OEE calculator
Overall equipment effectiveness (OEE) shows how much of the planned production time turns into good parts at full speed. Enter one shift or one day of data to see the three factors and the overall score.
Result
- OEE
- 76.6%
- Availability
- 90.6%
- Performance
- 86.2%
- Quality
- 98%
- Run time
- 435 min
- Good units
- 14,700
- Possible units at ideal speed
- 17,400
How to use this tool
- Enter the planned production time for the period and the minutes lost to unplanned stops.
- Enter the ideal cycle time per unit, usually the rated speed of the machine.
- Enter the total count and the rejects. OEE and the three factors update instantly.
- Compare the factors: the lowest one shows where the biggest loss is.
Good to know
- Planned production time excludes planned breaks; include them if your plant measures against total shift time.
- Rework counts as a reject in the quality factor even when the unit is later sold.
Frequently asked questions
How is OEE calculated?
OEE is availability × performance × quality. Availability is run time divided by planned time, performance is ideal cycle time × total count divided by run time, and quality is good units divided by total units. With 435 minutes of run time out of 480, 15,000 units at 1.5 seconds each and 300 rejects, OEE is 90.6% × 86.2% × 98.0% = 76.6%.
What is a good OEE score?
An OEE of 85% is widely quoted as world class for discrete manufacturing, 60% is typical for lines that have not been measured closely, and 40% is common when measurement starts. The number matters less than the trend and the split between the three factors, which tells you whether to attack downtime, slow cycles or defects first.
Why is performance above 100%?
Performance compares actual output with the ideal cycle time, so a value above 100% means the ideal cycle time entered is slower than the line really runs. Use the true best repeatable cycle time, not a conservative standard, otherwise performance losses are hidden and OEE is overstated.
Results are estimates for general information. Double-check anything important with an official source.