OEE & Factory Performance worked example

Unplanned Downtime Ratio at 5.75% target unplanned downtime ratio: a worked example

This scenario runs the unplanned downtime ratio calculation on the strong side: 5.75% target unplanned downtime ratio, with every other input held at its documented default. Use it to track unplanned downtime ratio against target in OEE & Factory Performance.

The inputs for this scenario

  • Unplanned downtime minutes: 40 min (unchanged)
  • Total scheduled production minutes: 480 min (unchanged)
  • Target unplanned downtime ratio: 5.75 % (raised for this scenario; the documented default is 5)

Working through the calculation

  • Applying the documented formula (Unplanned downtime ratio = unplanned downtime ÷ total scheduled time × 100) to the inputs above produces each figure below.
  • At this operating point the engine returns 8.33 % for unplanned downtime ratio, the number this scenario is built around.
  • At this operating point the engine returns -2.58 points for gap to target.
  • At this operating point the engine returns 40 count for unplanned downtime.
  • At this operating point the engine returns 480 count for total scheduled time.

How this compares with the baseline

  • Against the tool's baseline example, where target unplanned downtime ratio sits at 5% and the headline result is 8.33 %, this scenario lands almost exactly on the baseline at 8.33 %.
  • Use it in reliability reviews and OEE deep-dives to quantify breakdown losses and track whether maintenance improvements are moving the number. 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

  • Unplanned downtime ratio: 8.33 % (headline result)
  • Gap to target: -2.58 points
  • Unplanned downtime: 40 count
  • Total scheduled time: 480 count

Run it with your numbers

  • Every input above is editable in the live Unplanned Downtime Ratio calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.