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
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.
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.
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.
50+ Venture Capital Interview Questions by Role (With Sample Answers)
Preparing for a VC interview? Here are 50+ real questions organized by role — Analyst through GP — with sample answer frameworks from people who've been on both sides of the table.
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.
CAC: What Customer Acquisition Cost Means in Venture Capital
CAC (Customer Acquisition Cost) is the metric VCs use to assess go-to-market efficiency. Here's what it means, how to calculate it correctly, what good benchmarks look like, and how it interacts with LTV to determine business viability.
How to Calculate LTV: Customer Lifetime Value Formula Explained
LTV tells you how much revenue a customer generates over their entire relationship with your company. Here's the formula, a worked example, and what benchmarks VCs use.
Unit Economics Explained: CAC, LTV, and Payback Period
Everything founders need to know about unit economics. How to calculate CAC, LTV, and payback period, with benchmarks VCs use to evaluate your business.
Comparisons
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.
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