Circular Economy, Recycling & Remanufacturing worked example

Closed-Loop Inventory Days with daily closed-loop consumption of 530 units / day: a worked example

This scenario runs the closed-loop inventory days calculation on the strong side: daily closed-loop consumption of 530 units / day, with every other input held at its documented default. a team needs to avoid shortages caused by slow returns, inspection holds, or variable reuse demand for a closed-loop inventory pool

The inputs for this scenario

  • Daily closed-loop consumption: 530 units / day (raised for this scenario; the documented default is 210)
  • Return, inspection, repair, or replenishment lead time: 9 days (unchanged)
  • Closed-loop safety stock: 500 units (unchanged)

Working through the calculation

  • Applying the documented formula (Loop cycle stock = daily closed-loop consumption × return, inspection, repair, or replenishment lead time) to the inputs above produces each figure below.
  • At this operating point the engine returns 0.12 units for protected days of supply, the number this scenario is built around.
  • At this operating point the engine returns 58.89 days for unprotected days.
  • At this operating point the engine returns 530 pieces for inventory.
  • At this operating point the engine returns 9 pieces / day for daily usage.

How this compares with the baseline

  • Against the tool's baseline example, where daily closed-loop consumption sits at 210 units / day and the headline result is 0.05 units, this scenario comes in 152% above the baseline at 0.12 units.
  • Use it when sizing a returnable-asset pool, core bank, or refurbished-unit float for a closed-loop replenishment system. 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: 0.12 units (headline result)
  • Unprotected days: 58.89 days
  • Inventory: 530 pieces
  • Daily usage: 9 pieces / day

Run it with your numbers

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

Last reviewed 2026-05-12.