How it is calculated
Worked example
With a 480-minute shift, 60 minutes of breaks, 47 minutes of breakdowns, a 1-second ideal cycle, 19,271 parts and 423 rejects: Availability 88.8%, Performance 86.1%, Quality 97.8% → OEE 74.8%. These are the default values above.
Practical tips
- Use the fastest cycle time the machine is designed to sustain, not the average you usually see. An optimistic average hides speed losses.
- If Performance comes out above 100%, your ideal cycle time is too slow: correct it.
- Improve the lowest of the three factors first; that is where the biggest loss in minutes usually is.
Frequently asked questions
What is a good OEE score?
About 85% is commonly treated as world class for discrete manufacturing, 60% as typical, and 40% as a frequent starting point for plants that have never measured it. Compare yourself to your own baseline before comparing to benchmarks.
Do breaks count as downtime in OEE?
No. Planned stops such as breaks, meetings or scheduled maintenance are subtracted before OEE is calculated. Only unplanned stops reduce Availability.
Where do changeovers go?
In the standard approach, changeovers and setups are unplanned stops and reduce Availability, even if they are scheduled. This makes setup reduction (SMED) visible in your OEE.
What is the difference between OEE and TEEP?
OEE uses planned production time as the base. TEEP uses all calendar time (24/7), so it also captures how much of the time the equipment is scheduled at all.