OEE calculator
Overall equipment effectiveness from one shift's figures: how much of the planned time made good parts at the ideal rate, split into availability, performance and quality, with the loss that costs you most.
How OEE is worked out
- Availability = running time ÷ planned time, where running time is planned time less unplanned stops.
- Performance = (parts made × ideal cycle time) ÷ running time: how close to full speed the line ran.
- Quality = good parts ÷ parts made.
- OEE = availability × performance × quality. 85% is often quoted as world class for discrete manufacturing.
OEE says how much is lost, not why. A simulation of the line shows where: which station is the bottleneck, how long parts wait in buffers, and what an extra operator or a shorter changeover would recover.