Customer Lifetime Value (CLV)

Customer Lifetime Value, or CLV, is the total value that a customer contributes over the entire duration of the business relationship. It adds up how much contribution margin a customer is expected to generate over time. Compared with acquisition costs, it shows whether a customer is worthwhile in the long run. The common approximation is: average revenue per customer per period multiplied by gross margin, divided by the churn rate for the same period.

With constant customer churn, its inverse approximates expected customer lifetime, so one percent monthly churn implies roughly 100 months. That is also the metric's greatest weakness, because small changes in a low churn rate change the result dramatically, and multi-year projections are barely reliable for young companies. Robust calculations consider discounting future contributions and use a justified forecast horizon. They use a contribution after costs rather than revenue alone, distinguishing gross margin from contribution margin. It should also be recognised that existing customers often buy additional services, captured through net revenue retention and raising the value, while ongoing servicing costs reduce it.

In practice the metric is less interesting as an absolute amount than as a ratio to acquisition cost and as a comparison between segments, because in that form it shows which customer groups deserve growth investment and which do not. It is sensible to present the metric in negotiations not as a single value but as a range with stated assumptions, because it depends directly on churn, gross margin, discounting and time horizon and can be multiplied by small changes in these inputs. A backward-looking view has also proven useful: instead of a theoretical figure, the actually observed cumulative contribution of completed cohorts is shown, which carries far more weight in diligence than a model.