TL;DR: The LTV:CAC ratio compares the lifetime value of a customer (LTV) to the cost of acquiring them (CAC). It is a headline measure of growth efficiency: a higher ratio means a company earns substantially more from a customer than it spends to win them. A ratio around 3:1 is often cited as healthy.
The ratio divides the lifetime value of a customer by the customer acquisition cost. Lifetime value estimates the total gross profit a customer generates over their relationship with the company; acquisition cost is what was spent to win them. The ratio expresses, in a single number, how much value each acquisition dollar produces. Note, many companies will calculate LTV as the revenue generated by a customer, but gross profit is the more accurate measurement.
A ratio of roughly 3:1 is a common benchmark for a healthy recurring-revenue business: three dollars of lifetime value for every dollar of acquisition cost. Much lower suggests growth is too expensive to be sustainable; much higher can signal underinvestment, where a company could profitably spend more to grow faster.
The ratio is most useful with the CAC payback period, which measures how long it takes to recover acquisition cost. A strong ratio with a very long payback can still strain cash flow, because the value, while large, arrives slowly. Both measures together describe whether growth spending is efficient and well-timed.
A venture debt provider funding go-to-market wants confidence that capital deployed into acquisition compounds. A solid LTV:CAC ratio, paired with reasonable payback and low churn, is strong evidence that a facility put toward growth will build durable revenue.
Is a higher ratio always better? Not always. A very high ratio can mean a company is under-investing in growth and could afford to acquire more aggressively. Context matters.
How is lifetime value calculated? Typically from average revenue per customer, gross margin, and expected customer lifetime (closely tied to churn). Methods vary, so consistency across periods and companies is important in making comparisons.
Related terms: Customer Acquisition Cost (CAC) · Unit Economics · Churn Rate · Net Revenue Retention
