Wood & Paper Manufacturing worked example

Roll Stock Inventory Days with roll stock on hand of 3,000 units / day: a worked example

This scenario runs the roll stock inventory days calculation on the strong side: roll stock on hand of 3,000 units / day, with every other input held at its documented default. Use it when roll stock inventory days in wood and paper manufacturing is being sized for a buffer or safety stock review.

The inputs for this scenario

  • Roll stock on hand (pieces): 3,000 units / day (raised for this scenario; the documented default is 1,200)
  • Roll stock daily consumption at the corrugator: 85 days (unchanged)
  • Safety stock factor for supply variability: 1.1 units (unchanged)

Working through the calculation

  • Applying the documented formula (Roll stock inventory days cycle stock = roll stock inventory days daily usage × roll stock inventory days lead time) to the inputs above produces each figure below.
  • At this operating point the engine returns 32.09 days for protected days of supply, the number this scenario is built around.
  • At this operating point the engine returns 35.29 days for unprotected days.
  • At this operating point the engine returns 3,000 pieces for inventory.
  • At this operating point the engine returns 85 pieces / day for daily usage.

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 150% above the baseline at 32.09 days.
  • Use it at reorder-point reviews, before a mill shutdown, or when consumption shifts with a new order mix. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Protected days of supply: 32.09 days (headline result)
  • Unprotected days: 35.29 days
  • Inventory: 3,000 pieces
  • Daily usage: 85 pieces / day

Run it with your numbers

  • Every input above is editable in the live Roll Stock Inventory Days calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.