How Much Should a Small Business Spend on Google & Facebook Ads?

Almost every small business owner asks the same question before running paid ads: how much is this going to cost me? Then they get three different answers. A friend says $200 a month is plenty. An agency says $5,000 to start. Facebook itself happily takes $10 a day. Everyone is sort of right, which is exactly why it feels confusing.

So here is a straight answer for 2026. This is what small businesses actually spend on Google and Facebook ads, the rule of thumb that keeps you from overspending, the minimum budget you need to learn anything useful, and the one habit that quietly burns money. None of this is financial advice, and results vary a lot by industry, but the numbers below are real and current.

The rule of thumb: a percentage of revenue

The cleanest way to set an ad budget is to tie it to revenue instead of guessing a flat number. Most small businesses spend somewhere between 5% and 20% of revenue on marketing, and ads are one slice of that (Mercury). Gartner’s 2025 CMO survey put the average marketing spend at 7.7% of revenue across companies (Mercury).

Where you land depends on your stage:

• Early or pre-revenue: 10% to 20% of projected revenue (Mercury).
• Growing: 7% to 10% of revenue (Mercury).
• Stable or mature: 4% to 7% of revenue (Mercury).

So a shop doing $40,000 a month while trying to grow might put 8%, or about $3,200, toward marketing, with maybe half of that going to paid ads. That is a sane starting point, not a magic formula.

Google vs. Facebook: two very different jobs

Before you split a dollar between the two, understand that they do different work. Treating them the same is where most budgets go sideways.

Google Search ads catch people who already want what you sell. Someone types “emergency plumber near me” and you show up. That is high intent, and it converts well. The catch is you pay for that intent. The average cost per click across Google Ads in 2026 is $5.42, with a typical conversion rate of 8.18% and an average cost per lead of $66.69 (WordStream).

Facebook and Instagram ads create demand. Nobody is searching for your service in their feed. You interrupt them with something good enough to make them stop scrolling. That is cheaper per click but lower intent. Blended cost per click on Meta runs around $0.87, with a CPM (cost per thousand views) near $16.80 in the US (AdManage.ai).

Our honest opinion: if you have a limited budget and you sell something people actively search for, start with Google Search. The leads are warmer, and you waste fewer dollars teaching strangers who you are. Use Facebook once you have a margin to spend on building demand.

What different industries actually pay on Google

That $5.42 average hides huge swings. A click costs what your competitors are willing to pay for it, and some industries bid hard:

Industry	Avg. Google CPC
Restaurants & food	$2.05
Travel	$2.14
Real estate	$3.22
Finance & insurance	$3.39
Dentists	$8.00
Home improvement	$8.33
Attorneys & legal	$9.87

Source: WordStream 2026 Google Ads Benchmarks.

If you are a personal injury attorney, a single click can cost more than a restaurant pays for ten. That is not a reason to avoid ads. It is a reason to budget honestly for your category instead of someone else’s.

The minimum budget to learn anything

Here is the part nobody likes. There is a floor below which ads simply can’t work, because the platforms need data to optimize.

On Meta, an ad set usually needs roughly 50 conversions to exit the “learning phase” and stabilize (AdManage.ai). If your cost per lead is $30, that is $1,500 of spend just to give the algorithm enough signal to work with. Spend $150 over a weekend and you learn almost nothing.

For most local small businesses, a realistic floor is $500 to $1,000 a month on Facebook ads and $1,500 to $5,000 a month on Google Ads, depending on how competitive your keywords are (AdManage.ai on Facebook, WordStream). Below those numbers you are usually paying for an experiment that never gets enough data to draw a conclusion.

A budget table by stage and goal

Use this as a starting map, then adjust for your industry’s click costs.

Stage / goal	Suggested monthly ad budget	Where to put it
Testing the waters	$500–$1,000	One channel, one offer
Steady local leads	$1,500–$3,000	Google Search first, Facebook second
Aggressive growth	$3,000–$8,000+	Both channels, split by what converts
Seasonal push	2–3x normal, short term	The channel that already works

These are ballparks. A high-margin service can justify spending more per lead than a low-margin retailer, which brings us to the number that actually matters.

How to read ROAS and cost per lead

Spend is only half the equation. What comes back is the other half. Return on ad spend (ROAS) tells you how many dollars you earn per dollar spent. A good ROAS generally falls between 2:1 and 4:1, meaning $2 to $4 back for every $1 in (Landingi).

But “good” depends entirely on your margins. Your break-even ROAS equals 1 divided by your profit margin, so a product with a 25% margin needs a 4.0 ROAS just to break even, while a digital product at an 80% margin breaks even at 1.25 (Landingi). A 3:1 ROAS can be a win for one business and a slow loss for another.

For lead-based businesses, watch cost per lead and, more importantly, cost per closed customer. If a $66 Google lead turns into a $4,000 roof job and you close one in five, the math is great. Track it that far, or you are flying blind.

The mistake that quietly burns money

Boosting random posts. The blue “Boost Post” button on Facebook is the easiest way to spend money and the worst way to get customers. It optimizes for likes and reach, not leads or sales, and it gives you almost no control over targeting or where the click goes.

Real campaigns have a goal, a landing page built to convert, and a way to measure results. A boosted post has a thumbs-up count. If your ads aren’t sending people to a page that turns visitors into inquiries, even cheap clicks are wasted. A good campaign and a good website work together, which is also why your small business website checklist matters before you spend a dime on traffic. And if people are searching your service but not finding you at all, paid ads are a patch over a bigger problem we cover in why your business isn’t showing up on Google.

This is the work MGT Techware does day to day. We build and manage Google and Facebook ad campaigns for businesses across the US, from our base in Dallas–Fort Worth, and we tie every dollar to a landing page that actually converts. Tell us your budget and goal and we’ll tell you honestly whether ads make sense yet.

So what should you spend?

Start with revenue, not a random number. Pick one channel that matches your buyer. Fund it above the learning-phase floor so it has a fair shot. Then measure ROAS against your real margins, not a benchmark you read online.

One honest gap: no article can hand you your exact number, because it depends on your industry’s click costs, your margins, and your close rate. Anyone who quotes a guaranteed return without asking about those is selling, not advising. Still on the fence about whether you even need a stronger online presence first? We covered that in do I really need a website for my small business.

That planning part is free with us. Claim a free demo and we’ll map a realistic ad budget and what it should return for your specific business — no jargon, no pressure.

MGT Techware builds custom websites and runs digital ad campaigns for businesses across the US, from our home base in Dallas–Fort Worth. We handle strategy, ads, and the landing pages behind them so your budget actually turns into customers.