Appliance Electronics & Control Boards worked example

Appliance Control Board Service Part Buffer Calculator with service replacement boards on hand of 4,600 boards: a worked example

Push service replacement boards on hand up to 4,600 boards and the picture changes. This example computes every intermediate figure at that operating point. a service parts planner needs to size buffer inventory for appliance replacement control boards

The inputs for this scenario

  • Service replacement boards on hand: 4,600 boards (raised for this scenario; the documented default is 1,850)
  • Average daily service board usage: 72 boards/day (unchanged)
  • Demand protection safety factor: 1.35 x (unchanged)

Working through the calculation

  • Applying the documented formula (Base service board days of supply = service replacement boards on hand รท average daily service board usage) to the inputs above produces each figure below.
  • At this operating point the engine returns 47.33 days for protected service board days of supply, the number this scenario is built around.
  • At this operating point the engine returns 63.89 days for base service board days of supply.
  • At this operating point the engine returns 4,600 boards for service replacement boards on hand.
  • At this operating point the engine returns 72 boards/day for average daily service board usage.

How this compares with the baseline

  • Against the tool's baseline example, where service replacement boards on hand sits at 1,850 boards and the headline result is 19.03 days, this scenario comes in 149% above the baseline at 47.33 days.
  • It computes the protected days of supply for service replacement control boards by dividing on-hand stock by daily usage and then dividing by a demand protection safety 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

  • Protected service board days of supply: 47.33 days (headline result)
  • Base service board days of supply: 63.89 days
  • Service replacement boards on hand: 4,600 boards
  • Average daily service board usage: 72 boards/day

Run it with your numbers

  • Every input above is editable in the live Appliance Control Board Service Part Buffer Calculator calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.