Core CMMS Metrics
CMMS / EAM System Knowledge Base
Metrics in SimplyMobile CMMS and How They Are Calculated
Below are the basic metrics that can be reported in the system. SimplyMobile CMMS also allows you to create custom reports and summaries for other metrics. It’s crucial to choose the right filtering and grouping when calculating metrics—for example, computing a metric for a group of assets or only for assets in a specific department. SimplyMobile CMMS offers extensive filtering and grouping capabilities for quick verification of the metrics listed below.
- MTTF – Mean Time To Failure
Defines the average time a device can operate before the first failure occurs.
In CMMS maintenance systems, it is most often calculated as:
(Available operating time – Downtime) / Number of events [min]
Available operating time – the scheduled time when the machine is expected to be available for production; if no schedule exists, defaults to 24/7.
Downtime – the period during which production was scheduled but the machine was unavailable due to a failure. Note that downtime should exclude periods where a failure occurred but no production was scheduled. - MTTR – Mean Time To Repair
Defines the average time from the occurrence of a failure to the completion of the repair.
- MTBF – Mean Time Between Failures
Defines the average uninterrupted operating time of a device.
The MTBF metric is calculated using the following formula:
MTBF = MTTF + MTTR
- OEE – Overall Equipment Effectiveness
Measures equipment utilization efficiency based on three subordinate metrics: availability, performance, and quality.
OEE = availability × performance × quality