How to calculate MTTR
MTTR is an average of the analysis of several items. For a specific period of time, such as a day, week or month, for each repair that IT performed, the amount of time each repair takes is added to other similar repair values. That value, usually expressed in hours, is then divided In practice, BCDR teams will use this calculation on a series of events that require repair. This will provide them with MTTR. From there, it is easier to get an idea of how much they need to reduce MTTR or if current systems are sufficient.
While this calculation seems relatively simple and BCDR teams can easily configure it with a spreadsheet, potential flaws and errors can occur. For example, the MTTR equation assumes that tasks are performed sequentially by appropriately trained personnel. If the order of tasks is changed, if multiple tasks happen at once or if the person performing the tasks isn’t properly trained, the calculation could be incorrect.