Answer first
What this calculator tells you
Calculate overall equipment effectiveness from availability, performance and quality. Find which of the three losses holds a production line back the most. Formula: OEE = availability × performance × quality. At the worked-example inputs, the overall equipment effectiveness is 84.6%. Holding every other input steady, moving availability from 86.0% to 94.0% moves the result from 80.9% to 88.4%.
Transparent method
The formula
Find which of the three losses holds a production line back the most.
Worked example
Example inputs
How to interpret the result
Overall equipment effectiveness multiplies three shares: how much of the planned time the machine ran, how fast it ran, and how many good units it made. At 90, 95 and 99 percent, the product is about 84.6 percent, so even three good-looking numbers leave more than a seventh of the potential lost. Multiplying them, not averaging, is the point, since each loss cuts into what is left.
At the worked-example inputs the overall equipment effectiveness is 84.6%. It rises with availability, performance and quality.
These are planning metrics, not audited accounting or a valuation opinion.
Before you rely on it
What to check
Measure all three from the same period. A speed figure from one shift and a quality figure from another gives an OEE that describes neither.
The common error
Where people go wrong with OEE (overall equipment effectiveness) calculator
Averaging the three percentages. That would give 94.7 percent here and hide about two thirds of the real loss.
Sensitivity evidence
How availability changes the overall equipment effectiveness
Holding every other input at the worked-example value, moving availability from 86.0% to 94.0% moves the overall equipment effectiveness from 80.9% to 88.4%: a spread of 7.5%, or 9% of the worked-example result.
| Availability | Overall equipment effectiveness | Lost to availability, speed and quality |
|---|---|---|
| 86.0% | 80.9% | 19.1% |
| 88.0% | 82.8% | 17.2% |
| 90.0%worked example | 84.6% | 15.4% |
| 92.0% | 86.5% | 13.5% |
| 94.0% | 88.4% | 11.6% |
Every input, tested
Which input moves the overall equipment effectiveness most
Of the 3 inputs, availability moves the overall equipment effectiveness most (3.8% across the range tested) and quality moves it least (3.4%).
| Input | Tested from | To | Overall equipment effectiveness at each end | Swing |
|---|---|---|---|---|
| Availability | 88.0% | 92.0% | 82.8% to 86.5% | 3.8% (4.4%) |
| Performance | 93.0% | 97.0% | 82.9% to 86.4% | 3.6% (4.2%) |
| Quality | 97.0% | 101.0% | 82.9% to 86.4% | 3.4% (4.0%) |
Two variables at once
Overall equipment effectiveness by availability and performance
Across the grid the overall equipment effectiveness runs from 77.5% to 92.1%. Moving availability from 86.0% to 94.0% shifts it by 7.5% at the middle column, and moving performance from 91.0% to 99.0% shifts it by 7.1% at the middle row, so availability is the bigger lever here.
| Availability \ Performance | 91.0% | 95.0% | 99.0% |
|---|---|---|---|
| 86.0% | 77.5% | 80.9% | 84.3% |
| 88.0% | 79.3% | 82.8% | 86.2% |
| 90.0% | 81.1% | 84.6% | 88.2% |
| 92.0% | 82.9% | 86.5% | 90.2% |
| 94.0% | 84.7% | 88.4% | 92.1% |
The highlighted cell is the worked example: 84.6%.
Step by step
The worked example, input by input
| Input | Value used | What it means |
|---|---|---|
| Availability | 90.0% | Run time as a share of planned time. |
| Performance | 95.0% | Actual speed as a share of ideal speed. |
| Quality | 99.0% | Good units as a share of all units made. |
| Overall equipment effectiveness | 84.6% | |
| Lost to availability, speed and quality | 15.4% | |
Inputs, definitions and assumptions
Availability
Run time as a share of planned time. The prefilled worked-example value is 90.0%.
Performance
Actual speed as a share of ideal speed. The prefilled worked-example value is 95.0%.
Quality
Good units as a share of all units made. The prefilled worked-example value is 99.0%.
How to use this calculator
- 1Verify the inputs. Gather availability, performance and quality from your own documents; the prefilled values are examples.
- 2Save a baseline. The worked example puts the overall equipment effectiveness at 84.6%. Store your own version of it as Scenario A.
- 3Test one change. Start with availability, the input with the biggest effect here: moving availability from 88.0% to 92.0% takes the overall equipment effectiveness from 82.8% to 86.5%, a swing of 4.4% of the worked-example figure.
- 4Check the extremes. At half the example availability (45.0%) the overall equipment effectiveness is 42.3%; at double (180.0%) it is 169.3%.
People also ask
Frequently asked questions
How do you calculate OEE (overall equipment effectiveness)?
OEE = availability × performance × quality. Enter availability in percent, performance in percent and quality in percent (90 means 90%). At the worked-example inputs the overall equipment effectiveness is 84.6%.
What does the OEE (overall equipment effectiveness) result mean?
Find which of the three losses holds a production line back the most. At the worked-example inputs the overall equipment effectiveness is 84.6%. It rises with availability, performance and quality.
How much does availability change the overall equipment effectiveness?
Holding every other input at the worked-example value, moving availability from 86.0% to 94.0% moves the overall equipment effectiveness from 80.9% to 88.4%, a spread of 7.5%.
What are the limits of this OEE (overall equipment effectiveness) calculator?
These are planning metrics, not audited accounting or a valuation opinion. The tables on this page test availability only from 86.0% to 94.0%; a value outside that range is not tabulated here.
Which input moves the overall equipment effectiveness most in the OEE (overall equipment effectiveness) calculator?
Ranked by how far each moves the overall equipment effectiveness across the range tested: availability (3.8%, 4.4%), performance (3.6%, 4.2%) and quality (3.4%, 4.0%).
If I double availability in the OEE (overall equipment effectiveness) calculator, does the overall equipment effectiveness double?
Doubling it from 90.0% to 180.0% takes the overall equipment effectiveness from 84.6% to 169.3%, which is 2.00 times the worked-example figure. So the result scales almost exactly in proportion. Halving it to 45.0% gives 42.3%.
How much does performance matter in the OEE (overall equipment effectiveness) calculator?
The worked example uses 95.0%. Holding every other input at its worked-example value, moving performance from 93.0% to 97.0% takes the overall equipment effectiveness from 82.9% to 86.4%, a swing of 4.2% of the worked-example figure.
How much does quality matter in the OEE (overall equipment effectiveness) calculator?
The worked example uses 99.0%. With the other inputs left at the worked example, moving quality from 97.0% to 101.0% takes the overall equipment effectiveness from 82.9% to 86.4%, a swing of 4.0% of the worked-example figure.
Which inputs change the lost to availability, speed and quality in the OEE (overall equipment effectiveness) calculator?
At the worked-example inputs it is 15.4%. Availability takes it from 17.2% to 13.5%, performance takes it from 17.1% to 13.6% and quality takes it from 17.1% to 13.6%.
How much cash should a small business keep in reserve?
Many aim for several months of fixed costs. The right amount depends on how predictable the revenue is, how quickly customers pay and how easily the business can borrow in a shortfall.
Sources and evidence
Free Calculators Online is independent and is not affiliated with or endorsed by the source organizations. Educational estimates only.