Maintenance & Reliability worked example

Spare Parts Stockout Risk with downtime severity if part is unavailable of 23 score: a worked example

This scenario runs the spare parts stockout risk calculation on the strong side: downtime severity if part is unavailable of 23 score, with every other input held at its documented default. Use it during storeroom criticality review to rank which missing parts would hurt the plant most.

The inputs for this scenario

  • Downtime severity if part is unavailable: 23 score (raised for this scenario; the documented default is 9)
  • Likelihood of a stockout occurring: 6 score (unchanged)
  • Difficulty of detecting low stock early: 7 score (unchanged)

Working through the calculation

  • Applying the documented formula (Risk score is a weighted combination of downtime severity, stockout likelihood, and detection difficulty) to the inputs above produces each figure below.
  • At this operating point the engine returns 13.05 score for stockout risk score, the number this scenario is built around.
  • At this operating point the engine returns 23 score for downtime severity.
  • At this operating point the engine returns 6 score for stockout likelihood.
  • At this operating point the engine returns 7 score for detection difficulty.

How this compares with the baseline

  • Against the tool's baseline example, where downtime severity if part is unavailable sits at 9 score and the headline result is 7.45 score, this scenario comes in 75.17% above the baseline at 13.05 score.
  • Use it when building or auditing a critical-spares list, after a stockout-driven downtime event, or during a storeroom rationalization project. 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

  • Stockout Risk Score: 13.05 score (headline result)
  • Downtime Severity: 23 score
  • Stockout Likelihood: 6 score
  • Detection Difficulty: 7 score

Run it with your numbers

  • Every input above is editable in the live Spare Parts Stockout Risk calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.