How to build a staffing model

Why you need a staffing model

Without a model, schedules are built from habit: the same number of people every Tuesday, whether it is busy or not. That leads to two expensive problems at once: overstaffing on quiet shifts and understaffing at peaks, which brings overtime, slow service and burned-out employees. A staffing model replaces habit with a rule you can explain, adjust and defend.

It does not need special software. A spreadsheet with your sales or volume data and your time records is enough to start.

Step 1: measure demand

Pick the driver that best predicts how much work there is. It differs by business:

Pull at least 8 to 12 weeks of history by hour and day, plus last year’s same season. Note special events, weather and promotions that distort the pattern.

Step 2: set productivity standards

For each role, decide how much work one person can handle per hour at your service standard. Use your own data: total volume divided by total productive hours over a few normal weeks. For example, a counter employee might handle 20 transactions an hour, or a picker 90 units. Set a minimum staffing level too: the number of people you need for safety, security or opening and closing, regardless of volume.

Step 3: convert demand to labor hours

Divide expected volume by the productivity standard for each hour, round up, and apply the minimum staffing level.

Add up the hours for the day and the week. This is your productive labor requirement.

Step 4: add non-productive time

People are not productive every paid hour. Add an allowance for:

• Paid breaks, where your policy or state law requires them.
• Opening, closing, cleaning and handover tasks.
• Training and meetings.
• Expected absences, such as sick leave, PTO and call-outs. Use your own absenteeism rate.
• Travel time for field and mobile roles.

This allowance is often called shrinkage in workforce planning. If 15% of paid time is non-productive, divide productive hours by 0.85 to get scheduled hours.

Step 5: choose the right mix

Turn weekly hours into people. A mix of contract types gives stability and flexibility:

Use headcount math: weekly scheduled hours ÷ average hours per person by contract type. Keep some extra capacity, often 5 to 10% of hours, in a trained flex pool so one call-out does not break the schedule. See FTE and the staffing calculator.

Check the model against cost

Compare planned labor cost with revenue or budget. Labor cost percentage is the common check in restaurants and retail; cost per unit or per visit works for operations and services. If the model shows labor above budget, look first at the productivity standard and the shape of the schedule, such as shift start times, before cutting people at peak times.

Turn the model into a schedule

1. Build shifts that match the hourly curve, using staggered starts instead of everyone arriving at once.
2. Assign people by skill and availability, starting with core staff.
3. Check overtime, rest periods and any predictive scheduling rules.
4. Publish early and fill gaps from the flex pool.
5. Compare scheduled and actual hours each week.

Our guide on how to create an employee schedule covers the details.

Example: a small warehouse (fictional)

A regional distributor ships an average of 7,200 units a day, with Mondays about 30% busier. Pickers handle 90 units per productive hour, so an average day needs 80 productive picking hours and a Monday about 104. Breaks, the start-of-shift huddle, cleaning and absence take about 15% of paid time, so the scheduled requirement is roughly 94 hours on an average day and 122 on Mondays. Over a five-day week that is about 500 scheduled hours. The manager covers 400 hours with ten full-time pickers, adds two part-timers at 30 hours each for Mondays and Fridays, and keeps three trained on-call workers for spikes and absences. The remaining 40 or so hours are covered by the on-call workers, and overtime is reserved for unexpected surges, not built into the plan.

Roles that do not scale with volume

Some roles do not change with volume: a shift supervisor, a security guard at a fixed post, a cook who must be present while the kitchen is open. Plan these as fixed coverage first, then add variable roles on top. Also plan coverage for skills, not only heads: every shift needs someone who can open, close, handle cash or operate key equipment. A simple skills matrix shows where you depend on one person and where cross-training would help.

Review and adjust

A staffing model is a living tool. Each month, compare forecast with actual volume, scheduled with actual hours, and service measures such as wait times or order accuracy. Update productivity standards when processes or equipment change, and rebuild the seasonal forecast once a year.

Common mistakes

• Staffing to last year’s schedule instead of current demand.
• Ignoring non-productive time, which guarantees understaffing.
• Relying on overtime as a permanent part of the model.
• Using one productivity standard for every location.
• Never comparing the plan with what actually happened.

How EZTime helps

EZTime gives you the actual hours behind the model: who worked, when and on which job or location. Managers build schedules by role and location, post open shifts to a flex pool and get labor rule alerts before overtime or rest limits are crossed. Exports make it easy to compare scheduled and actual hours.

Frequently asked questions

Where to go next