Is $20 a day enough for Google Ads? Do the maths first

Twenty dollars a day sounds sensible. Cautious, even. It’s a coffee-and-a-sandwich budget. It’s also up to $608 a month per campaign under Google’s usual monthly limit, and for 11 of the 21 Melbourne service searches in my table it buys less than one click a day.

I often get asked some version of “is $20 a day enough?”. Usually it’s an owner who’s about to switch Google Ads on for the first time, or one who’s been running it for a month and can’t tell whether anything’s happening. The usual answer is “it depends”, which is useless on its own.

Is $20 a day enough for Google Ads?

Only if clicks in your industry are cheap. To get ten clicks a day out of $20, each click has to cost about $2 or less, and none of the 21 searches in my table came close. For ordinary Search ads you pay when someone clicks, and the cost per click (CPC - what each of those clicks costs you) decides how many clicks you get. The whole question comes down to one division:

Daily budget ÷ your cost per click = clicks per day.

At $20 a day and a $5 click, that’s four clicks a day, or roughly 120 a month. Small, but it’s a real test. At a $40 click it’s half a click a day, about 15 a month, which is closer to a coin toss than a campaign.

The step most owners I talk to skip is finding their own cost per click before they set the budget. They pick the number they’re comfortable losing, then find out what it buys. It should be the other way around: find out what a click costs, work out how many clicks you need to learn something, and let that set the budget.

How does Google decide what you pay per click?

Through an auction that runs every time someone searches, so there’s no set price per click. Google’s page on Ad Rank (Ad Rank is Google’s score for where your ad shows, if at all) lists six things that feed it:

• your bid
• the quality of your ad and landing page
• the minimum bar an ad has to clear before it can show at all
• how competitive that particular auction is
• the context of the search (the person’s location, device, the time and so on)
• the expected effect of extras like a phone number or extra links in your ad

Your bid is the most you’re willing to pay for a click. Google says “How much you actually end up paying is often less”. That’s the auction at work: what you pay depends on whoever else happens to be in it.

You’ll see a Quality Score in your account, a 1 to 10 rating for each keyword. Google calls it “a diagnostic tool” and says “Quality Score is not an input in the ad auction.” The real quality of your ad and landing page does count in the auction; the score is Google’s summary of how you compare with other advertisers.

In a crowded auction (plumbers, locksmiths, lawyers) you’re up against businesses that may be spending many times more than you. Your $20 buys the same expensive clicks, just fewer of them.

What does $20 a day buy in your industry?

The table below does the division for 21 common Melbourne service searches. The cost-per-click figures are Google Ads keyword data, which I pulled on 22 September 2026 through DataForSEO (a keyword-data service built on Google’s own Ads API), with the location set to Australia. DataForSEO reports them in US dollars, so I’ve converted them to Australian dollars. They’re estimates, not quotes: your actual price depends on everything in the auction above, “near me” or suburb-level searches can price differently, and a campaign targeted only at Melbourne may too.

Source: Google Ads keyword data retrieved via DataForSEO (Australia, 22 September 2026), which reports cost per click in US dollars; converted to Australian dollars at the Reserve Bank’s 21 September 2026 rate of A$1 = US$0.7124 (RBA exchange rates). Estimates from past data, not predictions.

At A$20 a day, none of the 21 gets to ten clicks. The cheapest search in the set, “vet melbourne”, buys about four. Eleven of the 21 buy less than one click a day.

My read is that urgency and job value set the price. Locksmiths and emergency plumbers sit around A$56 a click on these estimates, and the dearest search in the whole set is my own trade: “seo melbourne”, at about A$73. Search volume isn’t what sets it, going by these figures: “house cleaning melbourne”, “pest control melbourne” and “plumber melbourne” each show about 4,400 searches a month, yet their estimated click costs are roughly A$13, A$25 and A$40. I suspect what a job is worth, and how many businesses are chasing it, matters far more than how many people search.

How much the estimates moved in two months

I pulled the same 21 searches in July. Two months later the typical estimate had moved about 12%, up or down, with eight of the 21 moving 20% or more: air conditioning installation up 47%, bookkeeper down 44%. (Both pulls came back in US dollars, so part of any change could just be the exchange rate moving.) Treat any single cost-per-click figure, mine included, as a snapshot, and check your own before you commit to a budget.

Google’s Keyword Planner won’t give you one neat price per click. For each search it shows a top of page bid range, which Google describes as roughly the 20th to 80th percentile of what advertisers have historically paid for a top-of-page bid (the middle of past bids, leaving out the cheapest and dearest fifth). That’s a bid range rather than the average price of a click, so it won’t match my table exactly. Use the high end, and if it’s well below my figure for a similar search, work from my figure instead.

Try this: open Google Keyword Planner (it’s in the Tools menu of a Google Ads account, and Google’s guide says you need billing details entered in your account before you can use its keyword ideas), choose Discover new keywords, and enter the two or three searches you’d actually bid on: your service plus your suburb or city. Take the high end of each top of page bid range and divide your daily budget by that number.

One gap in the table: health searches. When I pulled physio, psychologist and dentist searches in July, Google’s keyword data came back empty. The same Keyword Planner guide says keywords “considered sensitive are not discoverable or forecastable”, which may be why, so don’t count on the planner to size health searches like these for you.

Why is ten clicks a day my floor?

Ten clicks a day is my working rule of thumb. Google doesn’t set it, and I didn’t invent it either.

Ten a day is about 300 clicks a month. At that volume, patterns start to show up: which searches bring real enquiries and which bring tyre-kickers, which ads people click and which they scroll past. At two clicks a day (about 60 a month), one good week or one bad week can swing the whole picture, and a weak ad looks exactly like bad luck. In my experience the first month of a new campaign is often a learning month even with a healthy budget, and a thin budget stretches that learning out.

Separately, I ask for at least $1,000 a month in ad spend before I’ll manage a Google Ads account. That’s on my paid search page. Below that, there’s too little data to tell what’s working, and my management fee swallows too much of the value. At up to $608 a month, $20 a day is under that minimum. Even the minimum doesn’t reach ten clicks a day on any search in the table: $1,000 a month is about $33 a day, which buys about seven clicks on the cheapest search and less than one on a plumber search.

You can still run ads below ten clicks a day. Just expect to learn slowly, and give the channel longer than a month before you judge it.

Why did Google Ads charge me $500?

Often it’s just how Google bills. Two things catch people out.

First, your daily budget is an average, not a cap. Google’s spending limits page says a campaign “might spend up to twice your average daily budget” on a given day, and that the monthly limit is “30.4 times your average daily budget for most campaigns”. On a $20 daily budget, that’s up to $40 on a busy day and up to $608 over a month. If the clicks run past those limits, Google says you’ll “never actually pay more than your spending limits”, but a $40 day on a $20 budget still looks alarming if nobody warned you.

Second, the payment threshold. On postpay (the setting Google used to call automatic payments, where you pay after the clicks), Google charges your card when your costs reach a set amount (your payment threshold) and on the first day of each month. That threshold rises each time you hit it before the month ends, up to a limit. Google’s own worked example has an advertiser starting at a $50 threshold, then moving to $200, $350 and finally $500. In Google’s words: “You won’t be emailed or notified when your payment threshold increases.”

A $500 charge is often a stretch of clicks billed in one go, because your threshold quietly climbed. Google notes that thresholds vary by account, country and currency, so check yours rather than assuming the example numbers.

Try this: in your Google Ads account, select the Billing icon, then Summary. The “Next automatic payment” card shows your current payment threshold and the likely date of your next automatic payment. Check it now, while nothing’s wrong.

If a charge still doesn’t add up after that, Google keeps a page of common questions about charges that’s worth reading before you ring anyone.

Did Google switch your campaign to AI Max in September 2026?

Possibly, and if you run your own account it’s worth a two-minute look.

On 12 August 2026 Google announced on its Ads Developer Blog that from 1 September it would start automatically upgrading some Search campaigns to AI Max, its newer bundle of automated features. The upgrade covers campaigns using either of two older settings: campaign-level broad match (which lets Google match your ads to looser variations of your keywords) or standalone “automatically created assets” (extra ad text Google writes for you). The post said the migration would “roll out progressively throughout the month”, with campaigns “migrated in-place”: same campaigns, new settings.

From 3 August 2026, Google had already blocked anyone from creating those older settings, in the Google Ads interface, Google Ads Editor and its developer tools.

On a small budget this matters, because AI Max’s search term matching lets your ads show for searches beyond your existing keywords. Google’s AI Max guide says it uses “broad match, asset-based and landing page-based technology to optimise campaign reach”. Extra reach can help. On $20 a day, it can also mean your handful of daily clicks gets spread across searches you’d never have picked.

What got switched on

According to Google’s developer post, it depends on which old setting you had:

Text customisation means Google writes its own variations of your headlines and descriptions; final URL expansion means Google chooses which page on your site to send people to. For the broad match group, Google says existing brand inclusions and exclusions (lists of brand names you’d told Google to target or keep away from) carried across.

How to check yours

Open the campaign’s settings. Google’s guide puts text customisation and final URL expansion under Asset optimisation, a panel of campaign-level settings, and says you can turn them off “individually in campaign settings”. Search term matching is turned off “in the ad group settings”. Then open your search terms report (the list of actual searches that triggered your ads) and read what you’ve paid for since early September.

Whether to keep it depends on the account. On a larger account with solid conversion tracking (a record of which clicks turned into enquiries), some of this can pull its weight. On a thin budget, I’d want to read the search terms before letting the machine widen them. Dynamic Search Ads campaigns (ads Google builds from the pages of your website) weren’t part of the September round; Google’s post schedules their migration for February 2027.

When is $20 a day the right amount?

When clicks are very cheap and you’re patient. On the September estimates, only the catering and vet searches clear three clicks a day at A$20, and for those a tightly targeted campaign can be a slow but useful test. Personal training and wedding photography sit just under that line too, so they’re a wait on my table, and landscaping, at about two a day, more clearly so.

It can also work as a controlled experiment if your tracking is already in place and you treat the first month as tuition. Searches on your own business name are another case where a small budget can make sense. People searching your name are usually already looking for you; the ad is there so a competitor bidding on your name is less likely to be the first thing they see.

Where it doesn’t make sense: plumbing, locksmith, electrical, roofing and legal searches, where a click ran from about A$27 to A$56 on these estimates, any search in the table that buys less than a click a day, and any business that can’t yet tell which enquiries came from ads. If that’s you, the money usually does more on the free foundations first. If you’re weighing ads against SEO, my piece on what SEO costs in Australia covers the other half of that decision. And once a campaign is running, how to tell if your Google Ads are working is the next read.

Free orientation vs paid diagnosis

This article can tell you whether your budget is in the right ballpark. It can’t see your account, your landing page, or whether your tracking is actually recording enquiries - and those have a big say in whether any budget works. The free Basic Digital Health Check looks at your advertising from the outside, including the landing pages your ads point to and whether the measurement underneath them holds up; the paid In-Depth version goes inside the account itself. The Google Ads health check page sets out what each version looks at. Either way I’ll tell you straight whether ads are even the right next move. Sometimes the answer is “not yet, sort the website first”, and that’s a good answer too.

Tools & Resources

Everything referenced above, in one place.

Free tools

• Google Keyword Planner guide - Google’s guide to its search and cost estimates for the searches you’d bid on (the Discover view shows top-of-page bid ranges, as above; the planner needs a Google Ads account with billing details entered)
• About payment settings - Google’s explanation of payment thresholds, including where to find yours

Checklists & templates

• The 10-minute budget check - cost per click → division → compare → monthly ceiling → AI Max → decide
• The September 2026 cost-per-click table - 21 Melbourne service searches, with the division already done

Further reading

• About spending limits - the 2× daily and (for most campaigns) 30.4× monthly limits, straight from Google
• How AI Max for Search campaigns works - Google’s own guide to the settings and where to turn them off
• How to tell if your Google Ads are working - my five-number check once a campaign is running

Look, $20 a day isn’t a silly number. It usually just gets picked before anyone’s done the division. Do that first. If it says wait, waiting is a decision too, and it’s a lot cheaper than a month of clicks you can’t learn from.