Circular Economy, Recycling & Remanufacturing worked example

Reuse Inventory Days with daily reuse demand or withdrawals of 360 units / day: a worked example

Push daily reuse demand or withdrawals up to 360 units / day and the picture changes. This example computes every intermediate figure at that operating point. a team needs to set buffer stock for reusable assets or recovered components for a reuse stock point

The inputs for this scenario

  • Daily reuse demand or withdrawals: 360 units / day (raised for this scenario; the documented default is 145)
  • Reuse loop replenishment lead time: 12 days (unchanged)
  • Safety stock for return variability and quality holds: 420 units (unchanged)

Working through the calculation

  • Applying the documented formula (Loop cycle stock = daily reuse demand or withdrawals × reuse loop replenishment lead time) to the inputs above produces each figure below.
  • At this operating point the engine returns 0.07 units for protected days of supply, the number this scenario is built around.
  • At this operating point the engine returns 30 days for unprotected days.
  • At this operating point the engine returns 360 pieces for inventory.
  • At this operating point the engine returns 12 pieces / day for daily usage.

How this compares with the baseline

  • Against the tool's baseline example, where daily reuse demand or withdrawals sits at 145 units / day and the headline result is 0.03 units, this scenario comes in 148% above the baseline at 0.07 units.
  • It computes required loop inventory as cycle stock — daily reuse demand times replenishment lead time — plus a safety stock for return variability and quality holds. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Protected days of supply: 0.07 units (headline result)
  • Unprotected days: 30 days
  • Inventory: 360 pieces
  • Daily usage: 12 pieces / day

Run it with your numbers

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

Last reviewed 2026-05-12.