calendar (Suriyakati) shares the same day and month as the Gregorian calendar; only the year differs, by a fixed offset:

Buddhist Era (BE) = Common Era (CE) + 543
Common Era (CE)   = Buddhist Era (BE) − 543

So converting a date changes only the year — the day and month stay exactly as entered. The conversion is pure arithmetic and is exact for any date from 1941 onward.

Example

A Gregorian date of 28 May 2026 converts to 28 พฤษภาคม 2569 BE (2026 + 543 = 2569). Going the other way, 1 January 2569 BE becomes 1 January 2026 CE (2569 − 543 = 2026).

Gregorian (CE)	Thai Buddhist (BE)
2000	2543
2026	2569
2030	2573

It is privacy-first: all processing happens locally in your browser and nothing is ever sent anywhere.