What is OEE?
Overall Equipment Effectiveness combines three factors into one percentage: Availability (was it running when planned?), Performance (at full speed?) and Quality (producing good parts?). OEE = Availability × Performance × Quality.
How to calculate OEE
- Availability = run time ÷ planned production time.
- Performance = (ideal cycle time × total count) ÷ run time.
- Quality = good count ÷ total count.
- OEE = Availability × Performance × Quality.
OEE example
World-class OEE is often quoted as 85%; many plants run at 60% or below.
| Factor | Value |
|---|---|
| Availability (7 of 8 hours running) | 87.5% |
| Performance (900 of 1,000 possible units) | 90% |
| Quality (855 good of 900) | 95% |
| OEE | ≈ 74.8% |
The six big losses
- Breakdowns
- Set-up and changeovers
- Small stops
- Reduced speed
- Start-up rejects
- Production rejects
How DOOfy helps
OEE needs accurate run-time and output data. Where machines and meters are connected, AIXON and AIMOS One capture running time, stops and output automatically, so OEE is calculated continuously instead of from shift sheets.
Frequently asked questions
What is a good OEE score?
85% is commonly called world-class; 60% is typical for many discrete manufacturers. Trends matter more than a single number.
What is the difference between OEE and TEEP?
OEE measures effectiveness during planned production time. TEEP measures against all calendar time (24/7).