It is the question we get asked more than any other. A small business owner has a few thousand dollars a month to play with and wants to know what the right Google Ads budget is. The honest answer is that there is no universal number, and anyone who tells you there is has either not run the numbers or is selling you something.
A sensible budget depends on three things: how much an average sale is worth to your business, what your margin on that sale is, and how competitive your industry is in the Google Ads auction. Those three numbers change everything. A roofing business in Melbourne with a five-thousand-dollar average job can spend differently to a cafe selling a fifteen-dollar lunch, even if they both feel busy.
Work the budget backwards from a real target
The way to set a Google Ads budget is to reverse engineer it from what you actually want out the other end. Start with a target number of sales per month. Then work back through a realistic conversion rate from lead to sale for your business. Then back again through a realistic conversion rate from click to lead on your website. Then multiply by a rough cost per click for your industry.
As a rough example: if you want ten new customers, your sales team closes around one in three of qualified leads, you need thirty leads. If your landing page converts five percent of visitors into leads, you need six hundred clicks. If your industry averages around eight Australian dollars a click on search, that is around four thousand eight hundred dollars in ad spend a month, before management or tracking costs.
None of those numbers are guarantees. They are starting estimates. The point of running them is to find out whether the budget you have in mind is in the same postcode as the outcome you want, or whether the maths simply does not work.
Australian cost-per-click reality
Competitive industries in Australia carry high costs per click in Australian dollars. Trades, solar, legal, finance, dental, cosmetic and any service tied to a high-value transaction all sit at the top of the auction. A click on a search like "emergency plumber Melbourne" or "solar installation Sydney" is not three dollars. It can be twenty, thirty, sometimes more depending on the time of day and the postcode.
That does not mean those industries should not run Google Ads. It means the budget needed to gather enough conversion data to optimise an account is higher than people expect. Google's bid strategies need conversions to learn from. If your daily budget only buys you a handful of clicks, the algorithm never gets enough signal, and you end up paying for an expensive education that goes nowhere.
Why a budget too small almost always fails
The biggest reason small Google Ads accounts underperform is not bad targeting. It is starvation. Spreading a tiny budget across search, display, Performance Max and YouTube at the same time guarantees that none of the campaigns get enough data to optimise. The account stays in a permanent cold start.
The fix is focus. Pick the one or two campaign types most likely to bring in qualified buyers, point the budget at them, and accept that the rest can wait. For most service businesses, that means search campaigns on high-intent keywords first, then expanding once the data tells you what is working.
The true cost is more than the ad spend
Your real Google Ads budget includes three things: the spend that goes to Google, the cost of having the account managed properly, and the cost of setting up the tracking and the landing pages that turn those clicks into customers. Skipping any of those three is what makes most accounts feel like they are wasting money.
If your website is slow, hard to read on a phone or has a contact form that nobody fills in, more ad spend will not save it. The cheapest way to improve your cost per lead is often to fix the page the ad sends people to, not to bid harder. We wrote separately about why your website might not be converting if you want to dig into that side.
The sensible approach
Start at a level that can buy enough data to know whether it is working, not a level that just keeps the lights on in your account. Run it long enough to see real conversion patterns, usually a couple of months at minimum. Track the right things, cost per qualified lead and cost per sale, against your margin. Then scale what is genuinely profitable and cut what is not.
Anyone promising you a guaranteed return on Google Ads is guessing. The auction changes, competitors change, your offer changes. What a good operator can do is give you an honest assessment of whether your numbers stack up, build the account properly, and be straight with you about what is working and what is not.
If you want a second opinion on what a realistic budget looks like for your business, that is exactly what our Google Ads management service is built around.
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