What is Customer Acquisition Cost (CAC)?
Customer Acquisition Cost is the total cost of acquiring a new customer, including all marketing spend, sales team salaries, tools, and overhead divided by the number of new customers acquired in that period.
Customer Acquisition Cost is the total cost of acquiring a new customer, including all marketing spend, sales team salaries, tools, and overhead divided by the number of new customers acquired in that period.
CAC = (Total Sales & Marketing Spend) ÷ (New Customers Acquired)
CAC varies dramatically by business model: B2C SaaS averages $50-200, B2B SMB averages $200-2,000, B2B enterprise averages $5,000-50,000+. The channel mix matters — organic/inbound CAC is typically 3-5x lower than paid/outbound CAC.
CAC payback period — the number of months it takes for a customer's revenue to recoup their acquisition cost — is equally important. A $10,000 CAC with 12-month payback is healthy. A $10,000 CAC with 36-month payback is capital-intensive and risky.
Why It Matters
CAC determines how capital-efficient your growth is. If CAC exceeds LTV, every new customer loses money. If CAC payback exceeds 18 months, you need significant upfront capital to fund growth.
How to Measure
1. **Blended CAC**: Total S&M spend ÷ total new customers.
2. **Channel CAC**: Break down by acquisition channel (organic, paid, partnerships).
3. **CAC Payback**: CAC ÷ (monthly revenue per customer × gross margin %).
4. **LTV:CAC Ratio**: Customer lifetime value ÷ CAC. Target: 3:1 or higher.
5. **CAC Trend**: Track quarterly to ensure efficiency is improving.
Frequently Asked Questions
What is a good CAC for SaaS?
It depends on ACV. The benchmark is LTV:CAC ratio of 3:1 or higher. CAC payback should be under 18 months. For B2B enterprise, CAC of $5K-20K with 12-month payback is healthy.
How do you reduce CAC?
Invest in organic channels (content, SEO, product-led growth), optimize conversion rates, improve sales efficiency, and expand through word-of-mouth.
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Richard Ewing is a Product Economist and AI Capital Auditor. He helps companies translate technical complexity into financial clarity.
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