LTV to CAC Ratio
Definition
The LTV to CAC ratio compares the lifetime value of a customer to the cost of acquiring them. A ratio of 3:1 is considered the benchmark for healthy SaaS economics, meaning each customer generates three times more value than the cost to acquire them, leaving room for operating costs and profit.
Formula
Overview
The LTV:CAC ratio is the single most cited unit economics metric in SaaS. It answers a straightforward question: for every dollar invested in acquiring a customer, how many dollars does the business get back over that customer's lifetime?
A ratio below 1:1 means you are losing money on every customer, a model that only works if you expect to dramatically improve retention or expand revenue later. A ratio of 1 to 3:1 suggests the economics are tight and there may not be enough margin to cover operating costs. A ratio of 3:1 or higher is the gold standard, indicating healthy margins and a scalable model.
However, a very high LTV:CAC ratio (above 5:1) may indicate underinvestment in growth. If your unit economics are this strong, you could likely spend more aggressively on acquisition and still maintain healthy returns. Investors may see an extremely high ratio as a missed opportunity to grow faster.
Example
LTV of $3,000 and CAC of $900 yields an LTV:CAC ratio of 3.3:1, above the 3:1 benchmark.
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