Customer Acquisition Cost
The total amount a business spends on sales and marketing to win one new customer, calculated by dividing total acquisition spend by the number of new customers gained in the same period.
Customer acquisition cost (CAC) is the total amount a business spends on sales and marketing activity to bring in one new customer. It is one of the most direct measures of how efficiently a business grows: too high, and you are spending more to win customers than those customers generate in return; too low, and you may be under-investing in growth.
For small to medium-sized businesses (SMBs), CAC rarely gets tracked with the same rigour as revenue or margin - but it should. Knowing what each new customer costs helps you make better decisions about which channels to invest in, how long a sales cycle is sustainable, and whether your pricing covers your growth spend.
How to Calculate Customer Acquisition Cost
The formula is straightforward: divide your total sales and marketing spend in a given period by the number of new customers acquired in the same period.
CAC = Total Sales and Marketing Spend / New Customers Acquired
For example, if you spend $15,000 on sales and marketing in a quarter and win 30 new customers, your CAC is $500.
The common mistake is understating the spend figure. A fully loaded CAC calculation includes staff salaries, software tools, advertising spend, content production costs, and any overhead directly tied to winning new business. A CAC based only on ad spend will look artificially low and lead to poor investment decisions.
Organic vs. paid CAC
Tracking organic and paid acquisition costs separately gives a clearer picture. Referral and content-driven customers typically carry a much lower CAC than those won through paid advertising, and they often show higher retention rates over time.
What Is a Healthy Customer Acquisition Cost?
CAC on its own is not a useful number - it becomes meaningful only when compared to customer lifetime value (CLV). The LTV:CAC ratio measures how much revenue a customer generates over their lifetime against what it cost to acquire them.
A 3:1 LTV:CAC ratio is the widely cited minimum for a sustainable business: the customer generates three times more revenue than it cost to win them. Below 3:1, margins get squeezed. Above 6:1, the business may be under-investing in growth.
For SMBs in service-based verticals - construction, promotional merchandise, AV, or office furniture - the benchmark will differ from SaaS or ecommerce norms. What matters most is tracking the ratio consistently within your own business and measuring how it changes over time.
Another useful measure is the CAC payback period: how many months of gross margin does it take to recover the acquisition cost? For SMB-focused businesses, a payback period under 12 months is a reasonable target.
Tracking leads through to conversion gives businesses a clearer view of which sales activities are genuinely converting and at what cost. Zigaflow captures enquiries through to accepted quotes, providing the visibility needed to connect acquisition activity to actual customers won.
Common in
Frequently asked questions
Ready to put this into
practice?
Book a free demo and see how Zigaflow fits your team.