Full definition
The gold-standard manufacturing productivity metric that measures how effectively a machine or production line is utilized, combining three factors: OEE = Availability × Performance × Quality. (1) Availability = (Run Time) / (Planned Production Time) — accounts for unplanned stops (breakdowns) and planned stops (changeovers, maintenance). (2) Performance = (Actual Output / Run Time) / Ideal Cycle Time — accounts for slow cycles and minor stops. (3) Quality = (Good Units) / (Total Units) — accounts for defects and rework. Each factor is expressed as a percentage; OEE is their product. Benchmarks: world-class OEE > 85% (which requires approximately 90% Availability × 95% Performance × 99.1% Quality); average manufacturing OEE is typically 60-65%. The "Six Big Losses" that OEE captures: equipment failure, setup/adjustment, idling/minor stops, reduced speed, process defects, and reduced yield. OEE is the central metric of TPM (Total Productive Maintenance) and is increasingly tracked in real-time by MES (Manufacturing Execution Systems) and IIoT dashboards. Per SEMI E10 (semiconductor) and ISO 22400 (manufacturing KPIs). OEE improvement directly translates to increased capacity without capital investment — improving OEE from 60% to 85% effectively adds 42% capacity from existing equipment.