Knowing what it costs to get a customer is one of the most important things you can know about your business. If you do not know your CAC, you do not know if your marketing is working or if you are just buying customers you cannot afford.
What Is Customer Acquisition Cost (CAC)?
Customer Acquisition Cost (CAC) is the total cost of acquiring a new paying customer. It includes everything you spend on sales and marketing: ad spend, salaries, software, agency fees, events, and any other cost tied to bringing in new customers, divided by the number of new customers acquired in that period.
CAC is one half of the most important ratio in business: the LTV:CAC ratio. The other half is Customer Lifetime Value (LTV).
How to Calculate CAC
Formula: Total Sales and Marketing Spend / Number of New Customers Acquired
Example: You spend $50,000 on sales and marketing in Q1 and acquire 200 new customers. Your CAC is $50,000 / 200 = $250 per customer.
What to Include in “Sales and Marketing Spend”
- Paid advertising (Google, Meta, LinkedIn, etc.)
- Content production and SEO investment
- Sales team salaries and commissions
- Marketing team salaries
- CRM, marketing automation, and sales tools
- Agency and freelancer fees
- Events and sponsorships
Many founders undercount CAC by only including ad spend and forgetting salaries. Full-loaded CAC includes all costs to run your sales and marketing engine.
What Is a Good CAC?
There is no universal good CAC. It only matters relative to the revenue that customer generates over their lifetime (LTV). The ratio is what matters:
- LTV:CAC of 3:1 or higher is typically the minimum target for a healthy business
- LTV:CAC of 5:1 or higher suggests you might be underinvesting in growth
- LTV:CAC below 1:1 means you are paying more to acquire customers than you will ever earn from them
Industry benchmarks vary widely:
- SaaS companies typically target a CAC payback period under 12 months
- E-commerce businesses often work with CAC of $15 to $150 depending on category and AOV
- Financial services and enterprise SaaS can have CAC in the thousands of dollars and still be profitable given high LTV
CAC vs. LTV
CAC tells you what a customer costs. LTV tells you what a customer is worth. Together, they tell you whether your business model is sustainable.
A business with $100 CAC and $50 LTV is losing money on every customer. A business with $100 CAC and $1,000 LTV has a strong model with room to invest in growth. The goal is always to increase LTV and decrease CAC simultaneously.
How to Lower CAC
- Improve conversion rates: Better landing pages, sales processes, and messaging mean more customers from the same ad spend
- Invest in organic channels: SEO, content marketing, and referrals have high upfront cost but lower marginal CAC at scale
- Build a referral program: Referred customers have the lowest CAC and often the highest retention
- Narrow your targeting: Reaching the right people is cheaper than reaching everyone and filtering out noise
- Improve product-market fit: When your product genuinely solves a real problem, word of mouth does some of the acquisition work for free
Why It Matters for Your Business
Tracking CAC forces discipline in marketing spend. Without it, you cannot know which channels are working, how fast you will run out of money, or whether growth is profitable. CAC is especially critical for investor conversations: investors want to see a business where the unit economics work, not just top-line growth.
Quick Takeaway
- CAC is the total cost to acquire one new paying customer, including all sales and marketing expenses
- Formula: Total Sales and Marketing Spend / New Customers Acquired
- CAC only matters in relation to LTV; target an LTV:CAC ratio of at least 3:1
- Common CAC reduction levers: better conversion rates, organic channels, referrals, and tighter targeting
- Not tracking full-loaded CAC (including salaries) is one of the most common mistakes founders make
