OEE Calculator | CWX Workflow Tools
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Ops Console / Module 05 / OEE

OEE Calculator

One number for how the machine really ran.

Overall Equipment Effectiveness rolls three separate losses, downtime, slow running, and defects, into a single score out of 100%. It cuts through the feeling that a machine is busy and shows how much of its real capacity actually turned into good product.

Time5 min
FormatCalculator
SavesPDF · JSON record
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What it is

Overall Equipment Effectiveness multiplies three losses into one score: availability (was it running), performance (was it running fast), and quality (was the output good).

When to use it

To find where a machine loses its day. A press that is up all shift but slow, or fast but scrapping, will show exactly which loss is biggest.

How to run it

Enter the planned time, the downtime, the ideal cycle, and the counts. World-class OEE is around 85%; most shops start far lower and that is the point.

Time

Output

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Availability
–
Performance
–
Quality
–
OEE

Availability = run time / planned. Performance = ideal time for the units made / run time. Quality = good / total. Performance is capped at 100%; if it pins there, your ideal cycle may be set too slow.

Saved

Worked example: a flatbed shift

Planned time is 480 minutes with 60 minutes of stops, so availability is 87.5%. The ideal cycle is 30 seconds and 760 units came off, which is 90.5% performance. 740 of those were good, so quality is 97.4%. Multiply them and OEE is 77.1%. The biggest loss is performance, so the press is mostly up but running slow, not breaking down.