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    Glossary›CAC
    Glossary · Metric

    What is Customer Acquisition Cost (CAC)?

    Definition

    Customer Acquisition Cost (CAC) is the average cost to acquire a single new customer, calculated by dividing total sales and marketing spend by the number of customers acquired in a period. CAC includes salaries, tools, advertising, commissions, and all overhead associated with the acquisition effort. This metric directly impacts pricing strategy and is critical for determining whether a business model is sustainable and scalable.

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    EconomicsMetricsSaaSProfitabilityGrowthPayback PeriodCAC
    In short

    CAC at a glance.

    Average cost to acquire one new customer
    Includes sales, marketing, salaries, tools
    Critical profitability and scaling metric
    Should be lower than customer lifetime value

    CAC Payback and Unit Economics

    CAC payback period is the number of months until monthly profit from a customer repays the acquisition cost. A strong SaaS business recovers CAC within 12 months. If your CAC is 1000 dollars and customer brings in 100 dollars per month profit, payback is 10 months. If payback extends beyond 24 months, the business likely cannot scale efficiently or will need to improve retention or price to become viable.

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    CAC — frequently asked

    Improve channel efficiency (target higher-intent users), increase conversion rates (better messaging and UX), improve marketing velocity (faster time to conversion), or expand existing customer value. Often improving retention and expansion revenue is easier and faster than cutting CAC—a 10 percent churn reduction has similar impact to 10 percent CAC reduction.

    Measure CAC by channel (paid search, social, content, referral, etc.). Allocate more spend to lowest-CAC, highest-quality channels. But avoid over-investing in a single channel—diminishing returns and market saturation will reduce efficiency. Balanced portfolio of channels typically yields better long-term CAC than over-relying on one source.

    PLG models target 6-12 month payback and lower absolute CAC. Sales-led models can support longer payback (18-24 months) because larger ACV justifies higher CAC. On-demand course platforms might target 3-6 month CAC payback, while enterprise LMS might accept 24+ month payback for large customers.

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