What is Customer Acquisition Cost (CAC) and How Do You Calculate?

Pricing tiers, product features, market size — there’s no shortage of valuable metrics when it comes to evaluating the health of a business. But one of the most important key performance indicators (KPIs) is customer acquisition cost (CAC). CAC represents the total financial outlay a company makes to get a single, new paying customer. It’s a measure of efficiency, and without a sustainable one, even the most innovative product or service is bound to struggle.

It’s crucial to distinguish CAC from similar metrics like costs of goods and services (COGS) and ad spend. CAC is a comprehensive metric that includes all human, technical, and media costs associated with marketing and sales. In this guide, we cover the formula for calculating CAC, explain its essential relationship with customer lifetime value, and detail actionable strategies to lower your cost of acquiring a customer.

Why CAC Matters

CAC is a crucial metric for several reasons:

• Sustainability: If your cost to acquire a customer exceeds the revenue that customer generates, your business is effectively losing money on every sale.
• Profitability check: CAC determines your payback period — how long it takes for a customer’s revenue to cover the upfront acquisition expense. A shorter payback period means faster positive cash flow.
• Investor interest: Investors and stakeholders view CAC as a proxy for the scalability and efficiency of your Go-To-Market (GTM) strategy. A high CAC can make it hard to scale a business.

The long-term strategic control shouldn’t be to just maintain a low CAC, but to keep it on a downward trend relative to growth. This shows that your company is becoming more efficient, often through better organic marketing, improved product-market fit, or higher conversion rates.

How to Calculate CAC

The simple formula to calculate CAC is just:

Customer Acquisition Cost = Total Sales & Marketing Expenses / Number of New Customers Acquired

You just divide the total money spent on acquisition-related activities by the total number of new customers gained during that same period. So, if in one quarter a company spends $50,000 on marketing and sales and acquires 1,000 new customers, the CAC for that quarter is $50.

If you’re thinking, “That sounds way too simple,” well, you’re kind of right. To achieve an accurate, fully loaded CAC, you need to include every associated fixed and variable cost, and that’s not always easy to calculate. To give you a jumping off point, consider these sales and marketing costs:

• Marketing costs: Paid advertising (PPC, social, display), costs for SEO tools, content creation and distribution, PR fees, marketing automation software subscriptions, and the salaries and commissions of the marketing team.
• Sales costs: The full salaries, commissions, and bonuses paid to the sales team, plus expenses like CRM software, sales enablement tools, and any travel or entertainment directly related to closing new deals.

While a simple CAC might only include direct ad spend, a fully loaded CAC is a more accurate measure of efficiency that accounts for all hidden costs, including overhead, software, and salaries.

One crucial exclusion to note, however: Costs related to servicing or retaining existing customers—such as customer success salaries, onboarding specialists, or retention-focused marketing. These should be factored into your COGS or customer success budget.

How to Benchmark CAC

CAC on its own is relatively meaningless. To be truly effective, you need to pair it with the Lifetime Value (LTV) of your customer. LTV is the estimated total amount of money a customer is expected to spend on your product or service during their entire relationship with your company.

The simplest way to calculate LTV is:

Lifetime Value = Average Purchase Value x Purchase Frequency x Customer Lifespan

To truly understand efficiency, you need to determine your LTV:CAC ratio. This ratio answers the question: “For every dollar we spend acquiring a customer, how many dollars do we get back over that customer’s life?”

Benchmarks for Success:

• Below 1:1: You’re losing money on every customer
• 1:1 to 3:1: You’re barely profitable or are taking too long to recoup costs.
• 3:1 to 5:1: You’re financially health and generating a sustainable profit per customer.
• 5:1+: You may be under-spending and missing out on market share.

How to Lower and Optimize CAC

Since the LTV:CAC ratio is so crucial, an effective business strategy should seek to increase LTV and decrease CAC. There are several ways to do that.

Improve Conversion Rates

The most immediate way to drop CAC is to make your existing traffic convert better. If you only need 50 clicks instead of 100 clicks to get a paying customer, your CAC instantly halves.

If you’re selling online, make sure every landing page is hyper-focused, loads quickly, has clear calls-to-action, and addresses the visitor’s pain points immediately. Brick-and-mortar stores or service businesses can adjust their pricing strategy or offer sales or loyalty programs to incentivize conversions.

Whatever you do, continuously test different value propositions, pricing displays, and other variables to find the combination that maximizes the sign-up or purchase rate.

Optimize Organic Channels

Organic channels like SEO, content marketing, and word-of-mouth are some of a business’s biggest assets. They’re affordable ways to reach audiences and convert them into customers. Creating high-quality, informative content that attracts high-intent users is a great way to drive your CAC towards zero.

Likewise, incentivize your happiest customers to keep shopping with you. Referral and loyalty programs reward your best customers for referring your product to others, or give them perks (like their tenth drink free) when they continue to shop with you.

Focus on High-Quality Leads

Spending money acquiring leads that never convert is the fastest way to bloat your CAC. Implementing a strict lead scoring system that prioritizes prospects based on their likelihood to convert and retain will help you save time and money on marketing. Devote your sales and marketing resources to the ideal customer profiles and refine your advertising audiences to be as specific as possible. Better targeting means less wasted ad spend.

Increasing Automation

Manual sales and marketing processes are expensive. Automation reduces the need for constant, costly human intervention. You can use automation tools like email marketing software to set up automated email drip campaigns that nurture leads until they’re sales-ready. This frees up the sales team to focus on closing, not educating.