How to Calculate O E E
What is O E E?
Overall Equipment Effectiveness measures equipment performance combining availability, performance, and quality. Identifies improvement opportunities.
Formula
Availability = actual run time ÷ planned run time
Step-by-Step Guide
- 1Availability = actual run time ÷ planned run time
- 2Performance = actual output ÷ theoretical output
- 3Quality = good units ÷ total units
- 4OEE = Availability × Performance × Quality
Worked Examples
Input
80% avail, 95% perf
Result
72.2% OEE
Common Mistakes to Avoid
- ✕Not including planned downtime in availability calculation
- ✕Using unrealistic theoretical maximums
Frequently Asked Questions
What's good OEE?
Below 65% poor, 65-85% acceptable, 85%+ excellent; world-class manufacturers achieve 90%+.
What causes low OEE?
Equipment downtime, slow running speed, defects; typically 40% availability, 5% performance, 5% quality loss.
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