# Overall Equipment Effectiveness

Operations · `OEE` · verification: source checked

OEE measures how much of planned production time a machine spends making good parts at full speed. It multiplies three ratios: availability, performance and quality. A score of 1.0 means only good parts, as fast as possible, with no stops.

## Specification

| Property | Value |
|---|---|
| Kind | metric |

## Formula

```
OEE = A * P * Q
```

- `A`: Availability
- `P`: Performance
- `Q`: Quality

## Connected

- Related: [Downtime](https://machineschema.com/operational/downtime.md), [OEE Availability Rate](https://machineschema.com/operational/oee-availability.md), [OEE Performance Rate](https://machineschema.com/operational/oee-performance.md), [OEE Quality Rate](https://machineschema.com/operational/oee-quality.md), [Operational availability vs operating rate](https://machineschema.com/operational/operating-rate-vs-availability.md), [Total Productive Maintenance (TPM)](https://machineschema.com/operational/tpm.md)

## Study notes

- Availability = run time / planned production time.
- Performance = (ideal cycle time x total count) / run time.
- Quality = good count / total count.
- The three factors multiply, so three 90% scores give an OEE of about 73%.

## Sources

1. [OEE.com: Calculating OEE](https://www.oee.com/calculating-oee/) (accessed 2026-10-25)

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Source page: https://machineschema.com/operational/oee  
JSON: https://machineschema.com/operational/oee.json  
License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite Machine Schema and the original sources.