Marketing & Growth

Customer Acquisition Cost CAC

CMO CFO VP Marketing Director Marketing

Customer Acquisition Cost (CAC) measures the total sales and marketing expenditure required to acquire one new paying customer over a given period. It encompasses all costs including ad spend, salaries, tools, and agency fees divided by the number of new customers gained. Tracking CAC helps organizations assess the efficiency and scalability of their growth engine.

CAC should always be evaluated alongside Customer Lifetime Value (LTV) to understand whether growth is economically sustainable.

Formula

Total Sales & Marketing Spend ÷ New Customers Acquired

Where It Lives

HubSpotCampaign spend and closed-deal attribution
SalesforceClosed-won data and sales costs
Google AdsAd spend and conversion tracking
StripeNew customer revenue and first payment date

What Drives It

Ad auction competition inflating cost per click
Landing page conversion rate changes
Sales team close rate shifts
Channel mix moving toward more expensive sources
Increased time-to-close lengthening sales costs

Benchmark

SaaS companies typically target an LTV:CAC ratio above 3:1; CAC payback under 12 months is generally considered healthy.

Common Questions About Customer Acquisition Cost

What costs should be included in CAC?

CAC should include all sales and marketing expenses: advertising spend, salaries and benefits for sales and marketing staff, software and tool costs, agency and contractor fees, and event costs. Excluding any of these understates the true cost. Some companies also allocate a portion of overhead, though the most common practice is to use fully-loaded sales and marketing costs only.

How often should CAC be calculated?

CAC is most meaningful when calculated monthly or quarterly with a consistent time-window methodology. Because there is often a lag between spend and the moment a customer is acquired, many teams use a blended trailing-90-day calculation. Tracking it monthly allows you to catch trend changes early.

What is blended CAC vs. channel CAC?

Blended CAC divides total spend across all channels by total new customers, giving a single company-wide number. Channel CAC isolates spend and customers by acquisition source (e.g., paid search, content, outbound). Channel CAC is more actionable for optimization, while blended CAC is used for financial modeling and investor reporting.

How does CAC differ for inbound vs. outbound motions?

Outbound CAC tends to be higher because it requires SDR and sales rep time to generate demand that does not exist organically. Inbound CAC benefits from compounding content and SEO investment, but the full cost of content creation and SEO tooling must be included for the comparison to be fair.

Related Metrics

LTV | Customer Lifetime Value LTV:CAC | LTV:CAC Ratio CAC Payback Period | CAC Payback Period ROAS | Return on Ad Spend

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