If you can’t measure it, you can’t improve it. Overall Equipment Effectiveness (OEE) is the industry-standard metric for identifying the percentage of planned production time that is truly productive. An OEE score of 100% represents “perfect production”: producing only good parts, as fast as possible, with zero downtime.
OEE is calculated using three underlying factors:
Availability: Measures productivity loss from downtime (events that stop production for several minutes or more).
Performance: Measures losses from “slow cycles”—factors that cause the process to run at less than its theoretical maximum speed.
Quality: Measures losses from parts that do not meet quality standards on the first pass.
The real power of OEE lies in its ability to expose “The Six Big Losses”. These losses, Unplanned Stops, Planned Stops, Small Stops, Slow Cycles, Production Rejects, and Startup Rejects – provide an actionable level of detail that helps teams target specific areas for improvement. While a “world-class” OEE score is generally considered 85% or better, the most effective approach is to set incremental stretch targets that drive meaningful progress over three to four months.
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