Free HR calculator
Shift Staffing Calculator
See how many employees you need to cover your shifts, accounting for vacation, holidays, sick time, and training. Get an estimated headcount and relief factor for your schedule.
About this calculator
What to expect You will need your operating schedule, positions to cover, shift length, and estimated time off. The calculation takes about two minutes.
Your staffing schedule
Employee time off and availability
Estimated employees needed
Review your coverage needs
Email your results
Email yourself a copy of your staffing estimate and inputs.
How the calculation works
How shift staffing and the relief factor work
A position may need coverage every day, even though individual employees work fewer days. The relief factor accounts for regular days off, vacation, holidays, sick time, and training to estimate how many employees are needed to cover the position.
See the calculation
How the relief factor is calculated
Annual coverage hours are calculated by multiplying hours per day by days per week and 52 weeks. A position staffed 24 hours a day, seven days a week requires 8,736 hours using that method, or 8,760 hours across 365 days. Subtract time off from annual paid hours to find each employee's available hours. Divide annual coverage hours per position by available hours per employee to calculate the relief factor. Multiply that factor by the number of positions and round up to estimate headcount. Review breaks, skills, and shift availability separately.
Why six daily shift slots can require ten employees
Two positions across three eight-hour shifts create six daily shift slots. Running those shifts every day also requires coverage for regular days off and leave. With the starting assumptions, the estimate is about ten employees. Use that estimate to plan coverage and identify where overtime may be needed.
Refine the estimate with your time-off figures
An eight-hour shift staffed seven days a week needs 56 hours of coverage. With a 40-hour employee and no time off, the relief factor is 1.4. At the starting time-off assumptions, it rises to about 1.65. Use your leave records and training schedules to refine the estimate.
Coverage across your operation
Plan staffing across every position
The Shift Staffing Planner brings your positions and schedules together in one workbook. Enter employee availability once. The workbook calculates staffing for each position, rounds each position to whole employees, and shows your total headcount.
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Compare this estimate with your records to help plan your next step.