Paid Advertising
Cost Per Acquisition (CPA)
The average cost to win one paying customer or completed conversion from a campaign, calculated by dividing ad spend by the number of acquisitions.
Definition
Cost Per Acquisition is what you pay, on average, to turn ad spend into one actual customer or completed conversion, not just a lead. It's the truest cost-efficiency metric because it counts the end goal, whether that's a sale, a booked job, or a signed contract.
In depth
CPA goes one step past cost per lead. A lead is an inquiry; an acquisition is the outcome you actually wanted — a signed job, not just a request for an estimate. Because not every lead converts, CPA is almost always higher than CPL, and the gap between the two reveals how well you and your estimator turn interest into booked work.
For budgeting, CPA is the number you compare against the profit on a job. If a booked job nets you $600 in profit and your CPA is $150, the math works and you should spend more. If your CPA creeps above what a job is worth, you're buying revenue at a loss, no matter how good the other metrics look.
Most accounts can lower CPA without touching their bids at all, just by fixing the leaks between click and signed job: a faster landing page, better lead routing, quicker follow-up. We look at the whole path, because the cheapest acquisition is often the one you improve after the click, not before it.
The formula
CPA = Total Ad Spend ÷ Number of Acquisitions Worked example
Spend $3,000 and book 20 jobs and your CPA is $150. If each job nets $600 in profit, you're paying $150 to earn $600, a 4:1 return.
Paid Advertising
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