How to Calculate CAC: Formula, Benchmarks, and Optimization Tips

Customer Acquisition Cost (CAC) measures exactly what it says: how much you spend, on average, to acquire a single new customer. It's one of the two variables at the center of unit economics — the other being LTV. Get CAC wrong and your entire growth model falls apart.

This guide walks through the formula, a step-by-step calculation, a worked example, the benchmarks that signal healthy economics, and the most common mistakes founders make when they present CAC to investors.

What Is CAC?

CAC is the total cost — marketing, sales, and associated overhead — required to convert a prospect into a paying customer. It accounts for everything you spend to generate revenue, not just your ad budget.

The key insight: CAC is not just your marketing spend. It includes sales salaries, commissions, tooling, SDR time, and any other resource consumed in the customer acquisition process.

The Formula

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CAC = Total Sales & Marketing Spend

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Number of New Customers Acquired

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Both figures should cover the same time period (typically a month or quarter). The spend should include:

• Marketing team salaries and benefits
• Sales team salaries, commissions, and bonuses
• Ad spend (paid search, social, display)
• Content production costs
• Marketing tools and software (CRM, marketing automation, analytics)
• Events, tradeshows, and sponsorships
• Agency and contractor fees related to acquisition

Step-by-Step Calculation Walkthrough

Step 1: Define your time period.

Use a quarter for B2B (longer sales cycles require more time to normalize) or a month for high-velocity B2C. Be consistent.

Step 2: Sum all sales and marketing expenses.

Pull your P&L. Include every dollar that touches the acquisition funnel — salaries, commissions, tools, ad spend, events. Exclude customer success costs (those belong in retention).

Step 3: Count new customers acquired in the same period.

Only count net new logos or new paying users — not expansions, upsells, or reactivations.

Step 4: Divide spend by customers.

The result is your blended CAC.

Step 5: Segment by channel.

Calculate CAC separately for paid search, outbound sales, content/SEO, and partnerships. This tells you which channels are efficient and where to double down.

Worked Example

A mid-market SaaS company's Q1 sales and marketing spend:

New customers acquired in Q1: 22

CAC calculation: