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Free staffing calculator
Estimate how many employees a shift needs from workload, output per labor hour and productive time. Free staffing calculator with a formula and worked example.
How many people does the shift need?
How many employees do I need for a shift?
Divide the required output by the output one person can complete in the same period, then round up. Use the calculator above to compare that estimate with the people assigned.
Staffing formula
People needed = round up [demand ÷ (output per productive labor hour × paid hours per person × productive-time fraction)].
Worked example: packing 1,000 units
Fictional example: demand is 1,000 accepted units, the rate is 30 units per productive labor hour, each person is paid for 8 hours, and 85% of that time is productive. One person can complete 30 × 8 × 0.85 = 204 units. Divide 1,000 by 204 and round 4.90 up to 5 people. With 4 people assigned, estimated capacity is 816 units and the staffing gap is 1 person.
Choose comparable inputs
Use demand and paid hours for the same shift or period. Enter output per person’s productive labor hour, not a whole line’s hourly output. For different products or tasks, estimate each comparable workload separately. Do not reduce time twice: if your rate already includes breaks and delays, use 100% productive time or convert the rate to a productive-hour basis.
Does this replace a staffing plan?
No. This estimates workload capacity for repeatable work. Check skill coverage, minimum crew sizes, shared operators, bottlenecks, demand peaks and absence coverage separately before deciding how many people to schedule.