What Is Customer Lifetime Value?
Customer Lifetime Value (LTV, sometimes written CLV or CLTV) is the total profit a business can expect to earn from a single customer over the entire length of their relationship, not just from the first purchase. It shifts the focus from a one-off transaction to the long-term worth of acquiring and keeping a customer.
A customer who buys once and never returns has a low LTV. A customer who buys repeatedly for years, on a subscription or through regular reorders, has a high LTV even if each individual order is small. Understanding this distinction is what separates businesses that grow profitably from those that chase sales they cannot afford to win.
The LTV Formula
A common, practical formula is: LTV = Average Order Value x Purchase Frequency x Average Customer Lifespan x Gross Margin. Multiplying by gross margin is the step many businesses skip, but it is essential, because it expresses LTV as profit rather than revenue.
For example, a Pretoria coffee subscription charges R450 a month, customers stay an average of 18 months, and the gross margin is 40%. The LTV is R450 x 18 x 0.40, which equals R3,240 in profit per customer. That single number, rather than the R450 first order, is the figure you should use to plan acquisition spend.
Why LTV Matters for Your Ad Budgets
LTV sets the ceiling on what you can profitably spend to acquire a customer. The key relationship is between LTV and your cost per acquisition: a healthy benchmark is an LTV to CAC ratio of at least 3 to 1. Using the example above, an R3,240 LTV means you can comfortably spend several hundred rand to win a customer and still profit handsomely.
This changes how you read campaign performance. A Google Ads campaign that looks unprofitable on the first sale can be very profitable once repeat purchases are counted, which lets you bid more aggressively than competitors who only measure the initial transaction. It also informs your target ROAS: businesses with high LTV can accept a lower first-purchase ROAS because they know the customer will return. South African businesses with tight budgets gain the most from this discipline, since it directs spend toward channels and audiences that produce loyal, repeat buyers rather than one-time bargain hunters. Our Google Ads team builds campaigns around LTV, not just the first click.
FAQ
How do you calculate customer lifetime value?
A simple LTV formula is average order value multiplied by purchase frequency multiplied by the average customer lifespan, then multiplied by your gross margin to express it as profit rather than revenue.
Why does LTV matter for ad budgets?
Knowing LTV tells you how much you can profitably spend to acquire a customer. If a customer is worth R5,000 over their lifetime, a R600 acquisition cost is comfortably profitable, which lets you bid more aggressively than competitors who only look at the first sale.