Field calculator
OEE calculator for a machine or production line
Enter one shift's numbers for a machine or a line and the calculator works out availability, performance, quality and OEE. It also shows how many planned minutes did not end up as good parts, which is the number to chase.
How this works
Run time is planned production time minus downtime. Availability is run time divided by planned time. Performance is ideal cycle time times total parts, divided by run time. Quality is good parts divided by total parts. OEE is availability x performance x quality. The definitions follow the standard OEE method, and the OEE guide walks through the same starting numbers by hand.
With the starting numbers, run time is 405 minutes, availability is 90.0 percent, performance is 91.4 percent and quality is 96.6 percent, so OEE comes out near 79.4 percent. Those numbers are made up. Replace them with your own before reading anything into the result.
The limits matter more than the arithmetic. The result is only as good as the ideal cycle time, so use the rated speed or the best sustained run, not the average, and treat performance above 100 percent as a sign the ideal is set too slow. Planned production time should exclude the breaks you scheduled, and the calculator counts every other stop as downtime, so apply the same rule on every shift you compare. It covers one machine or line over one period. To combine machines, add up the minutes and counts and run the totals through, instead of averaging the percentages. Stop reasons, which this page does not collect, are what tell you why the time was lost.