Manpower Requirement Calculator
Size a team from workload and output per person, after taking out leave, absence, shrinkage and the utilisation you can realistically plan to. Planning to 100% utilisation guarantees a backlog.
Free · No sign-up · Nothing leaves your browser · Figures reviewed 22 September 2026
Your details
In whatever unit you count — tickets, calls, invoices, orders.
In the same unit.
Training, meetings, breaks, admin — time at work but not on the work.
Planning to 100% guarantees a backlog, because work does not arrive evenly.
Optional — shows the gap.
People required
28
27 before rounding.
The work
- Volume in the period
- 12,000
- Output per person a day
- 30
- Person-days of work
- 400
What a person actually gives you
- Working days in the period
- 22
- Less planned leave
- −2
- Less absence3%
- −0.7
- Less shrinkageTraining, meetings, breaks, admin
- −10%
- Target utilisationPlanning for 100% guarantees a backlog
- 85%
- Effective days per person
- 14.8
The gap between a calendar day and a productive hour is where headcount plans go wrong. Every deduction here is one people forget.
The answer
- Required headcount
- 27
- Rounded up
- 28
Planning to 100% utilisation guarantees a backlog, because arrivals are not evenly spaced. 80–85% is the usual planning figure for work that arrives unpredictably.
This sizes a steady state. Seasonal peaks need either a separate calculation for the peak period or an explicit decision to carry a backlog through it.
Dividing workload by output per person gives you person-days. Turning person-days into people is where headcount plans go wrong, because a person on the payroll is not a person at the desk.
Leave, absence, shrinkage — training, meetings, breaks, admin — and a realistic utilisation target together account for a quarter to a third of a nominal working year.
Frequently asked questions
- How do you calculate manpower requirement?
- Divide total workload by output per person per day to get person-days, then divide by the effective days one person actually delivers after leave, absence, shrinkage and your utilisation target.
- What is shrinkage in workforce planning?
- Paid time at work that is not spent on the work itself — training, meetings, breaks, system downtime, administration. Ten to fifteen per cent is common for office roles and considerably higher in contact centres.
- Why not plan for 100% utilisation?
- Because work does not arrive evenly. At 100% planned utilisation any variation in arrival becomes a backlog that never clears. Eighty to eighty-five per cent is the usual planning figure for unpredictable work.
About this tool
Built by the ViniOffice team. Figures and rules last reviewed 22 September 2026 against the statutory reference this team maintains. Indian statutory rates are date-effective and change by notification — confirm against the current one before running payroll or filing.
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