Stock, shipping and production
OEE Calculator
Understand where planned production time went, with separate availability, performance and first-pass quality factors.
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How to use this tool
1. Enter your own figures below, or choose Load example to try the worked example. Check the units beside each field.
2. Select Calculate to see the result and its breakdown. If you change an input, calculate again before copying or printing.
3. Use Copy summary or Print / save PDF to keep your assumptions and results together. Reset clears the form.
How the calculation works
Run time = planned time − stop time. Availability = run time ÷ planned time. Performance = ideal cycle seconds × total parts ÷ run seconds. Quality = good parts ÷ total parts. OEE multiplies these factors, or equivalently divides good-parts ideal-cycle time by planned time. Losses are expressed as time so productive time plus all three losses reconciles to planned time.
Worked example
For 480 planned minutes, 60 stop minutes, a 1-second ideal cycle, 24,000 total parts and 22,800 good parts: availability is 87.5%, performance 95.24%, quality 95%, and OEE 79.17%. Fully productive time is 380 minutes, with 60 minutes stopped, 20 minutes speed loss and 20 minutes quality loss.
Questions and assumptions
What this estimate includes
The tool rejects performance above 100% rather than quietly hiding an inconsistent cycle time. A run with no parts has zero OEE and undefined quality. With no run time, performance is also undefined. Mixed products need separate runs or an explicitly weighted model. OEE is not a safety, profitability or universal factory-ranking score.
Can I save or share my result?
Copy summary includes the current inputs and results. Print / save PDF creates a local report with the calculation scope and source links. Your figures are not added to the page URL or stored by this tool. Refreshing clears the form.
Sources and further reading
Built and maintained by Custom Logic. Page updated .