Customer Acquisition Cost.
The total cost of acquiring a new customer, calculated by dividing total sales and marketing spend by the number of new customers gained in a period.
The Formula
Include all costs: ad spend, salaries, tools, agency fees, commissions, and overhead.
Definition
What is CAC and why does it matter?
Customer Acquisition Cost is the single most important metric for understanding whether your marketing is actually profitable. It tells you exactly how much you're paying to win each new customer—and whether that investment makes sense relative to what that customer is worth.
The relationship between CAC and Customer Lifetime Value (CLV) determines your unit economics. A healthy business typically maintains a CLV:CAC ratio of 3:1 or higher. If you're spending $500 to acquire a customer worth $1,500 over their lifetime, your marketing is sustainable. Below 3:1, you're burning cash.
Benchmarks
CAC by industry.
SaaS B2B
Depends on ACV
E-commerce
Category dependent
Real Estate
High-value transactions
Healthcare
Per patient
Insurance
Policy dependent
F&B
Per diner
Education
Per enrollment
Professional Services
Per client
AI Impact
How AI reduces CAC.
Smarter Targeting
AI identifies high-intent audiences and eliminates wasted ad spend on low-probability segments.
Automated Nurturing
Personalised email and SMS sequences convert leads faster with less manual effort.
Predictive Scoring
AI lead scoring routes the best prospects to sales immediately, shortening cycles and cutting overhead.
Related Terms
Keep learning.
What's your real CAC?
Most businesses undercount. Book a free audit and we'll calculate your true CAC—then show you how AI can cut it in half.
Get Your Free CAC Audit →