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Cost Per Acquisition: What Each Customer Costs You to Acquire

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You ran three campaigns to get new customers. Campaign A cost you five hundred dollars and got ten customers. Campaign B cost you one thousand dollars and got fifty customers. Campaign C cost you two thousand dollars and got one hundred customers. Without knowing cost per acquisition, you might think Campaign C is the best because you got the most customers. But your actual cost per customer might tell a different story.

This article explains cost per acquisition, how to calculate it correctly, what costs to include, and how to use it to decide which marketing channels are actually profitable.

What is cost per acquisition?

Cost per acquisition is the total amount of money you spend to get one customer. Add up all your marketing and sales costs during a specific period, divide by the number of new customers you got, and that's your CPA.

If you spent one thousand dollars on marketing in a month and acquired twenty new customers, your CPA is fifty dollars. That customer cost you fifty dollars to acquire.

CPA is different from cost per click or cost per conversion from ads. Those are metrics at the ad level. CPA is the true business cost to acquire a customer when you include all marketing and sales expenses.

What costs to include in your CPA calculation

Ad spend is obvious. You spent money on ads and got customers from those ads. Include the full cost.

But also include your team costs. If your marketing team costs you fifty thousand dollars per month and they acquire one thousand customers, that's fifty dollars CPA just from salary. Your true CPA includes both ad spend and team cost.

Include software and tools. Analytics tools, marketing automation, content management systems. If those tools cost you two thousand dollars per month and help you acquire one thousand customers, that's two dollars CPA per customer.

Include content creation. If you paid three thousand dollars to create content that brought in one thousand customers, include that three dollars per customer in CPA.

Include sales team costs if you have direct sales. A sales person with a one hundred thousand dollar salary who closes ten customers per month has a ten thousand dollar cost per customer acquisition.

The difference between CPA and CAC

Cost per acquisition and customer acquisition cost are often used interchangeably, but they measure slightly different things in different contexts.

In paid advertising, CPA is what you pay per specific conversion event. You run an ad, someone sees it, clicks, and completes an action (signup, download, purchase). That action costs you a certain amount. That's advertising CPA.

Customer acquisition cost is broader. It's all the costs required to acquire a customer, including marketing, sales, customer success onboarding. A customer acquired through ads might have a five dollar advertising CPA but a fifty dollar CAC when you include sales team cost.

For this article, we're talking about the broader view. All costs needed to bring one customer into your business.

CPA across different customer types and channels

Not all customers cost the same to acquire. A customer from organic search might have a five dollar CPA because they found you for free and converted immediately. A customer from cold outreach might have a five hundred dollar CPA because you paid a sales person to chase them.

B2B CPA is usually higher than B2C because the sales cycle is longer and requires more touchpoints. E-commerce CPA is usually lower because customers self-serve through the website. SaaS CPA varies wildly depending on whether you're land-and-expand (low CPA) or require years of sales cycle (high CPA).

Segment your CPA by channel, by customer type, by audience segment. Your overall CPA might be fifty dollars, but organic search customers cost ten dollars while paid ads cost one hundred dollars. Your strategy should change based on that difference.

How to calculate CPA for multi-channel marketing

If you run multiple channels simultaneously, you can't just divide total cost by total customers because you don't know which cost led to which customer.

Attribution modeling helps here. Last-click attribution assigns all credit to the last channel the customer interacted with. Linear attribution splits credit equally. Data-driven attribution uses machine learning to assign credit based on actual impact.

For simplicity, many businesses track CPA by direct channel. How much did Google Ads cost you per customer from Google Ads. How much did Facebook cost per customer from Facebook. This gives you channel-level CPA that helps you decide where to spend next.

Using CPA to decide where to invest marketing budget

Compare CPA across channels. If organic has a ten dollar CPA and paid ads have a fifty dollar CPA, but both convert to the same customer lifetime value, paid ads are three times more expensive for the same customer quality.

If paid ads cost fifty dollars per customer but those customers have an average order value of one hundred dollars on their first purchase, you're profitable on day one. If organic costs ten dollars but those customers only spend twenty dollars on first purchase, organic looks cheaper but the customer is lower-value.

The best channel is the one with the lowest CPA relative to customer value. Not lowest CPA absolute. A customer that costs one hundred dollars to acquire but generates five hundred dollars in lifetime value is better than a customer that costs ten dollars but generates fifty dollars in lifetime value.