Lifetime Value (LTV) is an estimate of how much money a customer will generate for your business across the entire relationship with them, not just their first purchase. It's one of the metrics that most changes how marketing decisions get made once you actually start looking at it, because it forces you to stop judging every campaign purely by the immediate return of the first order.
Why looking only at the first sale leads to mistakes
If an acquisition campaign costs more than it generates on the first purchase, the quick conclusion is that it isn't profitable and should be cut. But if the customers acquired through that specific campaign tend to repurchase several times over the year, with a total LTV far higher than the acquisition cost, cutting the campaign based only on the first order is a mistake that costs real future revenue.
How to calculate it, in its simplest form
A basic, accessible formula is: average order value, multiplied by the average number of orders per year, multiplied by the average number of years a customer keeps buying before they stop. It's not an exact figure at the individual level (it's an average, with all the variability that implies), but as a reference for marketing decisions it's far more useful than looking only at the value of the first purchase.
What to do with LTV once you know it
It defines how much you can afford to spend acquiring a new customer (acquisition cost), because a business with a high LTV can afford to invest far more in marketing per new customer than one with a low LTV, even if both sell a similarly priced product on the first purchase. It also helps decide which customer segment deserves more effort: if a specific type of customer has a notably higher LTV than the rest, directing more budget towards attracting that specific profile tends to be more profitable than treating the whole audience the same.
The mistake of calculating it once and forgetting about it
LTV changes over time, as the business, the competition and the customer's own behaviour evolve, so calculating it once and never revisiting it leads to decisions based on outdated data. Reviewing it at least once a year, or whenever a relevant change in buying behaviour is detected, keeps the metric useful for current decision-making.
Frequently asked questions
Do I need a lot of historical data to calculate LTV?
It helps to have at least one or two years of purchase history for a reliable estimate, but even with less data you can make a reasonable first approximation, always flagging it as a preliminary estimate subject to revision.
Is LTV the same for every customer at my business?
Almost never: it's common to have customer segments with very different LTV from each other (by acquisition channel, by type of product bought initially, by geographic area), and calculating LTV only as a general average hides that variation, which is usually the most useful part of the analysis.
How does LTV relate to customer acquisition cost (CAC)?
The ratio between the two (LTV divided by CAC) is one of the most widely used indicators for assessing a business's overall health: a ratio of three to one or higher is usually considered healthy, while a ratio close to one indicates the business barely recovers what it spends acquiring each new customer.