Cost Per Click (CPC) is the amount an advertiser pays each time a user clicks on an ad. It is the primary pricing model for search advertising (Google Ads) and a common metric across paid social (Meta, TikTok, Pinterest). CPC is calculated as:
CPC = Total Ad Spend / Total Clicks
If a Google Search campaign spends $2,000 and generates 500 clicks, the CPC is $4.00. CPC measures how efficiently a campaign is buying traffic, but it is only one piece of the performance picture - a low CPC with poor conversion rate still produces a high cost per acquisition. CPC is best understood as an input metric: it determines traffic cost, and conversion rate determines what that traffic is worth.
On Google Search, CPC is determined by keyword auction dynamics - your bid, your Quality Score (a measure of ad relevance and landing page experience), and competitor bids. High-intent commercial keywords in competitive categories (supplements, skincare, software) command significantly higher CPCs than informational or niche terms. On Meta and TikTok, CPC is a function of CPM (cost per 1,000 impressions) divided by click-through rate - so a lower CPM or a more engaging creative that drives higher CTR both reduce effective CPC.
CPC benchmarks vary enormously by category, platform, and targeting. Google Search CPCs for competitive categories can range from $1 to $15+; Meta CPCs for e-commerce audiences typically fall between $0.50 and $3.00. These averages are directional only - your actual CPC is a product of your specific keyword or audience targeting, bid strategy, and creative quality. Tracking CPC trends within your own account over time - rather than against industry benchmarks - is more actionable for optimization decisions. CPC connects directly to PPC strategy and is one of the component metrics in the ROAS calculation.
Optimizing for CPC directly is a common mistake, since a campaign can lower its CPC by shifting budget toward broader, lower-intent keywords or audiences that convert worse — the CPC number improves while CAC gets worse. On Google Search, this usually means keeping bid strategy anchored to conversion value rather than click volume, which is core to how Paid Search & Google Ads campaigns get structured; on Meta and TikTok, where CPC is a function of CPM and CTR, the more durable lever is creative that earns a higher click-through rate at the same CPM, which is where Paid Social & Meta Ads work tends to focus first.
Lowering CPC by shifting budget toward broader keywords or audiences is the classic trap, because the ROAS number that results can look fine for weeks before the CAC damage shows up in blended numbers; this practical guide to ecommerce PPC and ad management covers the auction and bidding mechanics that make that trade-off visible before it compounds.
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