OEE & Factory Performance worked example

Changeover Loss for OEE with changeovers in the period of 30 changeovers: a worked example

What does the result look like when changeovers in the period reaches 30 changeovers? The full calculation is worked below with real intermediate numbers. Use it to size the SMED/quick-changeover opportunity in OEE & Factory Performance.

The inputs for this scenario

  • Changeovers in the period: 30 changeovers (raised for this scenario; the documented default is 12)
  • Average changeover time: 35 min (unchanged)
  • Planned production time: 9,600 min (unchanged)

Working through the calculation

  • Applying the documented formula (Changeover loss = changeovers × average changeover time) to the inputs above produces each figure below.
  • At this operating point the engine returns 17.5 hr for changeover loss, the number this scenario is built around.
  • At this operating point the engine returns 10.94 % of planned for availability loss.
  • At this operating point the engine returns 1,050 min for changeover time.
  • At this operating point the engine returns 30 changeovers for changeovers.

How this compares with the baseline

  • Against the tool's baseline example, where changeovers in the period sits at 12 changeovers and the headline result is 7 hr, this scenario comes in 150% above the baseline at 17.5 hr.
  • A figure at this level is achievable when changeovers in the period is genuinely sustained, not just peaked for a shift. It uses an average changeover time, so it hides the long-tail set-ups that often cause the most schedule damage, and it assumes every changeover is unavoidable rather than a candidate for elimination through sequencing.

Results at a glance

  • Changeover loss: 17.5 hr (headline result)
  • Availability loss: 10.94 % of planned
  • Changeover time: 1,050 min
  • Changeovers: 30 changeovers

Run it with your numbers

  • Every input above is editable in the live Changeover Loss for OEE calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.