Contents
- Google Ads doesn't cost a price tag but a budget you set, spent click by click through an auction.
- The cost of a click varies tenfold by industry: a few tens of cents in general, several euros in insurance or B2B software.
- The useful budget isn't chosen, it's calculated from margin per client and conversion rate.
- Below about thirty monthly conversions, automatic bidding works in the noise, whatever the stated budget.
- The daily budget is an average: Google can exceed it some days and offset it on others.
There's no price, there's an auction
Google doesn't sell placements at a listed price. At each search, an auction pits the advertisers positioned on that query against each other. You only pay if someone clicks, and you pay the amount it took to edge out the next competitor, weighted by the relative quality of your ad.
Two consequences. You can't know in advance what Google Ads will cost you: it depends on your competitors. And two advertisers on the same query don't pay the same price, because Quality Score enters the calculation.
What you control: the daily budget, the keywords, the geographic area and the quality of your ads and pages.
What a click costs
CPC depends first on the industry. On lightly contested queries, a few tens of cents are enough. In insurance, legal, education or B2B software, several euros are the norm, and clicks over ten euros exist.
- Insurance
- 5,5 € — the most contested auctions on the market
- Legal
- 4,2 €
- B2B software
- 3,1 €
- Education
- 2,4 €
- Local services
- 1,2 €
- E-commerce
- 0,6 € — outside high-demand periods
Cost then depends on intent. A broad query like "software" costs less than a specific one like "invoicing software for tradespeople", but converts ten times less. The cheapest click is rarely the least costly in the end.
Finally it depends on you. At an equal bid, an ad better aligned with the keyword and a solid landing page lower the price paid. It's the only durable lever, and it's detailed in our article on Quality Score.
The minimum budget, technical and real
Google accepts any daily budget. The technical minimum is meaningless: what matters is the data volume needed for the account to learn.
A campaign on automatic bidding needs regular conversions to optimize. Below about thirty monthly conversions, the algorithm works in the noise. If your CPA sits around 40 euros, that means a monthly budget on the order of 1,200 euros for the system to work as intended.
Calculating your budget backwards
Start from the result, not the amount available. Work out the margin a client brings, then the number of conversions needed to win that client. You get the maximum bearable cost per conversion. Multiply it by the number of clients targeted: that's your budget.
In this example, ten clients a month need 40 quotes. At the ceiling cost of 200 euros, the budget would be 8,000 euros and the operation would break even. If campaigns run at 120 euros per quote, the same goal costs 4,800 euros and yields 3,200 euros of margin.
What drives the bill up
Four causes explain most of the drift, and three of them are fixed from the account.
- Unmonitored broad queries
Without regular negatives, a broad-match campaign ends up paying for searches unrelated to the offer. It's the first thing to check on an account whose cost rises without explanation.
- An unsuitable landing page
Sending all traffic to the home page collapses the conversion rate and mechanically doubles cost per conversion. The account isn't to blame, and no bid setting will fix it.
- A low Quality Score
It raises every click without anything showing in the settings. It's the most discreet cause, and the one fixed most durably.
- Seasonality
In many industries, competition rises at year-end and costs with it, without any setting having changed. It's anticipated in the budget, it isn't fixed.
What Google bills, and when
| Point | What you need to know |
|---|---|
| Unit billed | The click on the Search Network, never the impression |
| Daily budget | An average: overshoot possible some days, offset afterwards |
| Real ceiling | The daily budget times the average number of days in the month |
| Charge timing | At a spend threshold or on a fixed date, depending on account setup |
| Taxes | The amounts shown in the interface are before tax |
Tracking what the budget actually produces, week after week, is more useful than watching the spend itself. That's what Adwise does once the account is connected to the Workspace: what was spent, what it returned, and since when the trend has shifted. The Google Ads integration is detailed on the site.
Frequently asked questions
The Adwise team connects Google Ads, Meta Ads, LinkedIn Ads, GA4 and Search Console so agencies and freelancers can run their campaigns from a single place.