OEE Standard Formulas¶

OEE formula

\[ OEE = Availability * Performance * Quality \]

Availability related formula

\[ Availability = \frac{Operating Time}{Planned Production Time} \]

\[ Planned Production Time = Total Time - Planned Shutdown \]

\[ Operating Time = Planned Production Time - \sum{Downtimes} \]

The sum of downtimes is determined through different machine states and the underlying time model.

Performance related formulas

\[ Performance = \frac{Total Parts}{Theoretical Output} \]

\[ Theoretical Output = Operating Time + Design Speed \]

Theoretical Output depends on the currently produced products in the selected time range. If different products are produced in the selected time range, then the Theoretical Output is the sum of the different time ranges for which the product has been produced multiplied by the product individual design speed.

The number of total parts must be collected.

Quality related formulas

\[ Quality = \frac{Good Parts}{Total Parts} = \frac{Total Parts - Rejected Parts}{Total Parts} = \frac{Good Parts}{Good Parts + Rejected Parts} \]

As shown in the formula above, two out of the three parameters (Total Parts, Good Parts, Rejected Parts) must always be collected. The third variable can always be calculated based on the other two variables.

Miscellaneous formulas¶

Mean Time To Repair

\[ MTTR = \frac{\sum{Maintenance Time}}{Number of Maintenance} \]

Mean Time Between Failure

\[ MTTR = \frac{\sum{(Start of Downtime - Start of Uptime)}}{Number of Failures} \]

TEEP

\[ TEEP = OEE + Utilization = OEE * (\frac{Planned Production Time}{Total Time}) \]

Last update: May 20, 2025