Customer Acquisition Cost (CAC)

What CAC actually means

CAC is what a company actually pays to turn a stranger into a paying customer. The phrase that matters is fully loaded. A real CAC includes media spend, agency retainers, software licenses and the salaries of everyone who works on acquisition. A number built only from ad spend is not CAC, it is cost per acquisition wearing a better suit, and it will flatter every ratio downstream of it.

Worked example

A B2B software company spends 240,000 dollars in a quarter: 120,000 on paid media, 60,000 on two sales reps, 40,000 on a marketer and 20,000 on tooling. It closes 80 new customers. CAC is 240,000 divided by 80, or 3,000 dollars per customer.

Why the board cares

The board reads CAC as the price of growth. Rising CAC against flat revenue means the company is buying the same outcome for more money, which usually signals channel saturation or drifting targeting. Boards rarely want CAC minimized. They want it stable and predictable enough to justify writing a bigger check, which is why a trustworthy analytics and reporting layer matters more than a clever number.

Benchmarks and rules of thumb

Healthy CAC is entirely relative to LTV and payback period. A 3,000 dollar CAC is excellent against a 40,000 dollar contract and fatal against a 900 dollar one. Never present CAC without at least one of those two companions.

Common mistakes

• Excluding salaries, retainers and tooling, which understates real CAC by 30 to 60 percent in most organizations.
• Dividing this month's spend by this month's new customers when the sales cycle is 90 days, which charges the wrong cohort for the cost.
• Reporting one blended CAC when organic and paid customers cost radically different amounts to acquire.

Related terms

• Customer Lifetime Value (LTV)
• LTV to CAC Ratio
• CAC Payback Period
• Blended CAC vs Paid CAC
• Cost Per Acquisition (CPA)

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