What Is Customer Acquisition Cost?
CAC definition, how to calculate it, and the LTV to CAC ratio explained.
Definition
Customer Acquisition Cost (CAC) is the total sales and marketing spend required to acquire one new customer, calculated by dividing total acquisition costs by the number of new customers won in the same period.
Why it matters
CAC determines whether a business model is commercially sustainable. A company that grows quickly but spends more to acquire each customer than it earns from them is not building a business — it is accelerating a loss. CAC must always be evaluated relative to LTV. A $5,000 CAC is excellent if average LTV is $25,000 and a disaster if average LTV is $4,000. CAC is also one of the most actionable metrics in outbound sales: improving ICP targeting, SDR qualification, and proposal conversion all reduce CAC without requiring additional headcount.
In practice
A B2B software company spends $60,000 in Q2 on sales salaries, agency fees, tooling, and events. They close 12 new customers. CAC is $5,000. Average contract value is $18,000 per year and average retention is 2.5 years, giving LTV of $45,000. LTV to CAC ratio is 9:1. The business increases outbound investment for Q3, confident the unit economics support it.
Frequently asked
How do you calculate CAC?
CAC is calculated by dividing total sales and marketing spend in a given period by the number of new customers acquired in that same period. All costs contributing to customer acquisition should be included: salaries, agency fees, tooling, advertising, and event costs. If a company spends $50,000 in Q1 and acquires 10 new customers, CAC is $5,000.
What is a good LTV to CAC ratio?
>A 3:1 LTV to CAC ratio is the widely accepted benchmark for a commercially sustainable subscription business. A ratio below 1:1 means the business loses money on every customer it acquires regardless of growth rate. A ratio above 5:1 may indicate underinvestment in growth. Most investors look for at least 3:1 before considering a business model proven.
What is the difference between blended CAC and paid CAC?
>Blended CAC includes all acquisition costs across all channels, including organic and referral. Paid CAC isolates only paid channel costs such as advertising and outbound agency fees. A low blended CAC can hide a high paid CAC if many customers come through organic channels. Outbound-specific CAC is the most actionable metric for evaluating SDR and outbound programme efficiency.
How do you reduce CAC?
>The most effective ways to reduce CAC are: tightening the ICP to reduce time on poor-fit prospects, improving SDR qualification to reduce deals that stall after the first meeting, increasing conversion rates at each pipeline stage, using outbound channels with a lower cost per meeting versus paid advertising, and shortening the sales cycle to reduce overhead cost per deal.
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