Metrics & Performance
Last updated
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
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.
What good looks like
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 concepts
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.
Best Cap Table Management Software in 2026: Carta vs Pulley vs AngelList
A 2026 guide ranking the best cap table management software for founders and fund managers. We compare Archstone, Carta, Pulley, AngelList Stack, Ledgy, and Capshare on pricing, features, strengths, and weaknesses, with a clear pick for every stage.
What Happens When a Startup Runs Out of Money: Every Option Explained
Running out of money doesn't automatically mean the end. But it does mean a founder faces a set of difficult decisions under time pressure. Here's every option available and what each one actually involves.
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 Prepare for Series A: The Founder's Readiness Checklist
Series A fundraising fails before the first investor meeting. It fails because founders start the process before they're ready. Here's the complete readiness framework — metrics, materials, legal cleanup, and a 30-item checklist.
How to Get a 409A Valuation: Process, Cost, and Providers Compared
A 409A valuation isn't optional — it's a legal requirement that protects your employees and your company. Here's the full process, what it costs, and how to choose a provider.
How to Build an LP Pitch Deck for Your First Fund
Most first-time fund managers build LP decks that look like founder pitch decks. That's a mistake. Here's exactly what institutional and HNW LPs want to see, section by section.
How to Calculate and Optimize Your Startup's Burn Rate
Burn rate is the single most important number a startup CEO watches. Here's how to calculate gross and net burn, model runway, and know when you're in trouble before your investor does.
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.
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.
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.
Newsletter
Fund operations, one problem a week — plus benchmarks from 75,000+ SEC filings. Every Tuesday.
The VC Beast Brief
The weekly brief for emerging managers and founders
Weekly intelligence on fundraising, VC strategy, and the signals that matter. Every Tuesday, free.
Archstone
Run your fund like an institution.