How Many Employees Does One 24/7 Post Need in Belgium?
Holding one position every hour of 2026 in Belgium takes 8,766 staffed hours. One full-time employee is genuinely available for about 1,600 of them, so the post needs 5.48 employees, which is 6 whole people.
One ring per person, one year each
Each ring is one employee's year, broken wherever they are on holiday, on leave, or off sick. No single ring closes, which is the whole problem: one person cannot hold a post that never stops.
Stack 6 of them and the picture closes. Trace any line out from the center and it crosses at least one solid arc, so every hour of 2026 has somebody on it. That is the relief factor, drawn rather than asserted.
Where the number comes from
- 1
Staffing one position 168 hours a week comes to 8,766 hours across the year.
- 2
Belgium has 261 weekdays in the year, the starting point for one employee.
- 3
Take out 8 public holidays that fall on a weekday, 20 days of statutory paid leave, 19.5 days of average sickness absence, and 3 days of training: 50.5 days lost.
- 4
That leaves 210.5 working days per employee, and at a 38-hour week that is 7.6 hours a day, so 1,600 available hours a year.
- 5
8,766 coverage hours divided by 1,600 available hours is a relief factor of 5.48, so the post needs 6 people.
| Weekdays in the year | 261 |
| Public holidays on a weekday | −8 |
| Statutory paid annual leave | −20 |
| Average sickness absence | −19.5 |
| Training and onboarding (assumed) | −3 |
| Working days available | 210.5 |
| At 7.6 hours a day | 1,600 hours |
Paid public holidays are a statutory entitlement in Belgium, so they sit on top of annual leave and are deducted separately here.
The training allowance of 3 days is a planning assumption rather than a sourced statistic, and it is deliberately low. Every other figure on this page carries a source. If your operation runs heavy certification cycles, raise it and the relief factor rises with it.
What the usual rule of thumb gets wrong here
The common shortcut is to divide coverage hours by contracted hours and add a quarter for absence. In Belgium that gives 5.52 against a derived answer of 5.48, so the shortcut is high by 0.8 percent. A flat buffer travels badly because the things it stands in for, statutory leave and the length of the contracted week, are set nationally.
Nobody ever away. Not a real answer.
The usual shortcut, over by 0.8%.
From Belgium's own leave, hours, and absence.
Other coverage shapes
The same availability figure answers any coverage window. Only the hours the post must be staffed change.
| Coverage | Hours a week | Relief factor | People |
|---|---|---|---|
| Round the clock, every day | 168 | 5.48 | 6 |
| Round the clock, weekdays only | 120 | 3.91 | 4 |
| Two shifts, every day | 112 | 3.65 | 4 |
| Extended day, weekdays only | 60 | 1.96 | 2 |
If your contract is more generous
20 days is the statutory floor in Belgium, and most employers sit above it. Every extra week of leave is another week the post has to be covered by somebody else.
| Annual leave | Relief factor | People per post |
|---|---|---|
| 20 daysstatutory floor | 5.48 | 6 |
| 25 days | 5.61 | 6 |
| 28 days | 5.7 | 6 |
| 30 days | 5.75 | 6 |
| 33 days | 5.84 | 6 |
The inputs, and what they do not say
How the leave figure is defined
Belgian law expresses the entitlement as 4 weeks, and administers it as 24 days in the statutory 6-day regime, which converts to 20 working days on a 5-day week. It excludes the 10 legal public holidays, which are a separate entitlement under the Act of 4 January 1974. Eurofound's annual-working-time table confirms the separation by listing Belgium as 20 leave days plus 8 non-Sunday public holidays in 2022.
Why the contracted week is not the legal maximum
This page divides by a 38-hour week, the typical full-time contract in Belgium, not by the 38-hour statutory figure. The two match here, so the distinction makes no difference to the answer.
What these figures cannot be used for
Not a ranking. The sickness figure here comes from the OECD labour force survey, while most other countries in this library use a national statistical source. Those systems define absence differently, and self-reported survey figures undercount short spells that administrative records capture. Each number is the best available answer for planning inside its own country, and the gap between any two of them is partly a gap between statistical methods rather than between workforces.
A relief factor also says nothing about whether a roster is legal or humane. It sets how many people the post needs across a year; it does not check rest periods between shifts, consecutive nights, or weekend distribution. Those constraints decide whether the pattern you build on top of this headcount is one anybody can actually work.
Research notes on Belgium
LEAVE UNITS, the Belgium-specific trap. Official Belgian sources quote 24 days, not 20, because the holiday law is written in the 6-day regime. The FPS Employment posting page states "at least 24 days for 12 months of work"; that is NOT a 24-day entitlement on a normal five-day week. socialsecurity.be states both regimes explicitly: 20 days or 4 weeks on a 5-day week, 24 days or 4 weeks on a 6-day week. Use 20. Anyone copying 24 into a 5-day planner overstates leave by 20 percent. Public holidays are genuinely separate, so total paid non-working days is roughly 20 + 10 = 30, though only 8 to 10 public holidays fall on weekdays in a given year.
LEAVE ACCRUAL. Belgian statutory leave is earned in the preceding calendar year, not the current one. A full-time hire only reaches the full 20 days after a complete qualifying year, and supplementary "European" leave fills the gap only after 3 months of employment. A planner assuming 20 days for every headcount from day one will overstate absence for new hires and understate available capacity. Administration also differs between blue-collar (paid via ONVA/RJV holiday funds) and white-collar (paid by the employer).
WEEKLY HOURS. 38 is both the normal week and the ordinary weekly ceiling, in force since 1 January 2003; it is unusually low as a statutory maximum (most EU states sit at 40). Absolute ceilings are 8 hours per day (9 if the week is spread over 5.5 days or fewer), and 11 hours per day / 50 hours per week under derogations, with a 48-hour average over the reference period. The collectively agreed figure is 38.0 in Eurofound's data, identical to statutory, so there is no meaningful national gap to model. But sectors do vary below it: Eurofound reports Belgian retail at 36.7 hours in 2024 and 35 hours in parts of the chemicals sector, so 38 is the general norm rather than a universal one. The bigger scheduling trap is the opposite direction: many Belgian firms roster 40-hour weeks and grant roughly 12 compensatory rest days (ADV/RTT) per year to bring the annual average back to 38. If a roster is built on 40 hours without also modelling those rest days, capacity is overstated by about 5 percent.
SICKNESS FIGURE, read the method before using it. 19.5 days is a conversion, not a directly published day count. OECD Health Statistics 2025 publishes "sickness absences of full-time dependent employees" in WEEKS per year: Belgium = 3.9 weeks for 2025. 3.9 x 5 working days = 19.5 working days. Two caveats. First, OECD derives this from the EU Labour Force Survey and then deliberately multiplies by a factor of 2 to correct for an estimated 50 percent underreporting versus health surveys, so the raw self-reported LFS value would be about 9.8 days; the 19.5 is the OECD's corrected estimate, not a register count. Second, the series is volatile: 3.3 weeks (16.5 days) in 2022, 3.5 (17.5) in 2023, 3.6 (18.0) in 2024, 3.9 (19.5) in 2025. If you want a less jumpy planning input, the 2023-2025 mean is about 3.67 weeks, or 18.3 days. I used the most recent year as instructed.
WHY THIS DIFFERS FROM BELGIAN PRESS NUMBERS. Belgian payroll providers (SD Worx, Securex) report an absence rate around 10 percent of contract days, which on roughly 230 working days implies about 23 days. That is higher than the OECD figure because it includes long-term absence beyond 12 months, whereas the LFS-based measure largely loses people who have dropped out of active employment through long-term incapacity. Those vendor figures are HR-provider data, not official statistics, so I did not use them as a source; they are noted only as directional corroboration that 19.5 is in a plausible band and, if anything, conservative. Note also that Belgium has no waiting day: employers carry guaranteed salary for the first 30 days for white-collar staff, so short absences are entirely an employer cost.
SOURCE-QUALITY NOTE. The Eurofound figures come from its report "Working time in 2021-2022", data year 2022, because the newer October 2025 report "Balancing the clock" sits behind a bot-protection layer I could not read. Belgium's statutory 38 hours has not changed since 2003 and its 20-day minimum has not changed, so the 2022 vintage is not a material staleness risk for these two values, but it is the oldest data point in this record and worth refreshing if the newer Eurofound tables become readable.
Sources
Every figure above except the training allowance was checked against one of these.
Statutory working time: 38 effective hours per week, 8 hours per day; effective weekly working time cannot in principle exceed 40 hours
FPS Employment, Labour and Social Dialogue (Belgian federal government)2026
Statutory annual leave: "20 jours ou 4 semaines de vacances" on a 5-day week, "24 jours ou 4 semaines" on a 6-day week, full-time
socialsecurity.be, official Belgian social security portal2026
Minimum paid annual holiday: at least 24 days for 12 months of work, maximum 4 weeks per year (stated in the statutory 6-day regime)
FPS Employment, Labour and Social Dialogue (Belgian federal government)2026
Belgium: average collectively agreed normal weekly hours 38.0; gross annual hours 1,976; annual leave 20 days (statutory minimum); public holidays 8 days listed as a SEPARATE column; net annual hours 1,763. Table 1, and text: "Belgium and Italy, with 38 hours, are above the EU14 average [37.6] but still below the EU27 average of 38.1"
Sickness absences of full-time dependent employees, Belgium: 3.9 weeks per year (2025); 3.6 weeks (2024); 3.5 (2023); 3.3 (2022). Measure WKAB, unit WK_Y_PS. 3.9 weeks x 5 working days = 19.5 working days
Method for the sickness figure: "Data are expressed as the number of weeks of sickness absence per year, based on self-reported information... OECD estimates rely on the European Labour Force Survey (EU-LFS)... These estimates are then multiplied by a factor of 2 to correct for an estimated 50% underreporting"
OECD Health Statistics 2025, Definitions, Sources and Methods2025
Public holidays are a separate statutory entitlement governed by the Act of 4 January 1974 and the Royal Decree of 18 April 1974, not part of annual leave
FPS Employment, Labour and Social Dialogue (Belgian federal government)2026
Common questions
- How many people does one 24/7 position need in Belgium?
- 6 people. One position staffed every hour of the year is 8,766 hours, and one full-time employee in Belgium is actually available for about 1,600 of them once 50.5 days of holidays, leave, sickness and training come out. That is a relief factor of 5.48, which rounds up to 6 whole people.
- What is a relief factor?
- The number of employees needed to keep one position filled continuously, once the days nobody works are taken out. It is coverage hours divided by the hours one employee is genuinely available. In Belgium that is 8,766 divided by 1,600, or 5.48. A factor below the headcount you actually employ means the post runs on overtime.
- Why is a flat 25 percent absence buffer not enough for Belgium?
- Because it overshoots here. A raw hours calculation gives 4.42 employees, and adding a flat quarter takes that to 5.52, against a derived answer of 5.48. That is 0.8 percent too high, because the rule of thumb assumes more leave and sickness than Belgium actually loses.
- Does the statutory leave minimum reflect what employers actually give in Belgium?
- It is a floor, not a norm. This page computes on the statutory minimum of 20 working days because that is the figure the law fixes and a source can be attached to. Most employers sit above it, and the sensitivity table on this page shows what the relief factor becomes at more generous entitlements, so a planner can find their own contract rather than taking the floor as the answer.
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