The LTV: CAC ratio compares the lifetime value of a customer to what it cost to acquire them. You divide customer lifetime value by customer acquisition cost. A ratio of 3:1 means each customer returns three times their acquisition cost and is a common benchmark for a sustainable model.

This is the single ratio that tells you if your growth engine is economically sound. Below 1:1, you lose money on every customer. Around 3:1 is healthy. Far above 5:1 usually means you are underinvesting in growth and leaving market share on the table. It is a balance, not a maximize-it number.

Example:

 Customer lifetime value is $18,000, and CAC is $6,000. LTV: CAC is 18,000 / 6,000 = 3:1.

What is a good LTV: CAC ratio?

 Around 3:1 is the widely used benchmark for a sustainable business. Below that, acquisition is too expensive. Well above 5:1 can signal you are not investing enough in growth.

Can LTV: CAC be too high?

 Yes. A very high ratio often means you are spending too little on acquisition and could capture more of the market by investing more.