How to calculate the LTV to CAC ratio
The LTV to CAC ratio is the single clearest test of unit economics: how much profit a customer generates relative to what it cost to acquire them. It tells investors and operators whether growth spend is building value or burning it.
Short answer
Calculate the LTV to CAC ratio by dividing customer lifetime value by customer acquisition cost. For example, 48,000 dollars LTV divided by 12,000 dollars CAC is a 4 to 1 ratio. A ratio of 3 to 1 or higher generally signals healthy, scalable unit economics; below 1 to 1 means you lose money per customer.
Step by step
Calculate LTV correctly
Use margin-based LTV: average revenue per account times gross margin, divided by churn. A revenue-based LTV inflates the ratio.
Calculate a fully loaded CAC
Include all sales and marketing costs, including salaries and tools, divided by new customers. A skinny CAC flatters the ratio dishonestly.
- LTV to CAC = LTV / CAC
- Both inputs must be computed honestly
- 3:1 or higher is a common healthy target
Divide and interpret
Below 1 to 1 you lose money per customer. Around 3 to 1 is healthy. Far above 5 to 1 may mean you are underinvesting in growth.
Check payback period alongside it
A great ratio with a 24-month payback still strains cash. Read the ratio and payback together.
Segment the ratio
Compute it per channel and segment. A healthy blended ratio can hide a channel that loses money on every customer.
How Ardovo helps
Ardovo computes LTV and CAC from live data and reports the ratio by channel and segment, so Rook can flag exactly which acquisition source is unprofitable rather than letting a good blended number hide it.
Frequently asked questions
What is a good LTV to CAC ratio?
Around 3 to 1 is a widely used healthy benchmark. Below 1 to 1 you lose money acquiring customers. Well above 5 to 1 can indicate you are underinvesting in growth and could profitably spend more to acquire.
Why can a high LTV to CAC ratio be a warning sign?
Because it may mean you are leaving growth on the table. If every customer is highly profitable, you could likely afford to acquire more aggressively. A very high ratio can signal underinvestment rather than pure health.
Does the ratio account for cash flow?
No, which is why you pair it with payback period. A 4 to 1 ratio with an 18-month payback still ties up cash for a long time. The ratio measures profitability, payback measures how fast you recover the cost.