It also known as the rate of attrition or customer churn, is the rate at which customers stop doing business with an entity. It is most commonly expressed as the percentage of service subscribers who discontinue their subscriptions within a given time period. It is also the rate at which employees leave their jobs within a certain period. For a company to expand its clientele, its growth rate (measured by the number of new customers) must exceed its churn rate.
To calculate customer churn rate, set a time period and tally up the total number of customers you've acquired and the number of customers who churned during that time period. Then, divide the number of customers who churned by the total number of customers acquired, and multiply that decimal by 100% to calculate your churn rate.
Customer Churn Rate = (Lost Customers ÷ Acquired Customers) x 100%
To calculate the churn rate for your organization, simply divide the number of churned customers, that is the number of customers that left your service over a certain period of time by the total number of customers you had during the period. Multiply the resultant by 100 to get the churn rate as a percentage.
Churn rate is an important metric since:
An acceptable annual churn rate for most of the companies is in the range of 5 – 10%. It essentially means that 5 to 10 customers are churning out of every 100 customers per year. But this is not a constant and varies widely across businesses.
They are broadly two types of churn rates:
Growth rate is the metric that determines the growth the organization experiences. The lower the churn rate and the higher the growth rate implies that the company is accelerating towards growth. Whereas, if the churn rate is higher than the growth rate indicates that the company is losing its customers.
There is no rigid rule as to how many times you can calculate the churn rate for an organization. It can be calculated annually, quarterly or monthly as decided by the company. Also, if we want the churn rate metric to be robust, we need lots of data. Also, while switching the time frame for calculating churn rate, say from monthly to quarterly, it is crucial that the adjustments be made rightly to avoid any discrepancies. There is another thing to be kept in mind, that is, in the monthly calculation, there is an underlying assumption that no customer can churn in the first month.