Paid Advertising
Cost Per Acquisition (CPA)
Cost per acquisition (CPA) is the average amount an advertiser spends to win one conversion, such as a sale, signup, or lead. It ties ad spend to actual results, making it a key profitability metric for performance campaigns rather than just traffic or reach.
Why it matters
CPA shows what each customer or conversion truly costs, so it directly informs whether a campaign is profitable. Comparing CPA to customer value or order value tells you if you can scale spend or need to cut it.
How it is measured
CPA = total ad spend / total conversions. Example: $1,000 spend producing 40 conversions = $1,000 / 40 = $25 CPA.
Typical benchmarks
Target CPA depends entirely on what a conversion is worth; a sustainable CPA sits comfortably below your average order value or customer lifetime value.
Frequently asked questions
What is a good CPA?
A good CPA is one that leaves room for profit, meaning it is lower than the revenue or lifetime value each acquisition generates. There is no universal figure; it is defined entirely by your margins and customer economics.
How is CPA different from CPL?
CPL (cost per lead) measures the cost of capturing a lead such as a form fill. CPA is broader and usually refers to a more committed action like a purchase. A lead is one step earlier in the funnel than an acquisition.
How can I reduce CPA?
Improve conversion rate on the landing page, tighten targeting, lower upstream costs like CPC and CPM, test creative, and pause underperforming segments. Because CPA combines traffic cost and conversion efficiency, gains in either lower it.