What is Customer Acquisition Cost (CAC)?

Customer Acquisition Cost, abbreviated CAC, is the average cost a company incurs to acquire one new customer. It is calculated by dividing total acquisition spend, typically marketing and sales costs, by the number of new customers gained in the same period.

Definition

CAC includes media spend, agency fees, content production, and the share of sales and marketing salaries dedicated to acquisition. Some teams calculate a fully loaded CAC that adds tooling and overhead; others stick to media plus campaign costs. Whatever the formula, it should be consistent across periods so trends are comparable.

Why it matters

CAC is the cost side of the acquisition economic equation. Paired with customer lifetime value, it shows whether the business is viable: an LTV-to-CAC ratio above three is a common rule of thumb, though it varies by category. Rising CAC without a matching rise in LTV is the most common warning sign in growth-stage commerce businesses.

Levers

The levers to manage CAC fall into two groups: getting more customers from the same spend, and spending less per acquired customer. The first involves conversion rate optimization, faster pages, better personalization, and stronger creative. The second involves channel mix, audience targeting, and improving organic and referral contributions. A high-performing frontend supports both, because fewer visitors drop off in the funnel.