Maintenance & Reliability worked example

Annual Downtime Cost with unplanned downtime events per year of 14 events / yr: a worked example

Suppose unplanned downtime events per year falls to 14 events / yr. This page works the full calculation at that level so you can see exactly which result moves and by how much. Annualize downtime cost from events per year, average cost per event, fixed overhead impact, and penalty exposure.

The inputs for this scenario

  • Unplanned downtime events per year: 14 events / yr (the input this scenario stresses; the baseline uses 28)
  • Average financial loss per downtime event: 42,000 $ / event (held at the documented default)
  • Annual fixed overhead absorbed during downtime: 85,000 $ (held at the documented default)
  • Annual contract penalty and lost-service exposure: 60,000 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Event-driven annual downtime loss = downtime events per year × average cost per event.
  • Annual Downtime Cost works out to 733,000 $ / yr at these inputs, and this is the headline figure for the scenario.
  • Cost per Downtime Event works out to 52,357 $ / event at these inputs.
  • Event-Driven Downtime Cost works out to 588,000 $ at these inputs.
  • Fixed Overhead and Penalty works out to 145,000 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where unplanned downtime events per year sits at 28 events / yr and the headline result is 1,321,000 $ / yr, this scenario comes in 44.51% below the baseline at 733,000 $ / yr.
  • It sums event-driven losses (events x cost per event) with fixed overhead and penalty exposure to give a fully-loaded annual downtime cost. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Annual Downtime Cost: 733,000 $ / yr (headline result)
  • Cost per Downtime Event: 52,357 $ / event
  • Event-Driven Downtime Cost: 588,000 $
  • Fixed Overhead and Penalty: 145,000 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Annual Downtime Cost calculator, set unplanned downtime events per year to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.