Metrics & Performance
Customer Acquisition Cost
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
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.
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.
Related Concepts
Further Reading
Follow-On Strategy for Angel Investors: When to Double Down
How to think about follow-on investments in your angel portfolio — pro-rata rights, signaling risks, reserve allocation, metrics to evaluate, and when it's smarter to walk away.
How to Evaluate a Startup as an Angel Investor
A practical framework for assessing pre-seed and seed startups — covering team, market, traction, business model, and terms. Plus the red flags that experienced angels never ignore.
What a Series A Process Actually Looks Like
The Series A is where fundraising gets real — partner meetings, deep diligence, and term sheet negotiations. Here's a realistic week-by-week breakdown of what to expect.
Corporate Venture Capital: How Big Companies Invest in Startups
A practical guide to how corporate venture capital works, how it differs from traditional VC, and how founders can evaluate and negotiate CVC investment on strategic and financial terms.
Bootstrapping vs Venture Capital: Which Path Is Right for Your Startup?
A comprehensive comparison of bootstrapping and venture capital — the economics, control trade-offs, risk profiles, and decision framework to help founders choose the right funding path.
How to Build a Financial Model for Your Startup
A step-by-step guide to building a startup financial model that impresses investors, drives decision-making, and helps you forecast growth, burn rate, and runway.
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