CMMS, EAM & Spare Parts Management worked example

Spare Part Reorder Point at 150% service-level and safety-stock factor: a worked example

Push service-level and safety-stock factor up to 150% and the picture changes. This example computes every intermediate figure at that operating point. a maintenance or asset-management team needs to trigger replenishment before stockouts affect corrective maintenance or PM execution for a reorder point review

The inputs for this scenario

  • average spare part demand per day: 2.4 parts / day (unchanged)
  • supplier lead time: 28 cycles (unchanged)
  • service-level and safety-stock factor: 150 % (raised for this scenario; the documented default is 130)
  • inventory accuracy confidence: 96 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross spare part reorder point = average spare part demand per day × supplier lead time) to the inputs above produces each figure below.
  • At this operating point the engine returns 96.45 units for usable spare part reorder point, the number this scenario is built around.
  • At this operating point the engine returns 67.2 units for gross spare part reorder point.
  • At this operating point the engine returns -33.26 units for spare part reorder point loss from availability or service-factor limits.
  • At this operating point the engine returns 4.02 units for spare part reorder point loss from data, accuracy, or acceptance gaps.

How this compares with the baseline

  • Against the tool's baseline example, where service-level and safety-stock factor sits at 130% and the headline result is 83.87 units, this scenario comes in 15% above the baseline at 96.45 units.
  • It computes a usable reorder point by multiplying demand-over-lead-time by a service-level factor and an inventory accuracy confidence factor. 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

  • Usable spare part reorder point: 96.45 units (headline result)
  • Gross spare part reorder point: 67.2 units
  • Spare Part Reorder Point loss from availability or service-factor limits: -33.26 units
  • Spare Part Reorder Point loss from data, accuracy, or acceptance gaps: 4.02 units

Run it with your numbers

  • Every input above is editable in the live Spare Part Reorder Point calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.