LTV:CAC Ratio
The ratio of customer lifetime value to customer acquisition cost, measuring how much value you generate per dollar spent on acquisition. The north-star efficiency metric for SaaS go-to-market.
The Ratio That Rules SaaS
LTV:CAC is the single most important ratio in SaaS economics. It answers a simple question: for every dollar you spend acquiring a customer, how many dollars do you get back? If the answer is less than three, your business model has a problem.
How to Calculate It
Divide your customer lifetime value by your customer acquisition cost. Both numbers should be fully loaded — LTV should be gross-margin-adjusted, and CAC should include all sales and marketing costs.
LTV:CAC = (ARPU x Gross Margin / Churn Rate) / (Total S&M Spend / New Customers)
What the Ratio Actually Tells You
| Ratio | What It Means | Action |
|---|---|---|
| Below 1:1 | Losing money on every customer | Fix immediately or shut down |
| 1:1 to 3:1 | Unprofitable growth | Optimize channels, reduce churn |
| 3:1 to 5:1 | Healthy, efficient growth | Scale what works |
| Above 5:1 | Under-investing in growth | Spend more on acquisition |
The Nuance Nobody Talks About
A 10:1 ratio sounds amazing until you realize it might mean you are leaving millions in revenue on the table. If your LTV:CAC is that high, you can afford to acquire customers through more expensive channels — outbound, events, partnerships — and still maintain healthy economics. The ratio is a guide, not a trophy.
Companies with extremely high ratios are often in the early stages of growth, relying heavily on founder-led sales and word of mouth. Those channels do not scale forever. When they add paid acquisition, the ratio normalizes. That is not a problem — it is expected.
Frequently Asked Questions
What is a good LTV:CAC ratio?
3:1 is the standard benchmark. Below 3:1 means you are spending too much to acquire customers relative to what they are worth. Above 5:1 could mean you are under-investing in growth and leaving market share on the table. Between 3:1 and 5:1 is the sweet spot for most B2B SaaS companies.
How do you improve LTV:CAC ratio?
Two sides of the equation. Reduce CAC by improving conversion rates, optimizing channels, or shifting to lower-cost acquisition methods like content and referrals. Increase LTV by reducing churn, driving expansion revenue, or improving gross margins. Most companies over-index on CAC reduction when LTV improvement often has bigger impact.
Should you calculate LTV:CAC by channel?
Absolutely. Your blended ratio might look healthy at 4:1, but if paid search is 1.5:1 and organic is 8:1, you are subsidizing an unprofitable channel with a profitable one. Calculate per-channel LTV:CAC to know which motions to scale and which to cut.
