Google Ads Budget Calculator: How Much Should You Spend?

By Evoke Agency · Last updated October 30, 2026

A Google Ads budget calculator works backward from the customers you want. The formula: new customers ÷ close rate = leads, leads ÷ website conversion rate = clicks, and clicks × average cost per click = your monthly budget. Divide that by 30.4 to get the daily budget you set in Google Ads.

"How much should I spend on Google Ads?" is one of the first questions small business owners ask, and "it depends" is the most common, least useful answer. This free calculator starts from the number you actually care about, new customers, and shows the monthly budget and daily budget setting it takes to get there.

How do you use the Google Ads budget calculator?

1. Enter the new customers you want per month. How many new paying customers do you want from Google Ads specifically? Be realistic: this is the number from ads, not your whole business.
2. Enter your lead-to-customer close rate. Out of every 10 people who call or fill out a form, how many end up buying? If 3 out of 10 do, enter 30%. Your CRM, your booking software or an honest look at last month's calls will tell you.
3. Enter your website conversion rate. Out of every 100 people who click your ad, how many call or submit a form? If you're already running ads, this is in your Google Ads account under conversions. If you're not, start with a conservative guess and update it after a month of real data.
4. Enter your average cost per click. If you have an account, use your actual average CPC. If you don't, Google's free Keyword Planner shows estimated bid ranges for the keywords you'd target in your area.
5. Add average revenue per new customer (optional). Add this to see your projected revenue and return on ad spend, then read the results and the one-sentence summary.

How do you calculate a Google Ads budget?

Formula
Leads needed = new customers ÷ close rate
Clicks needed = leads needed ÷ website conversion rate
Monthly budget = clicks needed × average cost per click
Daily budget = monthly budget ÷ 30.4
Cost per lead = monthly budget ÷ leads
Cost per new customer = monthly budget ÷ new customers
ROAS = (new customers × revenue per customer) ÷ monthly budget

Leads and clicks are rounded up to whole numbers, because you can't get half a phone call.

Why divide by 30.4 for a daily budget?

Google Ads budgets are set per day, and Google uses an average of 30.4 days per month when it calculates your monthly spending limit (average daily budget × 30.4). Dividing by 30.4 gives you the daily number to type into your campaign settings. Keep in mind Google can spend more than your daily budget on a busy day, but over a month it shouldn't go past that limit.

What does a Google Ads budget look like for a local business?

A Twin Cities remodeling company wants 10 new customers a month from Google Ads. They close about 25% of the leads they get, their landing page turns about 7% of clicks into calls or forms, and their average cost per click is $3.50. A typical new customer is worth about $1,500.

These example inputs are just that: examples to show the math. Your cost per click, conversion rate and close rate depend on your industry, your area, your offer and your competition, so plug in your own.

One important note: that 7.5x is based on revenue, not profit. To see if the ads are actually making money after your costs, compare it to your break-even ROAS, which is 1 ÷ your gross profit margin.

How can you get more customers from the same Google Ads budget?

The useful part of working backward is that you can see which number matters most. Try changing one input at a time:

• Improve your close rate from 25% to 35% and you need fewer leads for the same 10 customers. That's a sales process fix: answering the phone faster, following up the same day, and sending quotes quickly. We've written about this in why your ads are generating leads but not booked jobs.
• Improve your website conversion rate and every click works harder. A fast, mobile-friendly landing page with a clear phone number, real photos and reviews will usually do more than a generic home page.
• Lower your cost per click with tighter keywords, better ad relevance, negative keywords that block junk searches, and targeting the towns you actually serve.

Most small businesses try to fix Google Ads by spending more. Often the cheaper fix is further down the funnel.

How should Minnesota small businesses budget for Google Ads?

If you serve a specific area, like Hopkins, St. Louis Park, Minnetonka, Edina or the whole Twin Cities metro, you have an advantage over national companies: you only have to pay for clicks from people you can actually serve.

• Target by location, not just keyword. Set your campaign to the cities or radius you serve, and use "presence" targeting so you're paying for people in your area, not people just reading about it.
• Expect costs to vary. Costs per click can differ a lot between busy metro areas and smaller towns, and between quiet months and peak season.
• Plan around the seasons. A landscaper or deck builder in Minnesota might run a bigger budget from March to September and scale down for winter. A heating or snow removal company might do the opposite. Run this calculator for your busy season and your slow season separately.
• Pair ads with your Google Business Profile. Many local searchers see the map results and the ads on the same screen. A strong profile with recent reviews helps both.

Frequently asked questions

How much should a small business spend on Google Ads?

Work backward from your goal: new customers ÷ close rate gives you leads, leads ÷ conversion rate gives you clicks, and clicks × cost per click gives you a monthly budget. The right number is the one that gets you enough customers at a cost per customer you can afford.

What daily budget should I set in Google Ads?

Divide your monthly budget by 30.4. Google uses 30.4 as the average number of days in a month, and your monthly spending limit is your average daily budget × 30.4.

How many clicks does it take to get one customer?

Divide 1 by (website conversion rate × close rate). At a 7% conversion rate and a 25% close rate, that's 1 ÷ (0.07 × 0.25), or about 57 clicks per new customer.

What is a good cost per lead for Google Ads?

It depends on what a customer is worth to you. A $50 lead is expensive for a $40 sale and cheap for a $15,000 remodel. Compare your cost per new customer to the gross profit from that customer to decide.

Where can I find my average cost per click?

In your Google Ads account, add the "Avg. CPC" column to your campaigns or keywords. If you're not advertising yet, Google's Keyword Planner shows estimated top-of-page bid ranges for keywords in your location.

Is the ROAS in this calculator profit?

No. It's revenue divided by ad spend. To see whether the ads make money after the cost of delivering the work, compare it to your break-even ROAS, which is 1 ÷ your gross profit margin.

How long before Google Ads starts working?

Ads can show up the same day your campaign is approved, but the first few weeks are usually a learning period while you collect conversion data and trim wasted searches. Judge results on at least a month of data, not a few days.

Want help hitting your number?

Evoke Agency manages Google Ads for local Minnesota small businesses, from keyword research and landing pages to tracking calls and booked jobs. Read more about our approach to Google Ads management for small businesses, or talk to Evoke about your budget.

How can I add this calculator to my website?

Write about small business, home services or local marketing? Point your readers to this free Google Ads budget calculator. Copy and paste the badge below:

<a href="https://evokeagency.co/blog/google-ads-budget-calculator" target="_blank" rel="noopener" title="Free Google Ads Budget Calculator by Evoke Agency" style="display:inline-block;padding:12px 18px;border-radius:999px;background:#070f20;color:#ffffff;font:600 15px/1.3 Arial,Helvetica,sans-serif;text-decoration:none;border:2px solid #15ebaa;">Free Google Ads Budget Calculator &rarr;</a>
<p style="font:13px/1.5 Arial,Helvetica,sans-serif;margin:8px 0 0;">Try the free <a href="https://evokeagency.co/blog/google-ads-budget-calculator">Google Ads budget calculator</a> by <a href="https://evokeagency.co">Evoke Agency</a>, a Minnesota marketing agency.</p>