ERP & MRP Planning worked example

Manufacturing Reorder Point with lead-time demand of 2,100 units: a worked example

Push lead-time demand up to 2,100 units and the picture changes. This example computes every intermediate figure at that operating point. an inventory planner needs a defensible reorder point for an ERP item master

The inputs for this scenario

  • Lead-time demand: 2,100 units (raised for this scenario; the documented default is 820)
  • Safety stock quantity: 180 units (unchanged)
  • Minimum order or pack reserve: 100 units (unchanged)
  • Quality hold or allocation reserve: 60 units (unchanged)

Working through the calculation

  • Applying the documented formula (Manufacturing reorder point = lead-time demand + safety stock + order-policy reserve + quality/allocation reserve) to the inputs above produces each figure below.
  • At this operating point the engine returns 2,440 units for manufacturing reorder point, the number this scenario is built around.
  • At this operating point the engine returns 2,100 units for lead-time demand.
  • At this operating point the engine returns 180 units for safety stock quantity.
  • At this operating point the engine returns 160 units for policy and quality reserves.

How this compares with the baseline

  • Against the tool's baseline example, where lead-time demand sits at 820 units and the headline result is 1,160 units, this scenario comes in 110% above the baseline at 2,440 units.
  • It sums lead-time demand, safety stock, order-policy reserve, and quality/allocation reserve into a single reorder trigger in units. 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

  • Manufacturing reorder point: 2,440 units (headline result)
  • Lead-time demand: 2,100 units
  • Safety stock quantity: 180 units
  • Policy and quality reserves: 160 units

Run it with your numbers

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

Last reviewed 2026-05-12.