Churn, or attrition, is another really important metric you should keep your eye on. This is a measures the percentage of people who leave every month.
Customer or user attrition for a given period expressed as a percentage. Initially used for subscription businesses but now a popular metric for other internet based businesses such as eCommerce. In such cases, it’s important you define what constitutes a ‘churned’ customer.
If you have a high churn rate this is extremely worrying for your company, you have managed to convert the customers but for some reason have not been able to retain them. It is important to search for feedback in order to understand why they no longer user or want your service to fix this issue moving forward.