Customer "churn", or customer churn rate is calculated by dividing how many customers a business had at the end of the period by how many you had at the start of the period and then you multiply that number by 100.  This equation will provide you with a percentage representing customer churn rate for a business during a specific period. For reference, if you had 3,500 customers on May 1 at midnight and on May 31 at 11:59 p.m. you had 3,200 customers, you would figure your customer churn rate this way: 3200/3500 = 0.91 (3200 divided by 3500 equals 0.91) 0.91 x 100 = 91%. (0.91 times 100 = 91%) Therefore, in this case your customer churn rate for the month of May would be 91%. Keep in mind that the higher the customer churn rate is the more customers a business is losing. That should prompt a business to do better with their customer service and customer experience overall. Customer churn can occur due to poor customer service (experience), lack of personalization, lack of competition, and high prices. Don’t let these things increase your customer churn.