LTV:CAC Ratio

Around 3:1 is the widely cited healthy benchmark. Below 1:1 you lose money per customer; far above 3:1 may mean you are underspending on growth. Three is the rule-of-thumb sweet spot.

Divide customer lifetime value by customer acquisition cost. An LTV of $800 and a CAC of $200 give a 4:1 ratio. Make sure LTV uses gross margin, not revenue.

For every dollar spent acquiring a customer, you earn three dollars of lifetime gross profit. That leaves healthy margin to fund growth and operations. It is the common target for sustainable unit economics.

Not necessarily. A very high ratio, say 8:1, can mean you are under-investing in acquisition and leaving growth on the table. Within reason, you might spend more to grow faster. Balance matters.

Common traps: LTV based on optimistic churn, CAC missing salaries, or ignoring payback period. A great ratio with a two-year payback still strains cash. Check the inputs before trusting the number.

LTV:CAC tells you whether a customer is profitable eventually; payback tells you how fast you recover the cost. You want both healthy. A good ratio with slow payback can still create a cash crunch.