OEE Calculator
Availability × Performance × Quality in one score.
Shift length minus scheduled breaks
87.5%
95.2%
96.0%
80.0%
85%+
World Class
60–85%
Good
40–60%
Fair
<40%
Needs Improvement
| Manufacturing Type | Typical OEE | Key Challenges |
|---|---|---|
| Discrete Manufacturing | 60–75% | Changeovers, minor stops, varied cycle times |
| Process Manufacturing | 80–90% | Startup/shutdown losses, grade changes |
| Job Shop | 40–60% | High changeover frequency, varied routings |
| Packaging Lines | 55–70% | Micro-stops, product changeovers, material jams |
| Automotive Assembly | 75–85% | Takt time adherence, quality requirements |
World class is 85% OEE regardless of manufacturing type, as defined by the standard Availability 90% x Performance 95% x Quality 99.9% benchmark. The ranges above are typical observed performance, not separate world-class targets - process plants sit higher because they run continuously with few changeovers, job shops sit lower because they change over constantly.
OEE = Availability × Performance × Quality
Pick one machine and one shift, not a plant and a month, or the losses average into noise. Planned time is the shift minus scheduled breaks and planned maintenance, because OEE measures what you did with the time you meant to run. Run time is planned time minus every unplanned stop, including the short ones nobody writes down. Total parts is everything the machine made, good or scrap, and good parts counts only what passed first time, so a reworked part is not a good part. Ideal cycle time is the fastest sustained rate for that part on that machine, which is the nameplate rate rather than your current average.
What is a good OEE score?
World class is 85 percent, which comes from 90 percent availability times 95 percent performance times 99.9 percent quality. Most discrete manufacturers run 60 to 75 percent and job shops 40 to 60 percent, because constant changeovers eat availability. Compare the machine against its own trend before you compare it to anyone else.
Why is my performance over 100 percent?
Your ideal cycle time is too slow, or the part count is wrong. Performance divides theoretical run time by actual run time, so if the machine beats the rate you entered, the number exceeds 100. Reset ideal cycle time to the fastest rate the machine has genuinely held, not the quoted standard.
Does planned downtime count against OEE?
No. Scheduled breaks, planned maintenance and shifts you never intended to run come out of planned time before the calculation starts, so they cannot hurt availability. That is deliberate. If you want a number that does charge you for idle capacity, you want TEEP or utilisation instead.
What is the difference between OEE and utilisation?
Utilisation asks how much of the calendar the machine ran. OEE asks how well it ran during the time you planned to use it, and splits the shortfall into availability, performance and quality. A machine can show high utilisation and poor OEE if it runs slowly and scraps parts.
Do reworked parts count as good parts?
No. Quality measures first pass yield, so anything that needed rework is a quality loss even if it eventually shipped. Counting rework as good hides the cost of fixing it, which is usually the most expensive loss on the sheet. Enter only parts that passed the first time.
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