Customer Acquisition Cost (CAC)

Customer Acquisition Cost, commonly known as CAC, is a key performance metric that quantifies the average investment needed to convert a prospect into a paying customer. In e-commerce, it encompasses all marketing expenditures (advertising, SEO, social media, email campaigns) and sales costs divided by the number of new customers gained over a specific period. Understanding your CAC is essential for any online store aiming to build a sustainable business, as it directly affects net margins and the ability to scale operations profitably.

The CAC formula is straightforward: divide total acquisition costs by the number of new customers acquired. For instance, if you spend $10,000 on marketing in a month and gain 200 new customers, your CAC is $50. A healthy CAC varies by industry, but in e-commerce, it should generally be less than one-third of the customer lifetime value (LTV). An LTV-to-CAC ratio above 3 signals a sustainable and scalable business model, while a ratio below 1 indicates unsustainable spending.

To optimize your CAC, it is essential to track this metric by acquisition channel so you can identify the most cost-effective strategies and reallocate budgets accordingly. Fullmetrix enables PrestaShop, WooCommerce, and Shopify merchants to centralize their marketing and sales data to calculate precise CAC figures by channel, campaign, and time period. By combining these insights with real profit tracking, margin analysis, and ROAS data, you gain a comprehensive view of the return on every dollar invested in customer acquisition.