CMMS, EAM & Spare Parts Management worked example

Critical Spares Coverage at 99% target critical spares coverage: a worked example

This scenario runs the critical spares coverage calculation on the strong side: 99% target critical spares coverage, with every other input held at its documented default. a maintenance or asset-management team needs to close spare-parts gaps on high-criticality equipment before a failure creates extended downtime for a critical spares review

The inputs for this scenario

  • Critical assets with required spares covered: 138 count (unchanged)
  • Critical assets reviewed: 160 count (unchanged)
  • Target critical spares coverage: 99 % (raised for this scenario; the documented default is 95)

Working through the calculation

  • Applying the documented formula (Critical Spares Coverage rate = critical assets with required spares covered ÷ critical assets reviewed × 100) to the inputs above produces each figure below.
  • At this operating point the engine returns 86.25 % for critical spares coverage rate, the number this scenario is built around.
  • At this operating point the engine returns 12.75 points for critical spares coverage gap to target.
  • At this operating point the engine returns 138 count for critical assets with required spares covered.
  • At this operating point the engine returns 160 count for critical assets reviewed.

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 %.
  • Use it after a criticality ranking or spares review to measure stocking readiness and prioritize procurement. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Critical Spares Coverage rate: 86.25 % (headline result)
  • Critical Spares Coverage gap to target: 12.75 points
  • critical assets with required spares covered: 138 count
  • critical assets reviewed: 160 count

Run it with your numbers

  • Every input above is editable in the live Critical Spares Coverage calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.