Planning worked example

Reorder Point with daily demand of 73 units / day: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop daily demand to 73 units / day, then walk the calculation through step by step. Calculate reorder point from daily demand, lead time, safety stock, and current inventory.

The inputs for this scenario

  • Daily demand: 73 units / day (the input this scenario stresses; the baseline uses 145)
  • Lead time: 9 days (held at the documented default)
  • Safety stock: 420 units (held at the documented default)
  • Current inventory: 2,100 units (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Lead-time demand = daily demand × lead time.
  • Reorder point works out to 1,077 units at these inputs, and this is the headline figure for the scenario.
  • Lead-time demand works out to 657 units at these inputs.
  • Inventory gap works out to 1,023 units at these inputs.
  • Days until reorder works out to 14.01 days at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where daily demand sits at 145 units / day and the headline result is 1,725 units, this scenario comes in 37.57% below the baseline at 1,077 units.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to daily demand, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It assumes constant daily demand and a fixed lead time; if either varies significantly, the fixed safety stock here may not give the service level you need.

Results at a glance

  • Reorder point: 1,077 units (headline result)
  • Lead-time demand: 657 units
  • Inventory gap: 1,023 units
  • Days until reorder: 14.01 days

Run it with your numbers

  • To rerun this with your own numbers, open the live Reorder Point calculator, set daily demand to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.