Free business calculator

Staffing Demand Probability Calculator

Estimate the chance that hourly arrivals will be more than your team can handle.

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Chance demand exceeds capacity

41.3%

3 staff can handle 9 arrivals per hour at the entered per-person capacity.

Hourly capacity: 9
Average demand: 9
Odds wording: 41.3%

Transparent breakdown

Staff working: 3
Capacity per staff: 3
Capacity gap at average: 0

Hourly demand around capacity
Arrivals	Exact chance	Capacity check
5	6.1%	Within capacity
6	9.1%	Within capacity
7	11.7%	Within capacity
8	13.2%	Within capacity
9	13.2%	Within capacity
10	11.9%	Over capacity
11	9.7%	Over capacity
12	7.3%	Over capacity
13	5%	Over capacity
14	3.2%	Over capacity

Use the result well

A clear answer, with the assumptions visible

These recommendations turn the result into an operational next step without hiding the inputs behind a score.

1
Measure demand in the busiest comparable hours.
2
Allow for breaks and work that is not in the arrival count.
3
Use a waitlist or overflow plan when overload risk matters.

How this tool works

Multiply staff by per-person capacity.
Model independent hourly arrivals with jStat’s Poisson distribution.
Calculate the chance that arrivals exceed total capacity.

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