Overall equipment effectiveness. The OEE Calculator takes planned production time (minutes), unplanned downtime (minutes), ideal cycle time (minutes per unit), units produced, defective units and returns overall equipment effectiveness plus availability, performance, quality. Results update as you type, and the formula is shown under the result so you can repeat it in your own spreadsheet.
Operational metrics turn time and capacity into money. Small improvements in utilisation, cycle time or defect rate compound across every unit produced, so measure them regularly. Use the worked example below to check the maths against your own figures.
How the OEE Calculator works
OEE multiplies the three ways a machine loses output: stoppages, running below ideal speed, and making defects. World-class is 85%; most plants start around 60%.
Worked example
With the example values (planned production time (minutes) of 480, unplanned downtime (minutes) of 40, ideal cycle time (minutes per unit) of 1, units produced of 400, defective units of 12), the overall equipment effectiveness is 80.83%; availability 91.67%, performance 90.91%, quality 97%. Change any figure above and the result updates immediately; use Copy results to paste the summary into a note or email.
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Frequently Asked Questions
How is overall equipment effectiveness calculated?
OEE = availability × performance × quality.
Which figures do I need?
Planned production time (minutes), unplanned downtime (minutes), ideal cycle time (minutes per unit), units produced, defective units. Take them from the same period and the same set of accounts or reports so the ratio is consistent, and check the example values as a guide to the units expected.
How do I use this in practice?
Measure the metric for a normal week, set a target, change one thing, and measure again. Operational gains come from many small, verified improvements.
