# Availability Report

Shows the percentage of time that a device or component is considered available. You can filter this report on device, component, event class, or severity. You can also limit the time frame for the availability.

The value the percent available is calculated by first summing the duration of all events of a particular class with a production state of Production and with a severity greater than or equal to a specified severity. This sum is then divided by the total duration of the time range, and then subtracted from 1 and multiplied by 100 to get the percent available, as in the following equation:
1 - ((Total event down time) / (total duration)) * 100