Quick definition
Customer acquisition cost (CAC) is the total sales and marketing spend needed to win one new customer, found by dividing that spend by new customers gained.
Metrics
Part of the SocialKit social media glossary — browse every term.
Customer acquisition cost, or CAC, measures how much it costs to convert a prospect into a paying customer. It is calculated by adding up all sales and marketing costs over a period — ad spend, content, salaries, tools — and dividing by the number of new customers acquired in that same period. CAC is a foundational metric for any business that spends to grow, because it defines the price of growth. A business can only scale sustainably if the value each customer brings comfortably exceeds what it cost to acquire them.
Social media influences CAC in two directions. Organic social — content that builds audience and drives traffic without direct spend — can lower blended CAC by generating customers marketing budget didn’t directly pay for. Paid social adds measurable cost that feeds directly into the calculation. Marketers attribute acquisitions back to channels to see which platforms produce customers most efficiently, and a strong organic presence is often justified precisely because it reduces dependence on paid acquisition and the rising costs that come with it.
CAC is most meaningful next to customer lifetime value: the LTV-to-CAC ratio shows whether the economics work, since paying more to acquire a customer than they will ever spend is unsustainable. Average order value and payback period matter too — how long it takes revenue from a customer to recover their acquisition cost. Because attribution is imperfect, treat CAC as a directional trend rather than a precise figure, and segment it by channel to find where your marketing spend, including each social platform, buys customers most efficiently.
Where SocialKit fits
SocialKit doesn’t run ad campaigns, but by helping you build and sustain an organic presence across all 11 platforms from one calendar, it supports the kind of owned audience growth that can lower your blended customer acquisition cost over time.
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FAQ
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SocialKit posts to all 11 platforms from one calendar and tracks how every post performs, so the numbers explain themselves. Try it free for 7 days.
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