Customer Acquisition Cost (CAC) is arguably the single most important metric for any growing business. Simply put, CAC measures how much money you spend to acquire a single new paying customer.
If your CAC is significantly lower than the lifetime value (LTV) of your customers, your business is a money-making engine. If your CAC is higher than your LTV, you are losing money on every sale, and your growth is unsustainable.
In this guide, we'll explain how to automatically calculate CAC, what to include in your costs, and strategies to improve your acquisition efficiency.
How to Calculate Customer Acquisition Cost
The basic formula for Customer Acquisition Cost is straightforward:
CAC = Total Sales and Marketing Expenses / Number of New Customers Acquired
While the formula is simple, the trick is knowing exactly what to include in that "Total Sales and Marketing Expenses" bucket. To get an accurate number, you must calculate fully loaded CAC.
What to Include in Fully Loaded CAC
- Ad Spend: Google Ads, Facebook Ads, LinkedIn Ads, sponsorships, etc.
- Software & Tools: CRM (HubSpot, Salesforce), email marketing (Mailchimp), analytics tools, and SEO software.
- Salaries: The full salaries (including benefits) of your marketing team, sales reps, and customer success teams working on onboarding.
- Agency Fees & Freelancers: Costs for outsourced SEO, content creation, design, or PR.
- Overhead: A proportional amount of office space and equipment used by the sales and marketing teams.
The Magic Ratio: LTV:CAC
Knowing your CAC alone isn’t enough. You need context.
Is a $500 CAC good or bad? If you sell a $50 pair of shoes with no repeat purchases, $500 is a disaster. If you sell enterprise software with a $50,000 annual contract, $500 is incredible.
That's where Customer Lifetime Value (LTV) comes in. LTV measures the total gross profit you expect to earn from a customer over the entire time they do business with you.
The consensus benchmark for a healthy SaaS or subscription health business is an LTV:CAC ratio of 3:1.
- 1:1 or lower: You're losing money.
- 3:1: The sweet spot. You have a solid business model with good margins.
- 5:1 or higher: You're potentially under-investing in marketing. You could be growing much faster if you spent more to acquire customers.
4 Strategies to Lower Your CAC
If your customer acquisition costs are creeping up, here are four actionable ways to bring them back down.
1. Optimize Your Funnel Conversion Rates
The fastest way to lower CAC is to convert more of the traffic you're already paying for. Use our Conversion Rate Calculator to track improvements. Simple A/B tests on your landing pages, better call-to-action (CTA) buttons, and frictionless checkout processes can drastically improve conversion rates without spending an extra dollar on ads.
2. Invest in Inbound Marketing and SEO
Paid ads deliver immediate results but require constant spending. Content marketing, SEO, and organic social media take time to build, but once established, they bring in leads at a near-zero marginal cost, drastically lowering your blended CAC over time.
3. Implement a Referral Program
Your best salespeople are your existing happy customers. Dropbox famously lowered its CAC by offering free storage to users who referred friends. By incentivizing word-of-mouth marketing, you bypass expensive ad networks.
4. Improve Sales Efficiency
For B2B companies, a high CAC is often driven by sales salaries and long sales cycles. Improve efficiency by adopting better CRM automation, pre-qualifying leads with chatbots, or shortening the time-to-close with better sales enablement materials.
The Bottom Line
You can't optimize what you don't measure. Make a habit of tracking your CAC monthly or quarterly. Use the Bizcalc Customer Acquisition Cost Calculator to crunch the numbers quickly and ensure your growth engine is running efficiently.
