Cost Per Acquisition

How much does it cost you to land one new client? If you don't know, you can't tell if your marketing and sales effort is paying off. Cost per acquisition (CPA) is another name for CAC—the total cost to acquire one new client, including marketing spend, tools, and the value of your and your team's time on sales and marketing. Knowing it tells you whether you can afford to grow and at what price.

Same number, different labels. CAC and cost per acquisition are the same metric. Some teams use "CAC" for paid channels and "CPA" for all channels; in practice, use one number: total acquisition cost ÷ new clients. That's your cost per acquisition. Track it over time and by channel when you can (e.g. referral vs paid vs content).

Why it matters

Pricing. If your cost per acquisition is $2k and your average engagement is $5k with 40% margin, you're spending $2k to make $2k profit on the first deal—break-even on acquisition. To improve, you either lower acquisition cost (e.g. more referrals, better conversion) or increase margin and lifetime value.

Scaling. Doubling clients means doubling acquisition spend unless you improve efficiency. If CPA is $3k and you want 10 new clients this quarter, plan for ~$30k in acquisition cost—or work on conversion rate, lead qualification, and referral marketing to bring CPA down.

Channel mix. When you know CPA by source (e.g. referrals $500, paid ads $4k), you can invest in what works and cut what doesn't. Often referral marketing has the lowest cost per acquisition for domain experts.

How to calculate it

1. Define the period. e.g. Last quarter or last 6 months.

2. Sum acquisition cost. Include: ad spend, marketing tools, content production, your time and team time on sales and marketing (hours × effective rate). Everything that goes into generating and closing new clients.

3. Divide by new clients. Total cost ÷ number of new clients in that period = cost per acquisition. Compare to lifetime value and LTV:CAC ratio to judge health.

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