How much should a small business spend on Google Ads? A realistic way to set your budget

Short answer: the right budget comes from working backwards from one question: how many new customers do I want each month? Once you know what a customer costs you to win, the budget falls out of the maths. For most local service businesses, a sensible starting point is a budget that buys at least 10 to 15 clicks a day, increased as the numbers come in.

Below, we walk through how to calculate it, using the real numbers from one of our campaigns.

Where does your money actually go?

With Google Ads you don’t pay for your ad to be shown. You pay when someone clicks it. The price of a click isn’t fixed: it depends on how many competitors are bidding on the same search and how much they’re willing to pay.

You set your budget per day, and two rules are worth knowing:

• On days with heavy search volume, Google can spend up to twice your daily budget.
• Across a calendar month, it will never bill you more than 30.4 times your daily budget.

So a daily budget of 50 means a monthly spend of at most about 1,520, whatever your currency. No surprise invoices.

The right way to set a budget: work backwards

Most business owners start with “let’s put a few hundred a month in and see what happens”. A better approach is to start from your goal and work backwards. You need three numbers:

1. Cost per click: the average price of a click in your industry. Google’s free Keyword Planner gives you an estimate.
2. Enquiry rate: out of 100 people who visit your site, how many call you or send a message.
3. Close rate: out of 10 people who get in touch, how many actually become customers. You know this better than anyone.

The formula is simple:

Cost per customer = Cost per click ÷ (Enquiry rate × Close rate)

Once you know that, your monthly budget = the number of customers you want × cost per customer.

A real example: a cleaning company in Istanbul

Let’s swap theory for real numbers. In August 2026 we built a website from scratch for İşimiz Temizlik, an Istanbul cleaning company, and launched their Google Ads. Here are the results after seven weeks (figures in Turkish lira):

Metric	Value
Total ad spend	19,206 TRY
Clicks	8,088
Average cost per click	≈ 2.37 TRY
Customer enquiries (WhatsApp and calls)	963
Enquiry rate	11.8%
Cost per enquiry	≈ 20 TRY
Enquiries that became jobs	about one in five (~190 customers)
Ad cost per customer	≈ 100 TRY

Click prices in your market will be different, but the ratios are what matter. Against the value of a cleaning job, an ad cost of about 100 TRY per customer is very profitable. An owner who knows this number stops asking “how much should I spend?” and starts saying “if I want 50 new customers a month, I need to spend about 5,000 TRY.”

One caveat: these numbers vary by industry and location. In businesses like removals, renovation or heating repair, clicks are usually more expensive, but each customer is worth more too. What matters is measuring your own numbers.

A practical rule for your starting budget

If you don’t have your own numbers yet, start like this:

• Set a budget that buys at least 10 to 15 clicks a day. Anything less doesn’t give Google enough data to learn from.
• Treat the first month as a learning period. Don’t change the budget or settings every day; each change sends the campaign back to square one.
• Don’t launch without tracking. Without conversion tracking that reports every call and message from your website back to your ad account, you’ll never know which spend brought in customers.
• Review the numbers after a month. What did each enquiry cost, and how many became customers? If it’s profitable, increase the budget step by step.

Five common mistakes that waste your budget

1. Advertising without conversion tracking. If Google doesn’t know who became a customer, it optimises for clicks, and clicks don’t pay invoices.
2. Showing ads to a whole country. If you only serve certain neighbourhoods or towns, limit your ads to those areas.
3. Sending ad clicks to your homepage. Someone who clicks your ad should immediately see the service they searched for, plus a call or WhatsApp button.
4. Missing enquiries after hours. If you reply in the morning to a message sent at night, that customer may already have booked a competitor.
5. Giving up in week one. Ups and downs during the learning period are normal. Look at at least three to four weeks of data before you decide.

When should you increase your budget?

The rule is simple: if your cost per customer is clearly lower than what a customer earns you, and you have the capacity to take on the work, increase the budget. Do it gradually, for example by 20 to 30 percent a week. Doubling the budget overnight can push the campaign back into a learning period.

If you’re already at capacity, pausing the campaign for a while instead of raising the budget is a perfectly sound decision.

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Want a realistic starting budget for your own business? Message us on WhatsApp and we’ll come back with numbers for your industry and area. You can also check whether your website is ready for ads with our free site audit.