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 towards 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.
How to increase customer lifetime value
Lifetime value rises when customers buy more, more often, or for longer, so the levers are retention and expansion rather than acquisition. Improving the first purchase experience, following up with helpful onboarding, rewarding repeat custom, and staying in contact through email and other owned channels all lift the number of purchases a customer makes before they lapse. Raising average order value through relevant cross-sells and bundles helps too. Because keeping a customer is usually far cheaper than winning a new one, small gains in retention compound into large gains in lifetime value, which in turn raises how much you can profitably spend to acquire the next customer.
The LTV to CAC ratio
Lifetime value means most when read against customer acquisition cost (CAC), the amount spent to win a customer. The LTV to CAC ratio, lifetime value divided by acquisition cost, shows whether growth is sustainable. A ratio around 3 to 1 is a common healthy benchmark: each customer returns roughly three times what they cost to acquire, leaving room for margin and overheads. A ratio near 1 to 1 means you barely recover acquisition costs, while a very high ratio can signal under-investment in growth. Knowing your LTV to CAC tells you how aggressively you can afford to spend on marketing, and where the ceiling on profitable acquisition sits.
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.
What is a good LTV to CAC ratio?
Around 3 to 1 is a widely used healthy benchmark: each customer returns roughly three times their acquisition cost. Nearer 1 to 1 means little profit after winning the customer; a very high ratio can mean you are under-investing in growth and could scale faster.
How do you increase customer lifetime value?
Focus on retention and expansion: improve the first experience, encourage repeat purchases, raise average order value with relevant offers, and keep in contact through owned channels such as email. Because retaining a customer is cheaper than acquiring one, small retention gains compound into large LTV gains.