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Cost per acquisitionThe average cost to win one order or conversion from advertising.
CPA (cost per acquisition) is ad spend divided by the number of orders (or conversions) it produced. It tells you what each new order costs to acquire. On its own it's just a cost — it only means something next to your break-even CPA.
In practice
CPA is the cost side of advertising with none of the context, which makes it easy to misread in both directions. A rising CPA isn't automatically bad — if it's buying higher-value orders, revenue per order may be rising faster. A falling CPA isn't automatically good either, since the cheapest orders often come from audiences that would have bought anyway.
Where it's genuinely sharp is comparison. Held side by side across channels, over the same window and against the same break-even, CPA shows you which sources are buying orders economically and which are quietly expensive. That's a budget conversation you can have without resolving a single attribution argument.
Formula
CPA = Ad spend ÷ Conversions
Example: $2,000 spend for 100 orders = $20 CPA.
What a good result depends on
A ‘good’ CPA is comfortably below your break-even CPA.
Common mistakes
- Judging CPA without knowing your break-even.
- Confusing CPA (per order) with CAC (per customer, who may repeat).
Questions people ask
- What's the difference between CPA and CAC?
- CPA is cost per order or conversion; CAC is cost per newly acquired customer. If customers buy more than once, CAC is the higher and more meaningful number for growth decisions.
- Is a lower CPA always better?
- No. A low CPA on orders that would have happened anyway — branded search, retargeting your own email list — buys very little. Judge it against break-even and against incremental sales, not in isolation.
- How do I know if my CPA is sustainable?
- Compare it to your break-even CPA, which is the contribution left in an order after all variable costs. Comfortably below is sustainable; consistently above needs either better margins or a better offer.