Thailand Working Days Calculator
Count Thai working days with all national public holidays excluded — for project timelines, supplier lead times, and delivery windows across Thailand.
Count working days in Thailand between any two dates — national public holidays excluded.
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Covers Thai national public holidays. Buddhist lunar holidays (Makha Bucha, Visakha Bucha, Asalha Bucha, Buddhist Lent Day) are from approximate annual override tables — verify with official Thai government announcements. Royal birthday and memorial holidays are fixed dates.
Formula
Working Days = Weekdays − National public holidays falling on weekdays
Count all Monday–Friday days in the range, then subtract any Thai national public holidays that fall on those weekdays. When a public holiday falls on a weekend, Thailand sometimes observes a substitute weekday holiday — these substitutions are announced by the Cabinet and are not universally applied across all sectors. This calculator uses the declared statutory holiday dates only.
Worked Example
Scenario: A Bangkok supplier quotes a 10 working day lead time starting Monday 7 April 2025.
Within this window: Songkran (13–15 April) falls across Sunday, Monday, and Tuesday — that is 2 weekday holidays (14 and 15 April). Chakri Day (6 April) falls on Sunday, so no weekday deduction.
10 working days + 2 weekday holidays (14–15 April) = 12 weekdays forward
Result: deadline falls on ~23 April 2025
The Songkran period (Thai New Year, 13–15 April) is one of the busiest travel periods in Thailand. Many businesses, especially smaller manufacturers and trading companies, shut for a full week. Always verify production schedules directly for any deadline spanning mid-April.
Common Mistakes
- Underestimating the Songkran shutdown. Songkran (13–15 April) is the Thai New Year and one of the most commercially significant holiday periods. The three statutory public holidays are frequently extended by informal closures, with many businesses shutting for a full week. Never schedule critical production or shipping deadlines around mid-April without confirming directly with your Thai counterpart.
- Missing lunar calendar holidays. Four of Thailand's public holidays follow the Buddhist lunar calendar: Makha Bucha, Visakha Bucha, Asalha Bucha, and Buddhist Lent Day (Khao Phansa). Their Gregorian dates shift by roughly 10–11 days each year. Always confirm the current year's dates from the official Thai government calendar.
- Ignoring substitute holidays. When a statutory public holiday falls on a weekend, the Thai Cabinet typically declares a substitute weekday holiday (usually the following Monday). These substitutions are announced officially but can vary year to year and are sometimes not applied across all sectors. Check the official Royal Thai Government Gazette for any given year's substitutions.
Guide
How to Use
- 1
Enter start and end dates
Select the period you want to measure. Both dates are inclusive in the count.
- 2
Click Calculate
The tool counts Monday–Friday days and deducts Thailand's national public holidays for the selected year.
- 3
Review excluded holidays
The result shows working days and names any public holidays that fell within the range.
- 4
Check for Songkran and extended closures
For any deadline near Songkran (mid-April), confirm directly with your Thai counterpart whether they observe additional informal closure days beyond the three statutory holidays.
FAQ