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Glossary · Unit Economics

Customer Acquisition Cost

By · 2 October 2026

Customer acquisition cost (CAC) is the total spend needed to win one new paying customer, usually ad spend plus any sales costs, divided by the number of customers won.

How do you calculate CAC for a sales call funnel?

Divide the ad spend for a period by the number of clients closed from it. On a brand-new agency offer I worked on, $35,076 in ad spend closed 24 clients, a customer acquisition cost of about $1,460 in ad spend per client. Add setter and closer commissions if you want the fully loaded number.

When is CAC too high?

When the first payment doesn't cover it and the customer doesn't stay long enough to make it back. Here's the scenario I see most in SaaS:

Line Amount
Plan price $79 a month
Ad spend to land one account $300
Balance on day one Negative $140 (two seats)
After running costs Around negative $210
Break-even About 3.1 months

If that customer churns in month two, you never see the $210 back. The problem isn't the targeting. It's that a low price can't tolerate the CAC the auction demands.

How do you fix a CAC problem?

Raise what a customer pays you early, rather than chasing a cheaper click. In 2026, the business that can pay the most to acquire a customer wins the auction. For high-ticket offers that's built in: at a $7,000 average deal, a $1,460 CAC still leaves most of the first payment as margin. For SaaS, sell onboarding as a paid done-for-you service first, so acquisition pays for itself on day one.

FAQ

Is CAC the same as cost per booked call?

No. Cost per booked call is what one sales conversation costs. CAC is what one paying customer costs, so it also depends on your show rate and close rate.

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