The 3 Pillars of OEE and the Formula
The Comprehensive OEE Formula
OEE = Availability × Performance × Quality
- Availability: Ratio of actual operating time to planned production time (penalized by breakdowns & setups).
- Performance: Ratio of actual operating speed compared to the ideal engineering design cycle time (penalized by minor stops & slow cycles).
- Quality: Ratio of good parts produced compared to total units produced (penalized by scrap & rework).
Concrete Factory Example:
- Availability = 90.0% (0.90)
- Performance = 95.0% (0.95)
- Quality = 98.0% (0.98)
- OEE = 0.90 × 0.95 × 0.98 = 83.79%
World-Class OEE vs. Average Performance
While an 85% OEE score is considered world-class for discrete manufacturing, unmonitored factories frequently operate at 45%–55% OEE due to unrecorded micro-stops and prolonged tool changeovers. Measuring OEE systematically directs maintenance teams to the root causes of capacity loss.
Production & Plant Control
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