CAC (Customer Acquisition Cost)
The total cost to acquire a new customer, including all sales and marketing expenses.
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Definition
Customer Acquisition Cost (CAC) measures the total investment required to acquire a single new customer. It includes all sales and marketing expenses: advertising, content creation, sales team salaries, tools, events, and overhead allocated to the acquisition function.
CAC is most meaningful when segmented by channel (organic vs. paid), customer segment (SMB vs. enterprise), and time period. Blended CAC can mask important dynamics — organic CAC is typically 40-60% lower than paid CAC, and enterprise CAC can be 5-10x higher than SMB.
CAC should always be evaluated relative to LTV (Lifetime Value). A high CAC is acceptable if LTV is proportionally high. The industry standard for a healthy business is an LTV:CAC ratio of 3:1 or better.
Why It Matters for Founders
CAC determines whether your growth is sustainable. A company that spends $500 to acquire a customer generating $200 in lifetime value will eventually run out of money, no matter how fast it grows. Understanding CAC by channel and segment helps you allocate capital to your most efficient acquisition engines.
For startups raising capital, CAC efficiency is a key investor metric. Declining CAC over time (through brand effects, word-of-mouth, and content compounding) signals a maturing business. Rising CAC is a red flag that requires strategic intervention — improving conversion rates, investing in organic channels, or building product-led growth loops.
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Formula
CAC = Total Sales & Marketing Spend / Number of New Customers AcquiredReal-World Example
A startup spends $50,000 on marketing and $30,000 on sales in Q1, acquiring 200 new customers. Their CAC is $80,000 / 200 = $400 per customer.
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Frequently Asked Questions
What is a good CAC?+
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