CMMS, EAM & Spare Parts Management worked example

Critical Spares Coverage at 68% target critical spares coverage: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop target critical spares coverage to 68%, then walk the calculation through step by step. Measure how many critical assets have the required emergency spares, repair kits, or supplier coverage documented.

The inputs for this scenario

  • Critical assets with required spares covered: 138 count (held at the documented default)
  • Critical assets reviewed: 160 count (held at the documented default)
  • Target critical spares coverage: 68 % (the input this scenario stresses; the baseline uses 95)

Working through the calculation

  • The calculation starts from the formula this tool documents: Critical Spares Coverage rate = critical assets with required spares covered ÷ critical assets reviewed × 100.
  • Critical Spares Coverage rate works out to 86.25 % at these inputs, and this is the headline figure for the scenario.
  • Critical Spares Coverage gap to target works out to -18.25 points at these inputs.
  • critical assets with required spares covered works out to 138 count at these inputs.
  • critical assets reviewed works out to 160 count at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where target critical spares coverage sits at 95% and the headline result is 86.25 %, this scenario lands almost exactly on the baseline at 86.25 %.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to target critical spares coverage, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. Coverage counts whether a spare is stocked, not whether the quantity, condition, or shelf life is adequate — a covered asset can still face a stockout if it needs two of a part you stock only one of.

Results at a glance

  • Critical Spares Coverage rate: 86.25 % (headline result)
  • Critical Spares Coverage gap to target: -18.25 points
  • critical assets with required spares covered: 138 count
  • critical assets reviewed: 160 count

Run it with your numbers

  • To rerun this with your own numbers, open the live Critical Spares Coverage calculator, set target critical spares coverage to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.