Customer acquisition cost (CAC) is the total expense required to acquire one new customer, calculated by dividing all sales and marketing expenses by the number of new customers acquired during a specific period. Understanding CAC is essential for determining marketing ROI and sustainable growth rates.
CAC Calculation Formula
CAC = (Total Sales & Marketing Expenses) ÷ (Number of New Customers Acquired)
Example: If you spend $10,000 on marketing and sales in a month and acquire 50 new customers, your CAC is $200 per customer.
What to Include in Calculations
- Salaries and commissions for sales and marketing teams
- Advertising spend across all channels (paid search, social, display)
- Marketing software and tools subscriptions
- Content creation and design costs
- Agency fees and freelancer payments
- Exclude: customer service, product development, overhead
Practical Application
Calculate customer acquisition cost by channel to identify your most efficient marketing investments. Compare CAC against customer lifetime value (LTV)—a healthy ratio is 1:3 or higher, meaning customers generate at least three times their acquisition cost in revenue.
Track CAC monthly to spot trends. Rising CAC might indicate market saturation, increased competition, or inefficient campaigns requiring optimization. Segment CAC by customer type, geography, or acquisition channel for deeper insights.
Use CAC to set marketing budgets and forecast growth. If your CAC is $200 and LTV is $1,000, you can confidently invest in scaling channels with proven unit economics. Review CAC quarterly alongside retention metrics—acquiring customers cheaply matters less if they don't stay.
