What Is the LTV:CAC Ratio?
The LTV:CAC ratio compares the lifetime value of a customer to the cost of acquiring them. It's the headline measure of growth efficiency: roughly 3:1 is considered healthy, below 1:1 means you lose money on every customer, and very high ratios can signal you're underinvesting in growth.
Key takeaways
- LTV:CAC = customer lifetime value ÷ customer acquisition cost.
- Around 3:1 is the common healthy benchmark; below 1:1 is unsustainable.
- Pair it with CAC payback period for a fuller efficiency picture.
How to read the ratio
| LTV:CAC | What it suggests |
|---|---|
| Below 1:1 | You lose money on each customer |
| 1:1 – 3:1 | Working, but acquisition is expensive |
| ~3:1 | Healthy, efficient growth |
| Above 5:1 | Profitable — but you may be underinvesting in growth |
Why it can be too high
A 7:1 ratio sounds great, but it often means you could profitably spend more to grow faster and aren't. In venture-backed SaaS, an extremely high ratio is frequently a signal to invest more aggressively in acquisition.
Frequently asked questions
What's a good LTV:CAC ratio?
About 3:1 is the widely cited healthy benchmark — enough margin to be profitable while still investing in growth.
How do you calculate LTV:CAC?
Divide customer lifetime value by customer acquisition cost. Use gross-margin-based LTV and a fully-loaded CAC so the ratio reflects real economics.
Can the LTV:CAC ratio be too high?
Yes — a very high ratio often means you're under-spending on acquisition and leaving growth on the table.
Related service: Model unit economics in HubSpot