Paid Advertising
Cost Per Click (CPC)
The amount you pay each time someone clicks your ad, calculated by dividing total ad spend by the number of clicks.
Definition
Cost Per Click is the price you pay for a single click on a paid ad. In auction-based platforms like Google Ads, your actual CPC is set by the competition for a keyword, your bid, and your Quality Score rather than a fixed rate.
In depth
CPC is the most basic unit of cost in paid search and most paid social. You set a max bid (or let the platform bid for you), and you're charged when someone clicks, not when your ad simply shows. The real CPC you pay is almost always lower than your max bid, because Google charges just enough to beat the next advertiser in the auction.
For a marketing budget, CPC is the lever that connects spend to traffic. A high CPC in a competitive market like legal or home services means each visitor is expensive, so the quality of your landing page and the precision of your targeting matter even more. Watching CPC over time tells you whether competition is heating up or whether your account changes are making clicks cheaper.
The mistake we see most often is treating CPC as the goal. A cheap click that never converts is more expensive than a pricier click that books a job. At WellBuilt we use CPC as a diagnostic, not a target, and judge campaigns on cost per lead and cost per acquisition instead.
The formula
CPC = Total Ad Spend ÷ Total Clicks Worked example
A remodeler spends $1,000 and gets 500 clicks for an average CPC of $2. Improve ad relevance and Quality Score so the same spend buys 625 clicks, and CPC drops to $1.60.
Paid Advertising
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