LTV:CAC Ratio
The LTV:CAC ratio compares the lifetime value a customer generates against the cost to acquire them. It tells you whether your acquisition spend produces profitable customers.
In depth
To calculate the ratio you divide customer lifetime value (average revenue per customer multiplied by gross margin and expected lifespan) by customer acquisition cost (total sales and marketing spend divided by new customers won). A ratio around 3:1 is the common SaaS benchmark: below 1:1 you lose money on every customer, while a very high ratio like 6:1 often signals you are underinvesting in growth and leaving market share on the table. The metric matters because it converts two volatile numbers into a single judgment about whether your growth engine is sustainable.
A common pitfall is treating LTV as a fixed input when churn, expansion revenue, and discount levels constantly move it. In a quiz-funnel and lead-qualification workflow, the ratio improves when you let a scorecard pre-qualify visitors, because passing only high-fit leads to sales lowers wasted CAC and raises the LTV of the cohort that actually converts. Tracking the ratio per funnel source then shows which campaigns deliver customers worth keeping rather than just cheap signups.
Example in practice
Frequently asked questions
What is a good LTV:CAC ratio?
A ratio of about 3:1 is the widely cited healthy benchmark for SaaS. Below 1:1 you lose money per customer, and far above 5:1 usually means you could grow faster by investing more in acquisition.
How do I improve a low LTV:CAC ratio?
You can lower CAC by qualifying leads before sales touches them and raise LTV by reducing churn and expanding existing accounts. Better targeting at the top of the funnel usually moves both numbers at once.
How often should I recalculate the ratio?
Review it at least quarterly, and segment it by acquisition channel. Because churn and ad costs shift constantly, a blended annual number can hide unprofitable channels.