CAC:LTV Ratio Calculator

A CAC:LTV ratio calculator compares customer lifetime value with customer acquisition cost. It helps SaaS, subscription, and growth teams see whether the revenue expected from a customer is strong enough to justify the cost of acquiring that customer.

Divide customer lifetime value by customer acquisition cost. For example, if LTV is $2,000 and CAC is $500, the LTV:CAC ratio is 4.0x, meaning each dollar spent on acquisition is expected to return four dollars in lifetime value.

Many SaaS teams use 3:1 as a healthy benchmark because it suggests acquisition spend is creating meaningful long-term value. Ratios near 1:1 are usually marginal, while very high ratios can sometimes mean the company may be underinvesting in growth.

Use fully loaded CAC when possible, including sales and marketing spend tied to acquiring new customers. For LTV, use a consistent lifetime value model based on revenue, gross margin, retention, and customer lifespan so the ratio is comparable over time.

Improve the ratio by reducing acquisition costs, increasing conversion rates, raising retention, expanding accounts, improving gross margin, or lifting average revenue per account. Review cohorts separately because blended CAC and LTV can hide weak channels.

Use blended CAC:LTV for a company-level view and channel-level CAC:LTV for budget decisions. Paid search, outbound, partners, and organic demand can have very different payback profiles, so channel-level analysis is better for allocation.