CLV. Explanation and calculator

The Customer Lifetime Value (CLV) is one of the most useful metrics for understanding how much a customer is truly “worth”, not on a single sale but over the entire length of the relationship with the company. In practice, CLV tries to answer a simple but decisive question: if I acquire a customer today, how much economic value will they bring me over time? This perspective changes the way marketing, sales and customer success are assessed: what matters is not only how much I earn right away, but how well I can keep the customer active, satisfied and returning.

CLV becomes even more powerful when we relate it to the CAC (Customer Acquisition Cost), that is, how much it costs to acquire a new customer. If CAC is high and CLV is low, growth risks being “expensive” and not very sustainable; on the contrary, a strong CLV relative to CAC indicates that the company is investing well and recovers the investment over time. The CLV/CAC ratio is often used as a thermometer: below 3 there is pressure on sustainability, between 3 and 6 it is usually considered a healthy balance, above 6 it may mean that customer value is very high… or that too little is being invested in acquisition and the company could grow faster.

There are two approaches to calculating CLV, both valid if the starting data are consistent.

The first is useful when you do not know the average customer lifespan and want to estimate it:
Customer Lifespan = 1 / (Customers who purchased only once / Total customers). Here the share of customers who purchase only once in the year is used as an approximation of the “churn rate”. Once the lifespan is estimated, you can calculate the average annual value per customer: Average Customer Value = Revenue / Total customers, and finally: CLV = Average Customer Value × Customer Lifespan.

The second approach is more direct when you already know the average lifespan (or can estimate it from reliable historical data):

Average Customer Value = AOV × Purchase Frequency, and then CLV = Average Customer Value × Customer Lifespan.

Where AOV stands for “Average Order Value”, the average purchase value.

In both cases the goal is the same: to turn sales and purchasing behaviour into a clear measure of economic value over time, to compare with CAC in order to guide concrete decisions on budget, channels, pricing and retention. Always keep in mind that the marketing investment used to calculate CAC is the total, not only the part related to pure customer acquisition.

Use the calculator below for a quick and simple first assessment!