Overall Equipment Effectiveness
Overall Equipment Effectiveness, or OEE, measures how effectively planned production time is converted into good output by combining availability, performance, and quality.
What this term means in maintenance
Overall Equipment Effectiveness, or OEE, measures how effectively planned production time is converted into good output by combining availability, performance, and quality.
OEE formula
OEE = Availability × Performance × Quality
Where:
- Availability compares run time with planned production time
- Performance compares actual production rate with the ideal production rate
- Quality compares good output with total output
Practical example
If availability is 87.5%, performance is 95.2%, and quality is 95%:
OEE = 0.875 × 0.952 × 0.95 × 100 ≈ 79.1%
OEE is approximately 79.2%.
What OEE helps reveal
OEE separates production loss into time loss, speed loss, and quality loss. This prevents teams from treating every production problem as a maintenance problem.
Maintenance connection
Maintenance can affect OEE through:
- Breakdowns
- Minor stops
- Slow running caused by equipment condition
- Setup or restart delays
- Defects related to machine performance
Operations, materials, process conditions, and quality controls can also affect OEE.
Important limitation
OEE depends on consistent definitions for planned production time, ideal cycle time, total count, and good count. Comparing lines or plants without aligned definitions can be misleading.
How this term differs
Overall Equipment Effectiveness is the combined Availability × Performance × Quality measure during planned production time. It is related to Total Effective Equipment Performance, OEE Availability, and Quality Rate, but these terms describe different records, measures, roles, strategies, or decisions and should not be used interchangeably.
Related concepts
Related maintenance terms
Keep exploring connected CMMS, reliability, and maintenance planning terms.
Equipment Availability
Equipment availability is the percentage of required or scheduled time during which an asset is capable of performing its intended function.
Equipment Downtime
Equipment downtime is the period when an asset is required or scheduled to operate but is unavailable or unable to perform its intended function.
Maintenance Key Performance Indicator
A maintenance key performance indicator, or KPI, is a defined measure used to monitor whether maintenance processes and outcomes support business objectives.
Glossary FAQs
- What are the three components of OEE?
OEE combines availability, performance, and quality.
- Is OEE only a maintenance metric?
No. OEE reflects losses influenced by maintenance, operations, materials, process conditions, setup, and quality.
- Can OEE exceed 100 percent?
A result above 100 percent normally indicates an incorrect ideal cycle time, count, run time, or unit conversion.