How to Calculate Customer Acquisition Cost (CAC) for Small Business

Customer Acquisition Cost, or CAC, shows how much you spend to get one paying customer. For small businesses, freelancers, ecommerce teams and startups, CAC is one of the simplest ways to understand whether marketing is working.

CAC formula

CAC = Total sales and marketing cost / Number of new customers acquired

If you spend $500 on ads, creative, sales calls and tools, and you get 25 new customers, your CAC is $20.

What to include

• Ad spend
• Creative or design cost
• Landing page or funnel cost
• Marketing software cost
• Sales commission or follow-up cost

Why CAC matters

A low CAC does not always mean the business is healthy. You should compare CAC with average order value, gross margin, repeat purchases and customer lifetime value.

Use the calculator

Use the Customer Acquisition Cost Calculator to calculate CAC, conversion rate and payback pressure quickly. You can also explore all business calculators.

Next step

If CAC is too high, improve offer clarity, landing page conversion, audience targeting, follow-up and pricing before increasing budget.