Work-in-Process (WIP) Calculator
Calculate WIP inventory value across production stages using Little's Law and estimate carrying costs.
Inputs
units/day
days
$
%
Results
WIP Inventory Value
$25,000
WIP Units1,000 units
Annual Carrying Cost$6,250
Monthly Carrying Cost$520.83
WIP Turns per Year73
Days of Inventory5 days
Savings if Lead Time Halved$12,500
How to Use This Calculator
- Enter the average throughput rate in units per hour.
- Input the average lead time through the system in hours (Little's Law: WIP = throughput × lead time).
- Set the number of active workstations and WIP storage locations.
- Review the estimated WIP inventory count and its value at average unit cost.
- Reduce lead time or WIP limits to cut inventory cost and expose flow constraints.
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