Estimate average people required in a shift window from workload hours and productive hours per person.
Shift Headcount Calculator
Formula
Average headcount = workload hours ÷ productive hours per person
How to use the result
Round-up arithmetic does not determine lawful staffing, break relief, safety coverage or qualified-role requirements.
What the calculator does not know
These are operational arithmetic tools, not employment-law, collective-agreement, payroll, occupational-safety or human-resources advice. Breaks, rest periods, overtime, maximum hours, scheduling notice, minimum staffing and qualifications vary by jurisdiction, contract, sector and workplace; verify the rules that actually apply.
Improve the estimate
Keep the inputs used for the decision and compare the estimate with actual results. A simple calculator is most useful when it makes the assumptions visible enough to learn from the difference.