24/7 operations
Calculate continuous coverage for production, care, control rooms or security services.
Free staffing needs calculator
How many employees does my shift operation need?
Calculate staffing needs from opening hours, shifts, minimum coverage, weekly hours and absence rate. Instant, transparent and without registration.
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Calculate staffing needs for a typical week
Opening hours · Minimum coverage · Absence reserveInputs
days
hrs
people
hrs
%
All inputs stay in your browser. The calculator processes no names or personal data.
Staffing need
Runs in your browserPlan at least
11
employees
The exact capacity need is 10.64 people for 336 weekly coverage hours including an 18% absence reserve.
- 01
168
hours/week
Operating time
- 02
336
hours/week
Required coverage
- 03
31.57
hrs per employee
Available after absence
- 04
10.64
people
Exact staffing need
Coverage in one operating week
Avg. 8.0 hrs per shift- Base need
- 8.73
- Absence reserve
- +1.92
- Shift slots/week
- 42
- Rounding buffer
- 11.27 h
Your calculation
336 hrs ÷ (38.5 hrs × 82%) = 10.64 people. The result is rounded to whole employees only in the final step.
Planning notes
- Break relief, handovers, qualifications and peak demand are not included automatically.
- The reserve is calculated through remaining availability and is included in the exact need.
- The minimum is rounded up to a whole person; the resulting extra hour capacity remains visible as a buffer.
Sources reviewed: 12 August 2026. Capacity guidance for Germany, not legal or collective-agreement advice.
Calculation explained
From opening hours to required headcount
First, weekly operating hours are multiplied by the number of employees who must be present at the same time. This produces the coverage hours your team needs to deliver each week.
The absence rate combines leave, sickness, training and other planned or unplanned absences into a capacity reserve. The calculator divides by remaining availability instead of adding a flat percentage surcharge.
The exact result is rounded up to whole people only at the end. For an actual roster, add qualifications, breaks, handovers, peaks and different contract models.
Staffing need = coverage hours ÷ (weekly hours per employee × availability rate)
For shift operations
Staffing needs for different operating models
Hospitality
Combine long opening hours, multiple shifts and a realistic absence reserve.
Retail & logistics
Estimate base coverage for sales floors, warehouses, dispatch or longer seasonal hours.
Service & support
Secure minimum coverage for reception, support, leisure services or assisted facilities.
From capacity to roster
Four factors follow the base calculation
The calculator estimates the minimum capacity you need. A robust roster then assigns that capacity to the right people and times.
- Cover qualifications and roles separately in every shift, such as a supervisor, specialist or first aider.
- Add demand peaks and fluctuating workloads on top of continuous minimum staffing.
- Plan breaks, setup time and shift handovers as additional coverage time.
- Translate full-time, part-time, marginal employment and individual availability into concrete shifts.
Turn capacity into a plan
Convert staffing needs into a workable roster
Shiftdesk connects demand, availability and qualifications in ongoing planning. See open shifts, respond to absences and keep changes transparent for the team.
Make coverage visible
See open and sufficiently staffed shifts directly in the roster.
Include qualifications
Plan the right roles and skills instead of counting heads alone.
Respond to absences
Coordinate changes, cover and availability in one place.
Get the free roster template
Transfer your staffing need into an Excel and PDF template with hour calculation and coverage check.
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FAQ
Frequently asked questions about staffing needs
How do I calculate staffing needs for shift work?
Multiply weekly operating hours by the minimum number of employees needed at the same time. Divide those coverage hours by the hours each employee is actually available. The calculator combines contract hours and absence rate for this step.
How many employees do I need for a 24/7 operation?
This mainly depends on minimum coverage, contract hours and absence rate. With two employees needed at the same time, 38.5 weekly hours and an 18 percent absence rate, the example produces about 10.64 and therefore at least 11 employees. Qualifications and peak demand may increase that number.
Which absence rate should I enter?
Use your own aggregated figures for leave, sickness, training and other absences where possible. If you do not have reliable history, treat the default as a scenario and compare several assumptions.
Why does the formula divide by availability?
With an 18 percent absence rate, only 82 percent of contracted capacity is available. Coverage hours are therefore divided by 0.82. Adding a flat 18 percent would slightly understate the need.
Are breaks and shift handovers included?
No. The input describes continuously required minimum coverage. If breaks need relief or handovers require double staffing, add those hours separately to operating or coverage planning.
Can I include part-time and marginal employees?
Yes, as an average scenario using weekly hours per employee. For mixed teams, separate calculations by contract group or a concrete roster will be more accurate.
Is the result legally binding?
No. It is capacity guidance. German working-time law, collective agreements, works agreements, qualification rules, industry requirements and individual contracts must be reviewed separately.
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