Customer Acquisition Cost (CAC)
The total cost a business spends on sales and marketing to acquire a single new customer.
Customer acquisition cost (CAC) is a business metric that calculates the total amount spent to win a new customer. It includes all marketing expenses, sales team salaries, tools, advertising, and overhead divided by the number of customers acquired in a given period. CAC is a foundational unit economics metric — investors, CFOs, and growth teams use it to evaluate whether a business can scale profitably.
The relationship between CAC and testimonials is significant. Businesses with strong social proof programs — video testimonials, customer reviews, case studies, and Wall of Love pages — consistently report lower CAC because their conversion rates are higher and word-of-mouth generates free acquisition. When your existing customers sell for you through authentic endorsements, you spend less on paid channels.
Healthy CAC benchmarks vary by industry. SaaS companies typically target a CAC that is recovered within 12-18 months through customer revenue (the LTV:CAC ratio should be at least 3:1). E-commerce businesses aim for first-order profitability or recovery within 2-3 purchases.
Strategies for reducing CAC include optimizing landing page conversion rates with testimonials, building organic social proof that generates referral traffic, repurposing video testimonials as ad creative (which typically outperforms stock content), and creating customer advocacy programs that turn satisfied users into active promoters. Every percentage point improvement in conversion rate directly reduces CAC.
Frequently Asked Questions
What is a good LTV to CAC ratio?
A healthy LTV:CAC ratio is generally 3:1 or higher, meaning each customer generates at least three times the revenue it cost to acquire them. A ratio below 1:1 means you are losing money on every customer. Ratios above 5:1 may indicate under-investment in growth. Testimonials help improve this ratio by lowering CAC through higher conversion rates.
How does social proof reduce CAC?
Social proof reduces CAC in three ways: it increases conversion rates on paid traffic so you get more customers per dollar spent, it generates free organic traffic through word-of-mouth and shared content, and it shortens sales cycles in B2B by building trust faster. Video testimonials used as ad creative also tend to achieve lower cost-per-click than generic ads.
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