What is LTV and why does the LTV:CAC ratio matter?

LTV — Customer Lifetime Value — is the total gross profit a customer generates over the entire duration of their relationship with your company. The LTV:CAC ratio divides that figure by the cost of acquiring the customer. A ratio of 3:1 or higher is the standard benchmark for a healthy B2B SaaS business: you generate $3 of lifetime value for every $1 you spend on acquisition.

How do you calculate LTV?

The standard formula: LTV = (ACV × Gross Margin ÷ Annual Churn Rate). Example: $12,000 ACV, 70% gross margin, 15% annual churn rate. LTV = ($12,000 × 0.70) ÷ 0.15 = $56,000. This is a simplified model — it assumes constant ACV and churn, which is rarely true in practice. For companies with meaningful expansion revenue (seat additions, tier upgrades), LTV is higher because the customer's ACV grows over time. Net revenue retention above 100% makes the LTV calculation look very different from a company with flat or declining customer revenue.

What does a good LTV:CAC ratio look like?

Below 1:1: you’re spending more to acquire customers than they’re worth. Every new customer makes the business less valuable. 1:1 to 3:1: marginal — you’re recovering acquisition costs, but the margin is thin and leaves little room for error in execution or retention. Above 3:1: healthy business with room to invest in growth. 5:1 or higher can indicate underinvestment in acquisition — the ratio is high because you’re not spending enough to grow faster. The target is 3:1 to 5:1 for a well-optimised B2B SaaS business.

What are the levers to improve LTV:CAC?

Four levers. Reduce CAC: improve sales efficiency, tighten ICP to reduce wasted spend, use AI-assisted outbound to reduce cost-per-new-customer. Increase ACV: pricing strategy, packaging, moving upmarket. Improve retention: reduce churn by improving activation, customer success coverage, and product stickiness. Increase expansion: build upgrade paths and upsell motions that grow revenue from existing customers. The fastest single improvement is usually reducing churn — a reduction from 20% to 10% annual churn roughly doubles LTV without changing acquisition spend.

How does LTV:CAC differ from payback period?

Payback period tells you how long until you break even on a customer. LTV:CAC tells you the total return on the acquisition investment over the customer’s lifetime. Both matter. A business with a 6-month payback period but a 1.5:1 LTV:CAC ratio has fast recovery but poor long-term economics — customers churn before generating meaningful return. A business with an 18-month payback but 6:1 LTV:CAC recovers acquisition costs slowly but generates strong long-term value. Healthy businesses optimise both.