Once you have established your goals for customer retention and loyalty, you must select the metrics that will help you monitor and assess your progress. There are numerous metrics that can be used, but some of the most popular and effective are the retention rate, churn rate, customer lifetime value (CLV), net promoter score (NPS), and customer satisfaction score (CSAT). The retention rate is the percentage of customers who remain active users of your product over a given period, such as a week, month, or year. The churn rate is the opposite, representing the percentage of customers who discontinue using your product over a given period. CLV is the total revenue you anticipate to generate from a customer over their entire relationship with your product, based on their average revenue per user (ARPU) and retention rate. NPS is a measure of how likely your customers are to recommend your product to others, ranging from -100 to 100, with -100 indicating all detractors and 100 indicating all promoters. Lastly, CSAT is a measure of how satisfied your customers are with your product, ranging from 1 to 5, with 1 being very dissatisfied and 5 being very satisfied.