OEE Calculator
Overall equipment effectiveness with its three factors: availability, performance and quality.
Results
OEE
76.39
%
Availability
90.21
%
Performance
86.61
%
Quality
97.78
%
What this tool does
OEE compresses three separate losses into one number, which is useful for tracking a trend and useless for finding a cause. Always read the three factors underneath it: the same 62 % can be a reliability problem, a speed problem or a scrap problem.
Formula
OEE = Availability × Performance × Quality
Variables
| Symbol | Meaning | Unit |
|---|---|---|
pt | Planned production time | min |
dt | Unplanned downtime | min |
ic | Ideal cycle time | s |
tu | Total units produced | — |
gu | Good units | — |
OEE | OEE | % |
A | Availability | % |
P | Performance | % |
Q | Quality | % |
Worked example
- Planned production time480 min
- Unplanned downtime47 min
- Ideal cycle time25 s
- Total units produced900
- Good units880
- OEE76.39 %
- Availability90.21 %
- Performance86.61 %
- Quality97.78 %
Limitations
- For work that must comply with a standard or be signed off, check the result against the applicable code and have it reviewed by a qualified engineer.
- The result is an estimate based only on the values you type. Real situations often include factors this calculator does not know about.
Frequently asked questions
What counts as a good OEE?
The figures most often quoted are 85 % as world class for discrete manufacturing and around 60 % as typical, but they only mean something when the three factors are measured consistently. A plant that excludes planned maintenance from planned time will always look better than one that does not, without producing a single extra part.