Cost per click (CPC)

Cost per click (CPC) is exactly what it sounds like: how much you pay each time someone clicks your ad. Not per view, not per sale, per click. It's the basic unit of cost in paid search, and it's spread into most other ad channels too.

The maths is simple. Take your total spend and divide by clicks. Spend 1,000 GBP on Google Ads, get 500 clicks, your CPC is 2 GBP. That's the average price of getting one person onto your site.

Here's the thing people get wrong: CPC is a starting point, not the score. A cheap click that never converts is worse than an expensive one that does. The number that actually matters is cost per conversion, which is CPC and conversion rate working together. So don't chase a low CPC for its own sake. Chase the clicks that turn into customers, even when they cost more.

What you can actually do about it: improve your Quality Score by matching ad copy to search intent and pointing clicks at a tight, relevant landing page, because a better Quality Score lowers your CPC directly. Use negative keywords (add 'free' and 'open source' if you sell enterprise) to stop paying for clicks that will never buy. And bid by value, more for keywords you know convert, less for unproven ones.

Say you're running B2B search ads and your CPC jumped from 1.50 to 3.00 GBP overnight. You want to see that the moment it happens, not at month-end. Pipe your Google Ads spend and clicks into a live dashboard with Databox so a CPC spike on a key campaign is a number on a screen, not a nasty surprise in the invoice.

Say you've got a high-CPC keyword you genuinely want to win, like 'agile project management software for enterprise' at 5 GBP a click. The way to make that click pay is the page it lands on. Build a dedicated, intent-matched landing page in Unbounce and run an A/B test, lifting conversion rate from 3% to 5% halves your real cost per lead without touching the bid.

And say you can't trust your CPC numbers because click and conversion tracking is wired up by hand and half-broken. Manage your tags in one place with Google Tag Manager so every click and conversion fires consistently, because a CPC built on dodgy tracking is a number you can't act on.

An HR software company noticed their competitor changed their website messaging. They started bidding on competitor brand keywords, achieving £6.80 CPC because competitors were bidding aggressively to defend their brand. Despite the high CPC, the conversion rate from competitor brand searchers was 12%, resulting in a cost per lead of £57. The high CPC was justified by the conversion rate.

To optimise your CPC, start by improving your Quality Score (on Google) or Relevance Score (on other platforms). These scores depend on your ad copy relevance, landing page quality, and click-through rate. Improving these scores lowers your CPC directly. Write ad copy that matches search intent, and ensure your landing pages are relevant to your ads.

Refine your keyword targeting. Broad keywords typically have lower CPC but attract less qualified clicks. Specific, long-tail keywords usually have higher CPC but attract more qualified prospects. Test to find the right balance for your business. Negative keywords reduce wasted clicks: if you sell enterprise software, add 'free' and 'open source' as negative keywords to avoid clicks from those searching for low-cost options.

Bid strategically based on expected conversion value. You don't need to minimise CPC uniformly; instead, bid higher for keywords and audiences you know convert well, and bid lower for unproven keyword clusters. Use conversion tracking to feed back which clicks led to conversions, then adjust bids accordingly.

A project management software company started bidding on broad keywords like 'project management software', paying £3.50 CPC. After analysis, they realised their highest-converting traffic came from specific keywords like 'agile project management software for enterprise' (£5.20 CPC) and 'project management software for technical teams' (£4.80 CPC). They shifted budget toward these specific keywords, accepting slightly higher CPC to get higher-conversion traffic, and reduced cost per customer by 35%.

For B2B growth teams using paid advertising, CPC is the lever you pull to manage campaign profitability. If your CPC is too high, your cost per acquisition becomes prohibitive. If your CPC is too low, you might be bidding too conservatively and missing valuable traffic.

Understanding CPC across channels helps you allocate budget effectively. If LinkedIn delivers leads at a lower cost per acquisition despite higher CPC, it's because the quality of LinkedIn clicks is higher. You might increase LinkedIn budget and decrease display budget, even though display has lower CPC.

CPC also reveals competitive intensity. If a keyword's CPC spiked from £1.50 to £3.00, that often means more competitors entered the market or seasonal demand increased. Monitoring CPC trends helps you stay aware of competitive dynamics and adjust strategy accordingly.

A B2B consultancy ran LinkedIn ads targeting Chief Financial Officers at companies with £100M+ revenue. Initial CPC was £4.50 and lead cost was £180. They refined targeting to only companies in financial services (their best-converting vertical), which increased CPC to £5.20 but reduced lead cost to £110 due to much higher conversion rates. The higher CPC was more than offset by better-qualified clicks.