Free toolsOEE
OEE calculator.
Overall equipment effectiveness for one machine or cell over one shift. See availability, performance and quality, how many minutes each one cost you, and which loss to attack first. Runs in your browser.
Results
Enter one shift of data, or try the sample: an eight-hour shift with 30 minutes of breaks, 47 minutes of unplanned stops, a 60 second ideal cycle, 330 parts and 9 rejects.
OEE
Availability
Performance
Quality
Where the planned time went
- Good parts at ideal rate
- Quality loss
- Performance loss
- Availability loss
- Planned production time
- Run time
- Good parts
- Possible at ideal rate
How OEE is calculated
OEE multiplies three ratios. Each one isolates a different kind of loss.
- Availability
- Run time divided by planned production time. Planned time is the shift minus planned breaks; run time is planned time minus unplanned stops, setups and waiting.
- Performance
- Ideal cycle time multiplied by total parts, divided by run time. It captures slow cycles and short stops while the machine is nominally running.
- Quality
- Good parts divided by total parts. Scrap and rework both count as losses, because they used machine time.
- OEE
- Availability × performance × quality, which equals good parts multiplied by ideal cycle time, divided by planned production time.
- Where to use it
- On the constraint first. Raising OEE on a machine with spare capacity doesn't increase the shop's output. See how to find the real bottleneck.
Low OEE, and not sure why?
A bottleneck analysis measures where the time really goes at your constraint, and sets out the cheapest ways to win it back before you spend on capacity.