Google AdWords pay per click: what you actually pay and how the auction decides it

Google AdWords is now called Google Ads: the name changed in 2018 and the product is the same auction. Pay per click means you are charged when someone clicks your ad, not when it is shown. What you pay per click is not your bid. Google runs an auction every time somebody searches, and your position and your price come out of Ad Rank, which combines your bid with the quality of your ad and landing page and the context of the search. A better ad and a better landing page lower your cost per click at the same bid, which is why the quality work pays for itself.

Everything useful in this channel follows from that one sentence. You are not buying clicks at a fixed rate. You are competing for them, and the competition is scored on relevance as well as money.

The auction, in the order it happens

1. Somebody searches. Google assembles the eligible ads: keywords that match the query, in campaigns targeting that location and device, with budget left.
2. Each ad gets an Ad Rank. Google describes this as being calculated from your bid, your ad and landing page quality, the Ad Rank thresholds, the context of the search, and the expected impact of your assets and ad formats.
3. Position is assigned from the highest Ad Rank down, and ads below the thresholds do not show at all.
4. You are charged only on a click, and the amount is the minimum needed to hold your position against the ad beneath you. That is why your average cost per click is usually below your maximum bid.

Quality Score: what it is for

Quality Score is the 1 to 10 diagnostic Google reports at keyword level, built from three parts, each graded as above average, average or below average:

• Expected click through rate. How likely your ad is to be clicked when it shows for this keyword.
• Ad relevance. How closely the ad text matches the intent behind the keyword.
• Landing page experience. How relevant and usable the page is for somebody who clicked that ad.

Google is explicit that the reported number is a diagnostic rather than the figure used in the live auction, and that improving the three components is what matters. Read the Quality Score definition and the fuller guidance for search campaigns before you act on it. The practical rule is that each below average component is a named piece of work: rewrite the ad, tighten the ad group, or fix the page the click lands on.

What you control and what you do not

Yours to set	Set by the auction
Maximum bid or bid strategy target	The actual cost of each click
Keywords, match types and negatives	Which queries your match types catch today
Ad copy, assets and extensions	Which combination is shown
The landing page	Competitor behaviour and their bids
Locations, devices, schedules, audiences	Seasonal demand and query volume
Daily budget	How much of the available traffic that budget reaches

Match types and negatives, which decide what you pay for

Three match types are live in Google Ads today, and the keyword you type is not the query you buy.

• Broad match reaches the widest set of related searches. It is useful for discovery with a tight budget cap and a watchful eye on the search terms report.
• Phrase match reaches searches that include the meaning of your keyword. It is the sensible default for most accounts.
• Exact match reaches searches with the same meaning as your keyword, which is close control without being literal.
• Negative keywords are the other half of the job. Read the search terms report weekly and add negatives for free, cheap, jobs, salary, DIY, the competitor names you do not want, and anything describing a buyer you cannot serve. This single habit cuts waste in nearly every account.

For account structure, bidding and how to judge an agency running it, see PPC management done properly.

Working out what you can afford

Do this arithmetic before you set a budget, using your own numbers rather than anybody's benchmark. Keyword Planner gives you a current cost per click range for your keywords and locations, and your own sales records give you the rest.

Step	The sum	Where the number comes from
Clicks you can buy	Monthly budget divided by average cost per click	Budget is yours, cost per click from Keyword Planner
Enquiries from those clicks	Clicks multiplied by landing page conversion rate	Your analytics, or a conservative figure for a new page
Cost per enquiry	Budget divided by enquiries	Falls out of the two rows above
Cost per sale	Cost per enquiry divided by your close rate	Your sales records
Verdict	Compare cost per sale against gross margin per sale	Your accounts

If cost per sale comes out above margin, the fix is rarely a bigger budget. It is a narrower keyword set, a better landing page, or a different offer. For what sets the price in the first place, see Google Ads PPC cost.

Bid strategies in plain terms

• Manual CPC gives you the bid at keyword level. Good for small accounts and for learning what things cost.
• Maximise clicks spends the budget on volume. Useful for a short discovery phase.
• Maximise conversions, with or without a target cost per action, needs conversion tracking that works and enough conversion data to learn from.
• Target return on ad spend suits ecommerce with reliable revenue values passed back to Google.

Automated bidding is only as good as the conversion data you feed it. Get conversion tracking right first, including offline conversions if your sales close by phone, and then let a strategy optimise against something real.

This page covers how the pay per click auction works in Google Ads and what decides your price. For account management in depth, see the PPC management guide above. For organic search, which is a different budget and a different timescale, see SEO KPIs.

Google AdWords pay per click: what is still unclear

Is AdWords still called AdWords?

No. Google renamed it Google Ads in 2018. The sign in is at ads.google.com, and anything written about AdWords mechanics still applies to the same auction.

Do I pay when my ad is shown but not clicked?

Not in a pay per click search campaign. Impressions are free and clicks are charged. Some other Google campaign types can be bought on a per impression or per view basis, which is worth checking when you set a campaign up.

What is a good Quality Score?

Seven and above is comfortable, and the number itself is less useful than the three components. Work on whichever component reads below average, because that is the one costing you money.

What is the minimum budget worth starting with?

Enough to buy a meaningful number of clicks per week on your tightest keyword set, which you can calculate from the table above. Starting narrow on a small budget works. Starting broad on a small budget spends everything on discovery.

Does a competitor clicking my ads cost me money?

Google filters invalid clicks it detects and credits them back, which covers most of this. Keep an eye on the invalid clicks column, and spend your attention on the search terms report instead, where the real waste shows up.

Should I bid on my own brand name?

Usually yes, because the clicks are cheap, the conversion rate is high, and it keeps the top of the page when competitors bid on your name. Measure it separately from everything else so it does not flatter your overall numbers.

The free listing above the ads

You pay per click on the ads. Above or beside them, an assistant or AI Overview may now answer the same query in a paragraph, with no click to buy.

For some searches the answer settles the question; for others it sends people on. Test your five most expensive keywords: type each into an assistant and see whether your company is named. If your competitor is named for a term you pay heavily for, the cost per click understates the cost of being missing. AI Knows Us keeps a record of those answers across the assistants.