How Much Should a Small Business Spend on Google Ads?

It's one of the first questions small business owners ask when they're thinking about paid search. How much do I need to spend?

The honest answer is that there's no universal number. A roofer in a small market might run a great campaign on $800 a month. A mortgage broker in a competitive city might burn through that in three days. Budget depends on your industry, your location, your goals, and what you can actually afford to pay for a customer.

Here's how to think about it instead of just picking a number out of the air.

Start With What a Customer Is Worth

Before you decide what to spend on ads, you need to know what a customer is worth to you. This is the single most important number in paid advertising and most small business owners haven't actually calculated it.

Two numbers matter here.

Average sale value. What does a typical customer spend with you the first time they buy?

Customer lifetime value. What does a typical customer spend with you over the entire time they do business with you?

A dentist might have an average first visit worth $200 but a lifetime value of $4,000 across years of cleanings, fillings, and family appointments. A roofer might have a one-time sale of $15,000 with very little repeat business. Those two businesses can afford radically different ad spend even if they're in the same town.

Once you know what a customer is worth, you can work backwards to figure out what you can afford to pay to get one.

The Numbers That Actually Determine Your Budget

A useful Google Ads budget is built from a few connected numbers, not a guess.

Cost per click (CPC). What you pay every time someone clicks your ad. Varies enormously by industry. Local services in small markets can be $2-5. Competitive industries like legal, insurance, or home services in major cities can be $30-100+.

Conversion rate. Of the people who click, what percentage actually become a lead or customer? A reasonable benchmark for a well-built small business campaign is 3-7%, but this depends heavily on the offer and landing page.

Cost per lead (CPL). Cost per click divided by conversion rate. If clicks cost $5 and 5% of them convert, your cost per lead is $100.

Close rate. Of the leads you get, what percentage actually become paying customers?

Cost per customer. Cost per lead divided by close rate. If your cost per lead is $100 and you close 25% of leads, your cost per customer is $400.

If your average customer is worth $1,200 and your cost to acquire one is $400, you have a 3x return. That's a campaign worth running. If your average customer is worth $500 and your cost to acquire one is $400, you're barely breaking even and need to either improve the funnel or rethink the channel.

Realistic Starting Budgets

For most local small businesses, here's what we typically see work.

$500-1,000 per month. This is the floor. Below this, you usually don't get enough clicks and conversions to learn what's actually working. You can run a tightly focused local campaign at this level if your CPCs are reasonable, but you have to be patient and disciplined.

$1,500-3,000 per month. This is where most local service businesses see real, measurable results. You have enough budget to run multiple ad groups, test creative, gather conversion data, and optimize based on what's actually performing.

$3,000-10,000 per month. This is the range for businesses with bigger service areas, higher-ticket products, or more competitive industries. At this level you can support multiple campaigns, run remarketing, and start scaling what's working.

$10,000+ per month. This is for businesses where Google Ads is a primary growth channel, with full-funnel tracking, multiple campaign types, and dedicated management.

A common mistake is starting too small to learn anything, getting frustrated, and pulling the plug before the campaign has had a chance to optimize. Google's algorithm needs data to perform. Starve it of data and it can't help you.

What Drives Costs Up or Down

A few factors swing your budget up or down significantly.

Industry competition. Insurance, legal, and finance keywords are some of the most expensive on the planet. Local trades, niche B2B, and specialty retail tend to be far cheaper.

Geography. Major metros cost more than smaller markets. A plumber in Cache Valley pays a fraction of what a plumber in Salt Lake or Denver pays for the same kind of click.

Seasonality. HVAC, landscaping, tax services, and tourism all have peak seasons. CPCs go up during busy times and down during slow ones.

Quality Score. Google rewards relevant, well-built campaigns with lower costs. A campaign with strong ad copy, tightly themed keywords, and good landing pages will pay less per click than a sloppy one targeting the same terms.

Your bidding strategy. You can bid manually, target a cost per acquisition, or maximize conversions. The right strategy depends on your account history and goals.

A Realistic Budget Framework

Here's a simple way to set your starting budget if you're not sure where to begin.

Take your average customer value. Divide by 3 to get your target cost per customer (a 3x return is a healthy floor for paid ads). Multiply that by the number of customers you want per month from this channel. That's your monthly budget.

So if a customer is worth $900, your target acquisition cost is $300. If you want 10 new customers a month from Google Ads, you're looking at a $3,000 monthly budget.

This is a starting framework, not a finish line. Real campaigns get optimized over time, and a well-managed account often improves on these numbers significantly. But it gives you a defensible number to start with instead of pulling one out of thin air.

The Bottom Line

There's no minimum spend that guarantees success and no maximum spend that guarantees failure. The right Google Ads budget for your business is the one where the math works. You can afford to acquire a customer for less than they're worth, with margin to spare.

If you don't know your customer value, calculate it before you spend a dollar on ads. If your funnel isn't converting, fix that before you increase spend. And if you're going to run paid search at all, commit enough budget and time to actually learn whether it works for your business. Half-hearted ad spend is the most expensive marketing there is.

Trying to figure out the right ad budget for your business? We help local businesses build paid strategies that actually pencil out. Let's talk.