Glossary Updates12 new terms added to the glossaries · October 2, 2026, 22:44 CEST
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Glossary · Manufacturing systems

Overall equipment effectiveness (OEE)

Also known as: OEE

German: Gesamtanlageneffektivität (OEE)

In manufacturing, overall equipment effectiveness (OEE) is a key performance indicator that measures how effectively equipment is used during planned production time, calculated as availability × performance × quality.

  • Manufacturing systems
  • Standards

In one sentence

Overall equipment effectiveness (OEE) measures equipment use in planned production time as availability × performance × quality.

Example

A line with 90 percent availability, 95 percent performance and 98 percent quality reaches an OEE of about 84 percent.

How it applies

  • Operation: OEE combines the three loss categories Availability loss, Performance loss and Quality loss into one figure. The loss breakdown matters more than the number: it shows where to improve.
  • Definitions: ISO 22400-2 defines OEE among its KPIs; VDMA 66412-1 is another common reference in German-speaking countries. What counts as planned production time and ideal cycle time must be defined, or figures can't be compared across lines or plants.
  • Data: MES or dedicated OEE systems calculate OEE from machine states, counters and quality data. Automatic data collection is more reliable than manual logs.
  • Documentation: Document the calculation rules, the stop reason catalog and the ideal cycle times per product. Reports that show OEE should state the rules they use.

OEE vs. availability

Availability measures only whether equipment runs. OEE also includes speed and quality losses, so a machine can have high availability and still a low OEE.

By knowledge.aitechdoc.world · Published September 26, 2026 · Last reviewed

Source: ISO 22400-2:2014, Automation systems and integration — Key performance indicators (KPIs) for manufacturing operations management — Part 2: Definitions and descriptions

Definitions follow the cited standards and specifications. Where a source is a copyrighted publication, such as an ISO, IEC or EN standard, the definition is a close paraphrase, not a verbatim quotation, so as not to infringe copyright. We recommend reading the original publication. The sections “How it applies” are editorial commentary by AI TechDoc Knowledge and are not part of any standard.

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