Wood & Paper Manufacturing worked example

Roll Stock Inventory Days with roll stock on hand of 600 units / day: a worked example

This worked example runs the roll stock inventory days numbers for a tougher week than the baseline: roll stock on hand of 600 units / day instead of the typical 1,200 units / day. Estimate roll stock inventory days for wood and paper manufacturing using production-ready inputs so teams can plan replenishment and safety stock using actual usage and lead time.

The inputs for this scenario

  • Roll stock on hand (pieces): 600 units / day (the input this scenario stresses; the baseline uses 1,200)
  • Roll stock daily consumption at the corrugator: 85 days (held at the documented default)
  • Safety stock factor for supply variability: 1.1 units (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Roll stock inventory days cycle stock = roll stock inventory days daily usage × roll stock inventory days lead time.
  • Protected days of supply works out to 6.42 days at these inputs, and this is the headline figure for the scenario.
  • Unprotected days works out to 7.06 days at these inputs.
  • Inventory works out to 600 pieces at these inputs.
  • Daily usage works out to 85 pieces / day at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where roll stock on hand sits at 1,200 units / day and the headline result is 12.83 days, this scenario comes in 50% below the baseline at 6.42 days.
  • Use it at reorder-point reviews, before a mill shutdown, or when consumption shifts with a new order mix. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Protected days of supply: 6.42 days (headline result)
  • Unprotected days: 7.06 days
  • Inventory: 600 pieces
  • Daily usage: 85 pieces / day

Run it with your numbers

  • To rerun this with your own numbers, open the live Roll Stock Inventory Days calculator, set roll stock on hand to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.