LTV changes how a business thinks about growth. If you only know what a customer is worth today, you can only afford to spend a little to acquire them. If you know what they are worth over years, you can outspend competitors on acquisition and still make more money.
How Do You Calculate LTV?
The simplest revenue formula is: LTV = average order value x purchase frequency per year x average customer lifespan in years.
A customer who spends $60 per order, buys 4 times a year, and stays for 3 years has an LTV of $720. A more rigorous version uses contribution margin instead of revenue, so the number reflects actual profit: multiply the result by your gross margin percentage.
Subscription businesses often use a different shortcut: LTV = average monthly revenue per customer x gross margin / monthly churn rate. The lower the churn, the longer the lifespan, and the higher the LTV.
Why Does LTV Matter So Much?
- It sets your acquisition ceiling. LTV defines the maximum you can rationally pay to acquire a customer, which is why it is always paired with CAC.
- It reprices your marketing. A campaign that looks unprofitable on first-order ROAS can be strongly profitable on lifetime value.
- It exposes your best segments. Customers acquired from different channels or offers often have very different lifetime values, which flat revenue reporting hides.
- It rewards retention work. Email programs, loyalty, and product quality show up directly in LTV long before they show up anywhere else.
What Is the LTV to CAC Ratio?
The LTV:CAC ratio compares what a customer is worth to what they cost to acquire. A ratio of 3:1 is the most widely used rule of thumb for a healthy business, popularized in SaaS investing and now applied broadly across e-commerce and services.
Below 1:1 means every new customer loses money. A very high ratio, such as 6:1 or more, often signals underinvestment in growth: the business could acquire more customers profitably but is not spending enough to do so.
How Do You Increase LTV?
LTV rises through three levers: order value, frequency, and lifespan. In practice that means better cross-sells and bundles, retention email flows that bring customers back, subscription or replenishment options where the product allows, and product and service quality that keeps churn low. Because existing customers convert far more easily than strangers, LTV work usually costs less than the equivalent revenue from new acquisition.
What Are the Limitations of LTV?
LTV is a prediction, not a fact. It assumes past behavior continues, which breaks when the product, pricing, or market shifts. Averages also hide variance: a small group of loyal customers often carries the mean while most buy once. Segmenting LTV by cohort, channel, and first product purchased makes the number honest enough to build decisions on.
Frequently asked questions
What is a good LTV to CAC ratio?+
A ratio of 3:1 is the most commonly cited healthy benchmark: the customer is worth three times what they cost to acquire. Below 1:1 loses money, and far above 3:1 may mean the business is underinvesting in growth.
Is LTV based on revenue or profit?+
Both versions exist. Revenue LTV is simpler to calculate, but margin-based LTV is more honest because it accounts for the cost of delivering the product. For budgeting decisions, margin-based LTV is the safer number.
What is the difference between LTV and CLV?+
Nothing. LTV (lifetime value) and CLV (customer lifetime value) are two abbreviations for the same metric, used interchangeably across the industry.
How does churn affect LTV?+
Churn shortens the customer lifespan, which directly cuts LTV. In subscription models, LTV is often calculated as margin per month divided by monthly churn, so halving churn roughly doubles LTV.