How to Set a Google Ads Budget That Actually Delivers Results
You’ve decided to try Google Ads. Good move. But now you’re staring at a screen asking you to set a daily budget and you have no idea what number to type in. Too low and you won’t get enough data to learn anything. Too high and you’ll blow through cash before you know what’s working. Most business owners either guess a number and hope, or set it so conservatively that the campaign never gets off the ground.
Stop picking a number that feels ‘safe.’ Your budget should be a calculation based on your goals and what it actually costs to get a click in your industry. Do it right and you’ll know exactly what each lead costs before you scale. Do it wrong and you’ll join the chorus of business owners who say “Google Ads doesn’t work.”
The Problem: Most Businesses Set Their Budget Backwards
The typical small business approach to Google Ads budgeting goes something like this: “I can afford to spend about $500 a month on advertising.” They set $16 a day, pick a few keywords, write a quick ad and wait for the phone to ring. Two weeks in, they’ve spent $250 and generated maybe two clicks that turned into nothing. They either double down blindly or pull the plug.
If you spend $500 when the data shows you need $1,500 to compete, you aren’t ‘saving’ $1,000. You’re wasting $500. Google’s algorithm needs a baseline of conversion data to learn who your buyers are. If your budget only buys 10 clicks a week, the machine never learns and your ads stay stuck in ‘Learning Mode’ indefinitely.
The other common mistake is spreading budget too thin across too many keywords, locations, or campaign types. A $1,000 monthly budget split across 50 keywords and three campaign types gives each keyword about 66 cents a day. That’s not a strategy. It’s noise.
Stop Buying Leads, Start Buying Data
Treat your first $2,000 as a tuition fee. For one of our trade clients, that initial spend proved that ‘emergency repair’ keywords converted at 22%, while ‘general maintenance’ keywords just ate budget. Without that ‘unprofitable’ first month, we never would have found the 406% ROI strategy we use now.
Once you have the data, you aren’t guessing anymore. You know exactly how much to spend to get the next lead.
Australian businesses typically see cost-per-click ranges between $1 and $8 for service-based keywords, depending on the industry and competition level. Legal and financial services sit at the top end. Trades, health and professional services usually fall between $2 and $5 per click.
How to Calculate the Right Budget for Your Business
1. Start with your target cost per acquisition
Work backwards from what a new customer is worth to you. If your average customer spends $2,000 over their lifetime and you’re comfortable spending 10% to acquire them, your target cost per acquisition (CPA) is $200. Write that number down.
2. Estimate your conversion rate
If you’ve never run Google Ads before, assume a 3% to 5% landing page conversion rate for a well-built page in Australia. That means for every 100 clicks, three to five people will fill in your form or call you. Using 3% gives you a realistic worst-case scenario for your planning.
3. Calculate your cost per lead
Take your estimated cost per click (say $3.50 for a healthcare practice) and divide by your conversion rate (say 4%). That gives you a cost per lead of $87.50. If your target CPA is $200 and you close one in three leads, your actual CPA is $262.50. That’s close. You can optimise from there.
4. Set your minimum monthly budget
You need enough clicks to be statistically meaningful. The general rule: aim for at least 200 to 300 clicks per month when starting out. At $3.50 per click, that’s $700 to $1,050 per month. Round it up to $1,000 as your starting floor.
For competitive industries (legal, finance, home services in metro areas), that floor might be $1,500 to $2,500.
5. Focus your budget on your best keywords
Don’t spread it. Pick your top five to eight keywords where search intent matches someone ready to buy or enquire. For a physiotherapy clinic, that might be “physio near me,” “physiotherapist [suburb],” and “back pain treatment [city].” Skip broad informational keywords like “what does a physiotherapist do” at this stage. Those are for SEO, not paid ads.
6. Set up conversion tracking before you spend a cent
If you don’t have conversion tracking live, don’t turn the ads on. You’ll have no way of knowing if that $1,000 spend resulted in ten phone calls or zero. We use Google Tag Manager to track every button click and form fill so every cent is accounted for.
What to Do This Week
Before you touch your Google Ads budget, do one thing: calculate your target CPA. Open a spreadsheet. Put in your average customer lifetime value. Decide what percentage you’ll invest to acquire each one. That’s your CPA target. Then estimate your industry’s average cost per click (Google’s Keyword Planner gives you ranges for free). Divide your CPA by the cost per click. That tells you how many clicks you can afford per lead and whether the numbers work before you spend anything.
If the math doesn’t add up, don’t run the ads. We’ve seen clients double their ROI just by fixing their landing page before spending a cent on Google. Ads just make your current situation louder. If your sales process is broken, ads will just help you lose money faster.
Frequently Asked Questions
How much should a small business spend on Google Ads in Australia?
Most Australian small businesses need a minimum of $1,000 to $2,500 per month to generate enough data for meaningful optimisation. The right number depends on your industry’s cost per click and how many leads you need each month.
Can I start Google Ads with $500 a month?
You can, but results will be limited. At $500 per month with a $3.50 cost per click, you’ll get roughly 140 clicks. That may not be enough to identify winning keywords or optimise effectively. Consider starting with a focused campaign on your top three keywords instead of spreading thin.
How long before Google Ads starts generating leads?
You can start seeing clicks within hours of launching. Meaningful lead generation data usually takes two to four weeks. Budget optimisation and consistent ROI typically require eight to twelve weeks of active management and testing.
Should I manage Google Ads myself or hire an agency?
If your budget is under $2,000 per month, self-management with Google’s tools and some education can work. Above $2,000, the complexity of bid strategies, audience targeting and ongoing optimisation usually justifies professional management. The agency fee should be offset by improved performance.
What’s a good cost per lead for Google Ads?
It varies enormously by industry. Healthcare practices in Australia typically see $50 to $150 per lead. Legal services can run $100 to $300. Trades and home services often achieve $30 to $80. A $200 lead is cheap if the job is worth $10,000. Focus on the margin, not just the lead cost.
The Bottom Line
A Google Ads budget isn’t a number you pick from thin air. It’s a calculation based on what a customer is worth, what clicks cost in your industry and the minimum data you need to make smart decisions. Get the maths right before you launch, focus your budget on a small set of high-intent keywords and treat the first two months as a data-gathering investment. Run the numbers first. It’s the difference between a campaign that generates 430 leads and one that gets turned off after a month because it ‘didn’t work.’
