Customer Acquisition Cost (CAC)
CAC tallies every dollar spent to acquire new customers, from ads to salaries and tools, then divides that by the number of customers won in the same period.
CAC is total acquisition spend divided by new customers in a period.
Definition and examples
Customer Acquisition Cost (CAC) is a fundamental business metric that measures the total cost of acquiring a new customer during a specific time period. CAC encompasses all marketing and sales expenses, including advertising spend, employee salaries, software tools, agency fees, and promotional costs, divided by the number of new customers acquired in the same timeframe. This metric provides crucial insights into the efficiency and sustainability of growth strategies, serving as a cornerstone for unit economics analysis and strategic decision-making. Understanding CAC is essential for evaluating the effectiveness of different marketing channels, including email campaigns, and determining optimal resource allocation across acquisition channels. When paired with Customer Lifetime Value (LTV), CAC enables businesses to assess the long-term profitability of their customer acquisition efforts and make informed decisions about scaling marketing investments.
Why it matters
It matters because CAC tells you how efficiently your growth engine turns spend into new customers. If it rises faster than customer value, growth gets harder to sustain.
Common mistakes
A common mistake is reading the number in isolation. It becomes much more useful when you compare it over time, by segment, and against the next step in the funnel.
Related terms
Key takeaways
CAC is a fundamental metric that measures the total cost of acquiring new customers and is essential for evaluating business unit economics
Effective CAC calculation requires consistent methodology, proper cost allocation, and alignment of measurement periods with customer acquisition timelines
Healthy LTV to CAC ratios vary by business stage, with mature companies targeting 4:1 or higher ratios for sustainable growth