Why cost per click (CPC) matters to a first-time founder
Cost per click (CPC) shows how efficiently paid media produces visits, but not whether those visits become customers. A low CPC can still waste money on irrelevant clicks. Founders should read it with conversion rate and customer acquisition cost, then separate campaigns, audiences, and devices that behave differently.
Examples of cost per click (CPC)
A campaign spends €600 and records 1,500 clicks. Average CPC is €600 divided by 1,500, or €0.40. If 15 clicks become customers, advertising cost per acquired customer is €40. Another campaign at €0.70 CPC may be better if its visitors convert often enough to produce customers below €40.
Common misunderstanding
CPC is a metric, while pay-per-click describes a common buying model. Platforms may charge a different amount for each auction, so average CPC is not necessarily the bid or maximum price. Click definitions, invalid-traffic adjustments, attribution, fees, and taxes can also differ between platforms and reports.
When to use it
Use CPC to monitor click-based campaigns and diagnose changes in traffic cost. Compare like-for-like dates, audiences, placements, and currencies. Do not optimise it alone: connect clicks to useful actions and contribution margin. For campaigns priced by impressions or outcomes, CPC may remain informative but is not the contracted charge.