Google Ads Budget for Small Business: How Much to Spend

"How much should I spend?" is the first question nearly every business owner asks me, and the honest answer is that it depends on your numbers, not on a rule of thumb. The good news is that the numbers are not hard to find, and once you have them the budget mostly works itself out.

The three numbers that decide your budget

1. What a click costs

This varies enormously by industry and location. A click for a local electrician costs very differently from a click for a law firm or an online clothing store.

You can get a realistic estimate for free from Google Keyword Planner, inside your Google Ads account. Enter the searches your customers would use, set your location, and look at the "top of page bid" range. That is roughly what you will pay per click to appear prominently.

2. How many visitors become enquiries

This is your conversion rate: of every hundred people who click your ad and land on your website, how many call, fill in the form or buy?

If you have run ads before, the answer is in your account. If you have not, you will not know it yet, which is one reason the first month should be treated as a measured test rather than a final verdict.

3. What an enquiry is worth to you

Work this out from your own sales: of every ten enquiries, how many become customers, and what is the average customer worth to you in profit, not revenue? That tells you the most you can afford to pay for an enquiry and still come out ahead.

Putting the numbers together

Here is the method with an illustrative example. These figures are made up to show the arithmetic, not taken from any client.

Say clicks in your market cost about $3, and about 1 in 20 visitors enquires. Each enquiry then costs around $3 × 20 = $60.

Now say roughly 1 in 4 enquiries becomes a customer. Each new customer costs about $60 × 4 = $240 in ad spend.

If a new customer is worth $1,000 in profit to you, Google Ads is clearly worth doing at that cost. If a customer is worth $150, it is not, at least not until the conversion rate improves.

Once you know your cost per customer, the budget question becomes: how many new customers a month do you want, and can you handle? Ten customers at $240 each is a $2,400 monthly budget.

The minimum that lets an account learn

There is a floor below which Google Ads stops being useful, and it is the mistake I see most in small accounts.

If your budget buys only two or three clicks a day, it can take weeks to collect enough enquiries to tell what is working. Meanwhile Google's automated bidding has almost nothing to learn from. The account looks expensive and inconclusive, and the owner concludes that "Google Ads does not work for us" when it never had a fair chance.

As a working principle, the budget should buy enough clicks every day to produce a steady trickle of enquiries, not one every fortnight. If it cannot, you have two options:

• Narrow the targeting to fewer, higher-intent searches and a tighter area, so the same money buys more relevant clicks.
• Put everything into one campaign rather than spreading it across five. Five campaigns on a small budget means five campaigns that each learn nothing.

A tight budget, well aimed, can work very well. One of my clients ran on $50 a day and brought cost per acquisition down from $25 to $8. In another account, $2.57K of spend returned $27.4K in a month. Neither had a large budget. Both had a concentrated one.

How Google actually spends your daily budget

This catches people out, so it is worth knowing before you set a number.

Your "daily budget" is an average, not a hard daily cap. On days with more searches, Google can spend up to twice your daily budget. Across a month, it will not charge you more than your daily budget multiplied by 30.4, the average number of days in a month.

So a $50 daily budget means up to about $1,520 a month, with some days above $50 and some below.

Should you spend more in the first month?

Not necessarily more, but you should expect the first month to cost more per enquiry than month three. The first weeks are spent finding which searches convert and cutting the ones that do not.

What matters in month one is that conversion tracking works, so every enquiry is counted and tied to the search that produced it. Spending without tracking is the most expensive mistake in Google Ads, because you pay and learn nothing.

When to increase your budget

Increase when two things are true:

• Your cost per customer is comfortably below what a customer is worth, and stable over several weeks.
• The account is being held back by budget. In Google Ads this shows up as campaigns marked "Limited by budget" and a meaningful share of searches lost to budget.

Increase in steps, perhaps 20 to 30 percent at a time, and watch the cost per enquiry. If it holds, keep going. If it rises sharply, you have found the edge of the profitable searches for now.

Frequently asked questions

Is $500 a month enough for Google Ads?

It can be, for a local business with affordable clicks and a tight target area, if the budget is concentrated in one campaign aimed at high-intent searches. Work it through with your own cost per click: if $500 buys only a handful of clicks a day, narrow the targeting before concluding it does not work.

Can Google Ads spend more than my daily budget?

On individual days, yes, up to twice your daily budget when there are more searches. Over a month, Google will not charge more than your daily budget multiplied by 30.4, so your monthly cost stays within a predictable limit.

Should I split my budget across Search, Display and Performance Max?

On a small budget, usually not. Splitting a limited budget across several campaign types means none of them gathers enough data to work well. Most small businesses do better starting with one well-structured Search campaign and expanding once it is profitable.

How long should I run Google Ads before deciding if it works?

Give it at least two to three months with working conversion tracking. The first month is largely about learning and cutting waste. Judging the channel on the first few weeks, before the account has enough data, is how many businesses give up on something that would have worked.