How to use the OEE calculator
Overall Equipment Effectiveness (OEE) compresses three separate losses into a single number that tells you how much good product a machine actually delivered during the time you planned to run it. Enter planned production time, downtime, total output, ideal cycle time, and reject quantity, and the calculator returns availability, performance, and quality, then multiplies them together.
Availability captures stop losses, performance captures speed losses, and quality captures defect losses. Two lines can both sit at 70% OEE and still need completely different fixes, so read the three factors before you read the headline number. A low performance factor points to minor stops and reduced running speed; a low quality factor points to process control.
The widely quoted world-class benchmark is 90% availability, 95% performance, and 99.9% quality, which multiplies out to roughly 85% OEE. Process plants and high-mix, low-volume cells naturally land in different ranges, so tracking the trend on one asset is far more useful than comparing your number with another plant.
Ideal cycle time is the shortest time the equipment needs for one piece under perfect conditions, taken from the nameplate rate or your best sustained run. If it is set too generously, the performance factor climbs past 100% and the whole metric stops meaning anything, so recheck your inputs whenever that happens.
Frequently asked questions
Almost always the ideal cycle time is set longer than the machine actually runs, or the output count is overstated. Reset ideal cycle time from the nameplate rate or your best sustained run.
Standard practice is to exclude planned stops from planned production time and count only unplanned events such as breakdowns, changeovers, and material waits as downtime.
OEE divides by planned production time, while TEEP divides by all calendar hours (24 hours per day). TEEP therefore also reflects how fully you are using the asset you paid for.