Maintenance & Reliability worked example

Downtime Cost per Event with downtime hours for the event of 3 hr: a worked example

This worked example runs the downtime cost per event numbers for a tougher week than the baseline: downtime hours for the event of 3 hr instead of the typical 6 hr. Calculate the total cost of one downtime event from outage duration, hourly loss, repair spend, and ramp-up or penalty cost.

The inputs for this scenario

  • Downtime hours for the event: 3 hr (the input this scenario stresses; the baseline uses 6)
  • Downtime cost per hour: 11,200 $ / hr (held at the documented default)
  • Repair parts and labor cost: 8,500 $ (held at the documented default)
  • Ramp-up loss and penalty cost: 5,500 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Event downtime loss = downtime hours for the event × downtime cost per hour.
  • Downtime Event Cost works out to 47,600 $ / event at these inputs, and this is the headline figure for the scenario.
  • Cost per Downtime Hour works out to 15,867 $ / hr at these inputs.
  • Event Downtime Loss works out to 33,600 $ at these inputs.
  • Repair and Recovery Cost works out to 14,000 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where downtime hours for the event sits at 6 hr and the headline result is 81,200 $ / event, this scenario comes in 41.38% below the baseline at 47,600 $ / event.
  • Use it after an unplanned stoppage to justify a corrective action, or in advance to model the worst-case cost of a known single point of failure. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Downtime Event Cost: 47,600 $ / event (headline result)
  • Cost per Downtime Hour: 15,867 $ / hr
  • Event Downtime Loss: 33,600 $
  • Repair and Recovery Cost: 14,000 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Downtime Cost per Event calculator, set downtime hours for the event to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.