LTV (Customer Lifetime Value)

LTV (customer lifetime value), also called CLV, is the total revenue or margin a customer brings in over their entire relationship with the company, from the first purchase until they leave. Instead of looking at a single sale, LTV asks how much that customer is worth over time, adding up repeat purchases, renewals and add-on sales.

It is one of the core metrics of any recurring revenue or repeat purchase model, and it is calculated and tracked as part of the business analytics that Metrix organizes. Its logic is simple: if you know how much a customer is worth over their lifetime, you know how much you can invest in acquiring them without losing money.

That is why LTV is almost never read on its own. Its natural counterpart is CAC (customer acquisition cost), and the health of the business is summed up in the LTV:CAC ratio: how many times you recover what you spent to win each customer.

LTV turns a vague question (is this customer worth it to us?) into an actionable number. The most common version in repeat purchase or subscription businesses starts from three ingredients: average order value, purchase frequency and customer lifetime (how long they stay before leaving). A common formula is: LTV = average order value × annual purchase frequency × years retained. In subscription models it is usually expressed as average monthly revenue per customer divided by the churn rate, because the lower the churn, the longer the lifetime and the higher the LTV.

One detail that separates a well-calculated LTV from an improvised one is whether it is measured on revenue or on margin. LTV on margin (net of product, service and support costs) is the one that actually helps you decide how much to invest, because it reflects the money that is left. Many companies get excited about a high revenue LTV that, once the cost of serving that customer is deducted, leaves a thin margin.

Why it matters so much

LTV is the compass that connects marketing, sales and finance with the same yardstick. It lets you answer questions that would otherwise be answered by gut feeling:

• How much to spend to acquire a customer: if a customer is worth $1,000 in LTV, paying $300 in CAC is healthy; paying $900 is cutting it close.
• Where to focus retention efforts: segmenting by LTV shows which customers deserve a loyalty program and which ones drain resources.
• How much the installed base is worth: the aggregate LTV of the customer base is a measure of the real value of the business, key for projections and for investors.
• Which channels bring better customers: one channel may deliver cheap leads with low LTV, and another expensive leads from customers who stay for years.

A concrete example

Think of a consumer goods distributor in Argentina that sells to neighborhood grocery stores and kiosks. A typical customer buys about 80,000 Argentine pesos (ARS) a month, repeats 12 times a year and stays active for 4 years on average. Their gross LTV is ARS 3,840,000. If the contribution margin is 20%, LTV on margin drops to ARS 768,000, and that is the real number the company can use to decide how much to invest in acquiring and retaining each account. With that figure, spending ARS 150,000 per customer on acquisition and loyalty is clearly profitable; the problem would not be the cost, but churn if those stores start buying from the competition.

Common mistakes

• Confusing LTV with the value of one sale: LTV accumulates over time; it is not the value of a single transaction.
• Using revenue instead of margin: it inflates the number and leads to overinvesting in acquisition.
• Assuming an endless lifetime: without measuring real churn, LTV becomes an optimistic fantasy.
• Averaging all customers together: a single average hides that your best customers can be worth many times more than the tail; it is better to calculate LTV by segment or cohort.
• Looking at it apart from CAC: a high LTV is useless if acquiring each customer costs almost as much.

How it differs from related metrics

LTV is often confused with revenue or portfolio health metrics that measure similar but not identical things:

In practice, LTV is the metric that best translates the quality of the customer relationship into money, and that is why it underpins acquisition, retention and valuation decisions. Calculating it well, on margin, by segment and always against CAC, is what separates companies that scale profitably from those that grow by burning cash.