Customer LTV: how to measure it

Customer lifetime valueCustomer lifetime value (LTV)The total gross profit you expect from a customer across the whole relationship, not a single order. It tells you how much you can afford to spend to acquire and keep them.View in glossary is the total revenue a business can expect from a single customer account over the duration of the relationship. It is one of the most important figures in marketing, and one of the most commonly miscalculated.

The reason it matters is simple. If you do not know what a customer is worth over time, you cannot know what you should spend to acquire one. You end up optimising for first-purchase cost while ignoring whether the customers you are acquiring are worth keeping. And the ones worth keeping are rarely the cheapest ones to find.

What customer lifetime value is and how to calculate it

Customer lifetime valueCustomer lifetime value (LTV)The total gross profit you expect from a customer across the whole relationship, not a single order. It tells you how much you can afford to spend to acquire and keep them.View in glossary is a measure of the net value a customer generates over their entire relationship with a business. It combines how much they spend per transaction, how often they buy, and how long they stay.

The basic formula:

Customer lifetime valueCustomer lifetime value (LTV)The total gross profit you expect from a customer across the whole relationship, not a single order. It tells you how much you can afford to spend to acquire and keep them.View in glossary = Average order valueAverage order valueThe average amount spent per order: total revenue divided by number of orders. AOV thresholds are a common way to make value-based segments measurable, such as "customers in the top 20% by average order value".View in glossary × Purchase frequency × Customer lifespan

For example: a customer who spends £80 per order, buys four times a year, and stays active for three years has a customer lifetime valueCustomer lifetime value (LTV)The total gross profit you expect from a customer across the whole relationship, not a single order. It tells you how much you can afford to spend to acquire and keep them.View in glossary of £80 × 4 × 3 = £960.

This calculation gives you a historic average. It tells you what your typical customer has been worth in the past. For most businesses, it is the right place to start: the number is interpretable, comparable over time, and actionable once you have it.

Customer lifetime value by business model

The formula varies depending on how your business works.

DTCDirect to Consumer (DTC)Direct to Consumer (DTC) is a business model where a company sells its products or services straight to end customers, cutting out intermediaries like wholesalers, distributors, and third-party retailers. Traditionally, a manufacturer might sell to a distributor, who sells to a retailer, who sells to the consumer. A DTC brand skips those middle layers and owns the entire customer relationship, typically through its own e-commerce site, though it can also include brand-owned physical stores or subscription models. View in glossary and e-commerce. For businesses with variable purchase frequency, the calculation needs to account for the fact that customers do not all stay for the same period. A more accurate approach segments the calculation by cohortCohortA group fixed by a shared start event, most often first purchase in the same period. Membership never changes, which makes cohorts ideal for measuring how customer quality shifts over time, and the wrong tool for ongoing behaviour, which needs a segment.View in glossary: customers acquired in Q1 2023 versus Q1 2024, with separate tracking of their average order value, purchase frequency, and retention rate. This makes it possible to see whether lifetime value is improving or deteriorating with each new acquisition wave.

Subscription businesses. For subscription models, the formula simplifies: customer lifetime valueCustomer lifetime value (LTV)The total gross profit you expect from a customer across the whole relationship, not a single order. It tells you how much you can afford to spend to acquire and keep them.View in glossary = monthly recurring revenue per customer ÷ monthly churn rateChurn rateThe rate at which customers stop buying or paying over a given period. Small differences compound, so churn quietly sets the ceiling on growth.View in glossary. A customer paying £40 per month with a monthly churn rate of 2% has a predicted lifetime value of £40 ÷ 0.02 = £2,000. The input that matters most here is churn rate, because small improvements in retention have an outsized effect on lifetime value.

B2B and enterprise. Customer lifetime valueCustomer lifetime value (LTV)The total gross profit you expect from a customer across the whole relationship, not a single order. It tells you how much you can afford to spend to acquire and keep them.View in glossary for B2B typically requires a longer calculation window and needs to account for expansion revenue (upsells, additional seats, new products) as well as initial contract value. A customer who starts at £5,000 per year and expands to £20,000 over three years has a very different lifetime value than one who stays flat, and the calculation should reflect that trajectory.

What most LTV calculations get wrong

The most common mistake is treating customer lifetime valueCustomer lifetime value (LTV)The total gross profit you expect from a customer across the whole relationship, not a single order. It tells you how much you can afford to spend to acquire and keep them.View in glossary as a single average for the whole customer base.

If your customer lifetime valueCustomer lifetime value (LTV)The total gross profit you expect from a customer across the whole relationship, not a single order. It tells you how much you can afford to spend to acquire and keep them.View in glossary is £800, that figure is the average across customers who spent £3,000 over five years and customers who bought once and never returned. The average tells you very little about how to act on either group.

Segmenting customer lifetime valueCustomer lifetime value (LTV)The total gross profit you expect from a customer across the whole relationship, not a single order. It tells you how much you can afford to spend to acquire and keep them.View in glossary by acquisition channel, product category, or customer cohortCohortA group fixed by a shared start event, most often first purchase in the same period. Membership never changes, which makes cohorts ideal for measuring how customer quality shifts over time, and the wrong tool for ongoing behaviour, which needs a segment.View in glossary changes what the number tells you. If customers acquired through paid social have an average customer lifetime value of £320 but customers acquired through email referral have a lifetime value of £950, the acquisition mix is a business model question as much as a media question.

The second common mistake is using historic average as a proxy for predicted value. A customer who has been active for two years and spends regularly looks high-value on a historic calculation. A predictive lifetime value model would also tell you whether they are likely to keep spending at that rate, increase, or be at risk of lapse. The historic number describes the past. The predictive number informs what you do next.

How to improve customer lifetime value

Customer lifetime valueCustomer lifetime value (LTV)The total gross profit you expect from a customer across the whole relationship, not a single order. It tells you how much you can afford to spend to acquire and keep them.View in glossary improves through a combination of increasing order value, increasing purchase frequency, and extending the customer relationship.

Order value responds to upselling and cross-selling at the right moments: recommending complementary products at checkout, or higher-tier versions of products a customer regularly buys.

Purchase frequency responds to lifecycle marketing: timely re-engagement emails based on each customer's typical purchase cycle, personalised recommendations based on past behaviour, and loyalty mechanics that reward continued buying without discounting across the whole base.

Retention (the length of the customer relationship) has the largest compounding effect. A customer retained for four years instead of two does not generate twice the lifetime value: they generate more, because the incremental cost of serving an existing customer is lower than the cost of acquiring a new one.

Customer lifetime valueCustomer lifetime value (LTV)The total gross profit you expect from a customer across the whole relationship, not a single order. It tells you how much you can afford to spend to acquire and keep them.View in glossary is not a number to monitor passively. It is the output of active decisions about who you acquire, how you communicate with them, and what you offer them over time.