Customer Acquisition Cost (CAC)

Customer acquisition cost (CAC) aggregates every dollar spent to win a new customer: advertising, content production, sales salaries and commissions, marketing tools, events, and any other cost directly tied to customer acquisition. This total is divided by the number of new customers acquired in the same period.

CAC should be calculated both on a blended basis (all customers, all channels) and on a per-channel basis (paid search, organic, outbound sales, etc.). Blended CAC provides the big picture, while channel-level CAC reveals which acquisition strategies are most efficient and where to allocate marginal budget.

A rising CAC is not necessarily alarming if it comes with increasing ACV or improved retention. However, CAC that grows faster than revenue per customer is unsustainable. Founders should monitor the CAC payback period to ensure they recover acquisition costs quickly enough to reinvest in growth.