LTV:CAC Ratio

What is LTV:CAC Ratio?

The LTV:CAC ratio compares how much a customer is worth over their lifetime to how much it costs to acquire them. A ratio of 3:1 means every dollar spent on acquisition returns three dollars in customer revenue.

The widely accepted benchmark for healthy SaaS businesses is an LTV:CAC ratio of 3:1 or higher. A ratio below 1:1 means you're losing money on every customer. A ratio above 5:1 might mean you're underinvesting in growth, you could afford to spend more on acquisition and grow faster.

LTV:CAC is the single metric that best captures whether a business model works. It combines retention (via LTV), pricing (via LTV), and go-to-market efficiency (via CAC) into one number.

Why it matters

LTV:CAC is the metric that tells you whether to accelerate or pump the brakes. A high ratio (4:1+) means pouring money into acquisition is a great investment, every dollar yields four in return. A low ratio (1.5:1 or below) means you need to improve retention or pricing before scaling.

Investors love this metric because it predicts the future. A startup with a 4:1 LTV:CAC ratio and a clear acquisition channel can confidently project profitable growth. A startup with a 1.2:1 ratio is one bad month from losing money on every customer.

Formula

LTV:CAC Ratio = Customer Lifetime Value / Customer Acquisition Cost

Example

Common mistakes

• 1Using revenue-based LTV instead of gross-margin-based LTV (the latter is more accurate because it subtracts delivery costs)
• 2Not calculating LTV:CAC by customer segment (your enterprise segment might be 5:1 while SMB is 1.5:1)
• 3Treating LTV:CAC as a static number instead of tracking it over time