Belgium Working Days Calculator
Count working days in Belgium (werkdagen / jours ouvrés) between any two dates — all 10 national holidays excluded for 2026. Covers Belgian National Day (21 Jul), Armistice Day (11 Nov), New Year, Easter Monday, Labour Day, Ascension, Whit Monday, Assumption, All Saints, and Christmas. Accurate for Belgian B2B contracts, EU Late Payment Directive deadlines, and cross-border SLA tracking with France, Germany, and Netherlands.
Count werkdagen in Belgium between any two dates — all 10 national public holidays excluded.
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Covers Belgium's 10 national public holidays. Easter Monday and Ascension/Whit Monday are computed algorithmically for any year. Community holidays (11 July in Flanders, 27 September in the French Community, 15 November in the German Community) are not included.
Formula
Working Days = Weekdays − National public holidays falling on weekdays
Count all Monday–Friday days in the range, then subtract any of Belgium's national public holidays that fall on those weekdays. Regional community holidays (e.g. 11 July for Flanders) are not included.
Worked Example
Scenario: A Brussels-based supplier quotes a 15 working day delivery window starting Monday 14 July 2025.
Belgian National Day falls on Monday 21 July 2025 — a weekday — and counts as one excluded holiday.
15 working days + 1 national holiday = 16 weekdays forward
Result: deadline falls on ~5 August 2025
If your Brussels supplier is Flemish-facing, also check 11 July (Flemish Community Day) — many Flemish businesses close on this date even though it is not a national holiday.
Common Mistakes
- Missing community holidays. 11 July (Flemish Community Day), 27 September (French Community Day), and 15 November (German-speaking Community Day) are not national holidays but close offices in their respective regions. Many Flemish and Walloon businesses observe these as non-working days.
- Overlooking Armistice Day (11 November). Belgium is one of the few EU countries that observes 11 November as a national holiday. This is not a public holiday in Germany, France, Spain, or the Netherlands.
- Assuming Belgian and Dutch holidays align. Despite geographic proximity and a shared language (Dutch/Flemish), Belgium and the Netherlands have different national holidays. Belgian National Day (21 July) does not exist in the Netherlands.
Guide
How to Use
- 1
Enter start and end dates
Select the period you want to measure. Both dates are inclusive.
- 2
Click Calculate
The tool counts Monday–Friday days and deducts Belgium's 10 national public holidays for the selected year.
- 3
Review excluded holidays
The result shows working days and names any national holidays excluded within the range.
- 4
Add community holidays if needed
For Flemish-region counterparts, manually adjust for 11 July. For French-speaking regions, check 27 September.
Next Steps
What to do next
FAQ
Frequently Asked Questions
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Working days in Belgium: werkdagen, jours ouvrés, and Arbeitstage
Belgium is a trilingual country — French, Dutch (Flemish), and German are all official languages. In Dutch, working days are werkdagen; in French, jours ouvrés; in German, Arbeitstage. All three refer to the same concept: Monday through Friday, excluding public holidays.
Belgium has 10 national public holidays per year. Unlike some neighbouring countries, Belgium does not apply a substitute day rule — if a holiday falls on a Sunday, it is not moved to Monday. This can reduce the effective holiday count in some years, making Belgium's actual working day total slightly higher than a nominal count suggests.
For cross-border EU business, the EU Late Payment Directive (2011/7/EU) is implemented in Belgium. Under the directive, public sector payment periods are generally 30 calendar days and B2B contracts default to 30 days, extendable to 60 days by explicit agreement. Working day counts can be relevant when assessing payment timelines — verify the applicable rules for your situation.
Belgian public holidays and business planning
May cluster (Labour Day + Ascension)
Labour Day (1 May) and Ascension (39 days after Easter, falling in May) can create back-to-back public holiday weeks. Combined with Easter Monday in April, Belgian businesses may have 3 public holidays within a 6-week window — significantly reducing available working days for project delivery and invoice payment planning.
Belgian National Day (21 July)
Belgian National Day on 21 July is a fixed date. When it falls mid-week, it creates a one-day gap in an otherwise full working week. For deadline calculations that span late July, this holiday must be accounted for in working day counts.
Armistice Day and All Saints (November)
Armistice Day on 11 November and All Saints' Day (1 Nov) give November two public holidays. Delivery and payment deadlines spanning November should account for both — especially if the window crosses both dates.
EU cross-border SLA and invoicing
Belgian businesses working with French, Dutch, or German counterparts must reconcile holiday calendars. Easter falls on the same date for all, but national days differ. This calculator covers Belgium specifically; for multi-country comparisons, use the Working Days Europe tool.
Need working days for neighbouring countries?
Belgium borders France, Germany, and the Netherlands. Use country-specific calculators for cross-border deadline and invoice planning.
Next Steps
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FAQ