Metrics & Performance
Customer Acquisition Cost
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Quick Answer
The total cost of acquiring a new customer, including all sales and marketing expenses.
Customer Acquisition Cost
CAC = Total Sales & Marketing Spend / New Customers Acquired
Where
- S&M Spend
- = Total sales and marketing expenses in a period
- New Customers
- = Number of new customers acquired in the same period
What it is
Customer Acquisition Cost (CAC) measures the total cost of winning a new customer, calculated by dividing total sales and marketing spend by the number of new customers acquired in a period. Blended CAC includes all customers (organic and paid), while paid CAC focuses only on paid channels. CAC is most meaningful when compared to Lifetime Value (LTV) — the LTV:CAC ratio should typically exceed 3:1 for sustainable growth.
In Practice
A company spends $500K on sales and marketing in a quarter and acquires 50 new customers. CAC = $500K / 50 = $10K per customer. With $36K LTV, the LTV:CAC ratio is 3.6x.
Operational context
What good looks like
The term is tied to a real workflow, not just a definition.
Ownership, timing, and evidence are clear.
The reader can tell what decision the concept supports.
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Why It Matters
CAC determines whether growth is economically sustainable. Rising CAC signals market saturation or inefficient go-to-market, while declining CAC suggests strengthening brand or product-led growth.
VC Beast Take
CAC is where most pitch decks start getting creative with their math. Founders love to exclude certain marketing costs or use blended CACs that hide their paid acquisition reality. Experienced investors always dig into cohorted CAC by channel and time period—the companies with truly sustainable unit economics can show this granular breakdown without flinching.
Related tools and reading
Term Family
Related concepts
Further Reading
LTV: What Lifetime Value Means in Venture Capital
LTV (Lifetime Value) measures the total revenue a business expects to earn from a single customer over the entire relationship. Here's what it means, how to calculate it correctly, and why the LTV:CAC ratio is the most important unit economics benchmark in SaaS.
Product-Market Fit: What It Really Means and How to Find It
Product-market fit is the single most important milestone for any startup. This complete guide breaks down what PMF actually means, how to measure it, how VCs evaluate it, and what to do once you've found it — with real examples from Slack, Dropbox, Superhuman, and Notion.
How to Calculate LTV:CAC Ratio: The Unit Economics Formula VCs Care About
The LTV:CAC ratio is the single most important unit economics metric for venture-backed startups. Here's exactly how to calculate it and what benchmarks signal a fundable business.
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Related Questions
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Frequently Asked Questions
What is Customer Acquisition Cost in venture capital?
Customer Acquisition Cost (CAC) measures the total cost of winning a new customer, calculated by dividing total sales and marketing spend by the number of new customers acquired in a period. Blended CAC includes all customers (organic and paid), while paid CAC focuses only on paid channels.
Why is Customer Acquisition Cost important for startups?
Understanding Customer Acquisition Cost is critical for founders navigating the fundraising process. It directly impacts deal terms, valuation, and the relationship between founders and investors.
What category does Customer Acquisition Cost fall under in VC?
Customer Acquisition Cost falls under the metrics category in venture capital. This area covers concepts related to the quantitative measures used to evaluate fund and company performance.
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