Elevators, Escalators & Vertical Transport Equipment worked example

Service Parts Reserve at 58% reserve coverage captured: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop reserve coverage captured to 58%, then walk the calculation through step by step. Estimate service parts reserve cost for elevator, escalator, moving walkway, or installed equipment fleets.

The inputs for this scenario

  • Covered elevator or escalator units: 240 units (held at the documented default)
  • Expected service parts cost per unit: 185 $ / unit (held at the documented default)
  • Reserve coverage captured: 58 % (the input this scenario stresses; the baseline uses 80)
  • Fixed stocking, logistics, and obsolescence cost: 4,500 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Variable service parts reserve = covered units × expected service parts cost per unit × reserve coverage captured.
  • Total service parts reserve works out to 30,252 $ at these inputs, and this is the headline figure for the scenario.
  • Reserve cost per covered unit works out to 126 $ / unit at these inputs.
  • Variable service parts reserve works out to 25,752 $ at these inputs.
  • Stocking and logistics reserve works out to 4,500 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where reserve coverage captured sits at 80% and the headline result is 40,020 $, this scenario comes in 24.41% below the baseline at 30,252 $.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to reserve coverage captured, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It uses an average expected parts cost per unit; a fleet skewed toward older or heavily-used equipment will see actual claims diverge from the modeled reserve.

Results at a glance

  • Total service parts reserve: 30,252 $ (headline result)
  • Reserve cost per covered unit: 126 $ / unit
  • Variable service parts reserve: 25,752 $
  • Stocking and logistics reserve: 4,500 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Service Parts Reserve calculator, set reserve coverage captured to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.