Definition
CPC (Cost Per Click) is ad spend divided by the number of clicks. Pay €55 for 100 clicks and your CPC is €0.55.
Also called: CPC, Cost Per Click, Click priceCost per click connects budget and traffic.
Change the inputs to see how numerator and denominator affect the result.
What determines your CPC
CPC is a product of CPM and CTR: CPC = CPM / (CTR × 10). Make your creative or search ad more relevant, CTR rises and CPC falls, even at an unchanged CPM. In paid search, ad quality contributes to the auction. Quality Score helps diagnose relevance and landing-page issues; the reported score is not itself an auction input.
So CPC is as much a relevance measure as a price measure. The cheapest route to a lower CPC is rarely to bid lower, but to make the ad more relevant.
CPC isn't the finish line
A low CPC is only worth something if the clicks convert. A channel with expensive clicks that often turn into purchases can be cheaper per order than a channel with cheap clicks that rarely do. That's why we steer by CPA and POAS — not CPC alone.
CPC is useful for diagnosis: if CPA rises, you can see whether it's from more expensive clicks (CPC) or worse conversion (CVR), and fix the right thing.
Frequently asked questions
How do I lower my CPC?
Most often by raising relevance: better creative or ad copy lifts CTR, which lowers CPC at the same CPM. In Google Ads, examine search terms, ad relevance and the landing page. Evaluate qualified conversions and economics, not just click price.
Is a low CPC more important than conversion rate?
No. What counts is the total cost per order (CPA). Expensive clicks that convert well beat cheap clicks that don't. Always read CPC alongside conversion rate.
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About the author
Nicklas Segatz Mortensen
Growth hacker and fractional CMO with 10+ years' experience and hundreds of millions in managed ad spend behind him. Background from larger Danish and international scale-ups, and from the agency world.
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