CPC: definition, calculation and optimisation strategies
Updated on February 22, 2026
Quick definition
CPC (Cost Per Click) is the cost per click representing the average amount paid by an advertiser each time a user clicks on one of their ads. CPC is the reference metric in ad bidding systems such as Google Ads or Meta Ads for controlling click-based spending.
How it works
Formula
CPC = Total campaign cost / Total number of clicks
Example: a campaign costing €500 for 250 clicks = average CPC of €2
In bidding systems (Google Ads, Bing Ads), the actual CPC is determined by an algorithm that takes into account:
- The advertiser's maximum bid
- The Quality Score (ad relevance, historical click-through rate, landing page quality)
- Competition on the keyword
Two advertisers with the same bid can therefore obtain very different CPCs depending on the quality of their ads. CPC varies enormously by sector: below €0.50 in low-competition niches and up to €20–50 on highly contested keywords such as "car insurance" or "divorce lawyer".
The relationship between CPC and CPA is direct: CPA = CPC / CVR. Lowering CPC or raising conversion rate mechanically improves CPA.
Why it matters
CPC is the direct budget lever of any pay-per-click advertising strategy. Controlling your CPC means controlling your acquisition cost: a CPC too high without a sufficient conversion rate makes a campaign structurally unprofitable.
CPC is also useful for estimating the budget needed for a campaign before launch, by combining estimated search volumes with average sector CPCs from keyword planning tools.
How to improve or use it
- 1Improve your Quality Score by optimizing the relevance of your ads and landing page.
- 2Use long-tail keywords that are less competitive and therefore less expensive.
- 3Set time slots and geographic zones to limit spend to the times and places where your audiences convert best.
- 4Use exact match keywords to avoid paying for irrelevant clicks.
- 5Systematically add negative keywords to exclude non-relevant queries.
With Sublim
Sublim lets you precisely measure which paid traffic sources actually convert on your site, attributing conversions reliably without depending on third-party cookies. By analyzing the relationship between your CPC per source and the conversions generated, you identify which channels deserve higher bids — an analysis accessible without a dedicated data analyst.
Frequently asked questions
What is the difference between CPC and CPM?
CPC (cost per click) is a model where the advertiser only pays when a user clicks on the ad. CPM (cost per thousand impressions) is a model where the advertiser pays for every thousand impressions, regardless of clicks. CPC suits performance campaigns (driving traffic, conversions), while CPM is better suited to brand awareness campaigns.
How is CPC calculated in Google Ads?
In Google Ads, the actual CPC paid is calculated using the formula: CPC = (Ad Rank of next competitor / Your Quality Score) + €0.01. This means you typically pay less than your maximum bid. A high Quality Score (7 to 10 out of 10) lets you secure better positions for a lower CPC than your competitors.
What is the average CPC on Google Ads in France?
The average CPC on Google Ads in France ranges from €0.50 to €5 across most sectors. Highly competitive areas such as finance, insurance, legal or real estate can see CPCs above €10–30. Standard e-commerce sectors (fashion, beauty, tech) generally sit between €0.50 and €2.
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