How to use Custom Metrics in Facebook ads automated rules
Metrics are the basis for measuring ads performance. Still the core set of metrics vary from company to company. Even with over 300 metrics available in Facebook Ads Manager there are dozens of cases that have to be calculated manually. Most popular metrics that aren't available in Facebook are: Return
26 Nov 2019 ... To calculate efficiency ratio divide the ad expenses by the revenue. In July 2019 Facebook has introduced custom metrics to ads reporting.