Cost Per Click (CPC)
Cost per click is the advertising cost associated with a click, commonly reported as average spend per recorded click.
What is Cost Per Click?
Average CPC describes what traffic acquisition cost at the click stage. It divides the advertising spend in a report by the clicks counted in the same report. The result is a currency amount rather than a percentage.
An actual click charge and an average CPC are different levels of detail. Individual auction outcomes can vary. A maximum CPC bid is a bidding input, not a promise that every click will cost that amount or that the reported average will equal it.
Average CPC = Ad spend ÷ Recorded clicks
Match spend and clicks by campaign, period and click type. A report may distinguish link clicks from all interactions. With no clicks, the average cannot be calculated by ordinary division.
The cost of bringing shoppers to a product page
A pet-supply campaign spends $720 and records 600 eligible clicks. Average CPC is $1.20. If 18 of those clicks lead to counted purchases, media cost per purchase is $40. The $1.20 figure describes the click, not the customer or completed order.
How to interpret it
CPC helps explain traffic cost, but cheap clicks are not automatically valuable clicks. A campaign can lower CPC by reaching people who are less likely to buy. Conversion quality and contribution from resulting orders determine whether that traffic is economically useful.
A rise in CPC can reflect a more competitive auction, a different audience or a change in placement mix. It can also accompany stronger purchase intent. Judge the change alongside the downstream result rather than treating the direction alone as good or bad.
Click counts need not equal website sessions. A visitor may click several times, leave before the page loads or be measured differently by the advertising platform and the store. Do not substitute session counts into a CPC report without changing its label.
For several campaigns, calculate a blended average from total spend divided by total clicks. Averaging their CPC values equally gives a tiny campaign as much influence as a large one.
Common mistakes
Confusing CPC with CAC
A click is not a newly acquired customer. CAC uses new customers and a stated acquisition-cost scope, potentially beyond media spend.
Mixing different click definitions
An all-clicks metric and an outbound-link-click metric can have different denominators. Compare the same type of click across periods.
Definition reference: Google Ads: average CPC.