CAC meaning — Customer Acquisition Cost

What is CAC?

CAC (Customer Acquisition Cost) is the total sales and marketing spend required to win one new customer. Divide everything spent on acquisition in a period — salaries, commission, advertising, tooling, events, content — by the number of new customers acquired in that period. The number is only meaningful next to two others. LTV:CAC compares the lifetime value of a customer to what it cost to get them; 3:1 is the conventional floor. CAC payback measures how many months of gross-margin revenue it takes to earn the money back, and most SaaS businesses target under twelve to eighteen months. CAC also has to be segmented: blending an enterprise motion with a self-serve one produces an average that describes neither, and hides the segment that is actually unprofitable.

When to use CAC

• Deciding where to invest incremental sales and marketing budget
• Board reporting and unit-economics analysis
• Comparing the efficiency of self-serve, inbound and outbound motions

Real examples

• $300K quarterly sales and marketing spend ÷ 20 new customers = $15K CAC.
• Payback: $15K CAC against a $50K ACV at 75% gross margin = roughly 4.8 months.
• Segmented: $2K self-serve CAC versus $40K enterprise CAC — the blended $15K describes neither.

Common mistakes

• Excluding salaries and commission, which are usually the largest component.
• Blending segments with completely different motions into one average.
• Ignoring the lag between spend and the deals it produces, especially with long sales cycles.
• Optimising CAC down by cutting acquisition spend while growth stalls.

Want to practice CAC live? Run a roleplay with an AI buyer.