Metrics & Performance
CAC
Last updated
Quick Answer
Customer Acquisition Cost — the total cost to acquire one new customer, including sales and marketing expenses. A core unit economics metric that determines whether a business model is economically viable at scale.
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) is the total sales and marketing spend required to acquire one new customer. It is calculated by dividing total sales and marketing expenses over a period by the number of new customers acquired in that same period.
CAC = Total Sales & Marketing Spend / New Customers Acquired
CAC should be calculated on both a blended basis (all channels) and by channel (paid, organic, outbound, referral) to identify the most efficient acquisition paths. The payback period — how long it takes to recover CAC from gross profit — is the most actionable way to evaluate CAC in context.
In Practice
A SaaS company spends $200,000 on sales and marketing in Q1 (salespeople salaries, ad spend, events) and acquires 40 new customers. Blended CAC = $200,000 / 40 = $5,000. If average contract value is $1,200/year and gross margin is 70%, gross profit per customer per year = $840. CAC payback period = $5,000 / $840 = ~6 months. This is strong — sub-12-month payback is the target.
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.
Related terms point to the next useful explanation.
Why It Matters
CAC determines whether a business can grow profitably. High CAC relative to LTV means the company loses money on each customer at scale. Investors benchmark CAC payback periods: sub-12 months is excellent, 12-24 months is acceptable for enterprise, 24+ months is a red flag unless LTV is very high. Reducing CAC through product-led growth, organic content, and referrals is one of the highest-leverage activities for early-stage companies.
VC Beast Take
The most common CAC error is excluding fully-loaded costs. Founders often count only ad spend but not salesperson salaries, sales engineer time, or onboarding costs. Fully-loaded CAC is always higher than it first appears. The second mistake: looking at blended CAC without understanding which channels are efficient and which are burning money. Break CAC by channel — your best channel is probably 3-5x more efficient than your worst.
Term Family
Related concepts
Further Reading
The Only SaaS Metrics That Matter for Fundraising
Which SaaS metrics VCs actually care about at each stage. ARR, growth rate, NRR, CAC payback, and the benchmarks that separate funded from unfunded.
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.
What Happens at a Startup Board Meeting: Agenda, Dynamics, and Preparation
Board meetings are where a startup's most consequential decisions get made — or avoided. Here's what actually happens in the room, who attends, and how to run one well.
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.
Airbnb's Pitch Deck: The Original 2009 Deck That Raised $600K (PDF + Analysis)
Slide-by-slide breakdown of the 10-slide pitch deck Airbnb used to raise $600K from Sequoia Capital in 2009. What worked, what wouldn't fly today, and what every founder can steal.
Related Guides
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 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.
How to Run an Effective Board Meeting as a Startup CEO
Most CEOs walk into board meetings unprepared and walk out having wasted 3 hours. Here's how to run a board meeting that drives decisions, builds trust, and actually helps your company.
How to Do Due Diligence on a Startup: The VC's Complete Framework
The complete VC due diligence framework: team DD, market DD, product DD, financial DD, legal DD, and customer interviews. With red flags and deal-breakers for each track.
Comparisons
Related Questions
Browse all questions →Tools & Resources
Frequently Asked Questions
What is CAC in venture capital?
Customer Acquisition Cost (CAC) is the total sales and marketing spend required to acquire one new customer. It is calculated by dividing total sales and marketing expenses over a period by the number of new customers acquired in that same period.
Why is CAC important for startups?
Understanding CAC is critical for founders navigating the fundraising process. It directly impacts deal terms, valuation, and the relationship between founders and investors.
What category does CAC fall under in VC?
CAC falls under the metrics category in venture capital. This area covers concepts related to the quantitative measures used to evaluate fund and company performance.
Sources & References
Newsletter
The VC Beast Brief
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.
Related Tools
Archstone
Run your fund like an institution.