How Much Should Your Google Ads Budget Be Per Month?
- Jesse Heslinga
- 3 hours ago
- 8 min read
It's the first question almost every (new) business owner asks me, and it's the one with the least satisfying answer online. Search it and you get a shrug: "it depends." True, but useless. You have a real decision to make and a real number to put in a budget field.
The right number is a calculation, built from two things you can actually work out: how many leads you want, and what a lead costs in your market. This post gives you the formula, the current 2026 numbers to plug into it, and the honest floor below which Google Ads simply can't work. Read it and you'll come out with a real number for your own business.
The Short Answer
There's no universal number. Your monthly budget = the leads you want per month × your cost per lead. Cost per lead = average cost per click ÷ your conversion rate.
In 2026 the average Google Ads cost per lead across industries is about $67, but it swings from ~$40 (medical) to ~$132 (legal). Your vertical decides your number far more than any "recommended budget" does.
There's a hard floor: Google's Smart Bidding needs roughly 30 conversions in 30 days to work properly. So your real minimum is your cost per lead × 30. For a lot of lead-gen accounts that lands at €2,500 to €3,000/month, well above the "€500 to try it out" most people expect.
Spending more doesn't buy leads in a straight line. You're bidding in a live auction you don't control, so past a point you pay escalating prices for lower-intent clicks.
The honest answer: it comes down to a calculation
Anyone who gives you a flat "spend €2,000 a month" without asking about your business is guessing. The right budget falls out of three things: how many new customers you need, how many leads it takes to land one, and what each lead costs to generate in your market.
Work backwards from the goal. If you need 6 new customers a month, you close 1 in 4 leads, and a lead costs you €100, then you need 24 leads, which is €2,400/month in ad spend. That's a real number tied to your business, and you can defend every part of it.
Verdict: the question to ask is "how many leads do I need, and what does a lead cost me." The budget is the answer to those two, nothing more.
Pro Tip: Do this math before you look at what you can afford. If the number your goals require is bigger than your budget, that's useful information: it means you need one of three things, a bigger budget, a better conversion rate, or a more focused campaign. Better to know that now than three months into an underfunded account wondering why it isn't landing.
The formula (with a worked example)
Two ways to write the same thing.
The simple version:Monthly budget = leads you want per month × cost per lead
The version that shows where cost per lead comes from:Cost per lead = cost per click ÷ conversion rateSo: Monthly budget = target leads × (cost per click ÷ conversion rate)
Let's run real 2026 numbers for a home-services business:
Average cost per click: $8.33
Landing page conversion rate: 8%
So cost per lead = $8.33 ÷ 0.08 = about $104 per lead
You want 30 leads a month → 30 × $104 = about $3,100/month
Cross-check it in clicks: 30 leads at an 8% conversion rate needs ~375 clicks, and 375 × $8.33 is ~$3,120.
Same answer.
The two levers you actually control here are your conversion rate (a better landing page literally lowers your cost per lead) and your targeting (tighter keywords mean fewer wasted clicks). The cost per click, mostly, the market sets for you.
What clicks and leads actually cost in 2026
Here's where your vertical does most of the work. These are the 2026 benchmarks from WordStream/LocalIQ (13,000+ US search campaigns, medians to keep outliers from skewing it). Currency is US dollars, but the relationships hold in euros and pounds: legal is always dear, medical converts well, finance clicks are cheap but convert poorly.
Industry | Avg. cost per click | Avg. conversion rate | Avg. cost per lead |
Attorneys & legal | $9.87 | 5.55% | $131.63 |
Home & home improvement | $8.33 | 8.05% | $90.92 |
Dentists & dental | $8.00 | 10.67% | $72.97 |
Physicians & medical | $4.76 | 12.43% | $40.04 |
Finance & insurance | $3.39 | 2.64% | $74.44 |
Real estate | $3.22 | 3.70% | $102.51 |
All industries (avg) | $5.42 | 8.18% | $66.69 |
Treat it as a starting point. A well-run account with tight targeting and a good landing page beats these numbers; a loose one on default settings does worse. But notice the spread: a legal lead costs more than three times a medical one. This is exactly why a one-size "recommended budget" is meaningless. Find your row, plug your cost per lead into the formula, and you've got a grounded starting figure.
Keep in Mind: these are averages, and averages hide the account. Two roofers in the same city can see double the difference in cost per lead purely down to who's running the account better. The benchmark gives you a rough range to expect; your real number depends on how well the account is run.
“A home-services client was spending €4.000 a month spread across five campaigns, none of which ever gathered enough conversions to bid well. We put the same budget behind one focused campaign, cleared the 30-conversions-a-month mark, and we hit well below our target of €65 cost per lead, on the same spend.”
The minimum Google Ads budget that actually works
This is the part the "just try it with a small budget" crowd skips. Google's Smart Bidding, the automation that now runs bidding on most accounts, needs data to learn. The working rule: roughly 30 conversions in a rolling 30-day window before it optimises reliably. Starve it of that and it bids half-blind, and your cost per lead climbs.
So your real floor comes from your own math:
Minimum monthly budget ≈ your cost per lead × 30
If a lead in your market costs €100, that's €3,000/month just to feed the algorithm enough signal to do its job. If you're in a cheaper vertical at €40 a lead, more like €1,200. That's why the generic "€1,000 minimum" you see everywhere is fine for some verticals and far too low for legal, home services or anything with expensive clicks.
Verdict: below the floor, Google Ads underperforms because it never gathers enough data to work well. If your budget can't clear cost-per-lead × 30, either narrow the campaign hard (one service, one area, high intent only) so the few conversions concentrate, or wait until it can.
Common mistake: splitting a small budget across many campaigns "to test everything." A €900 budget across five campaigns is five campaigns that never learn. The same €900 behind one tight campaign at least has a chance to clear the threshold. Concentration beats spread at low budgets, every time.
Why "just spend more" doesn't buy proportional leads
It's tempting to think budget works like a dial: double it, double the leads. Sadly, this is not how the Google Ads auction works.
Every time someone searches, Google runs a live auction in milliseconds. You set your max bid and your budget, but the price you actually pay is set by your competitors. As you push for more volume, you start winning auctions you were previously priced out of, and those extra clicks are usually lower intent and more expensive. So the curve flattens: the first €2,000 might get you 20 leads, the next €2,000 maybe 12.
You also can't see what you're up against. Auction Insights shows who you compete with but deliberately hides their bids and budgets. So a rising cost per click with falling impression share usually just means a competitor decided to bid harder this quarter, and there's no button that fixes that by spending blindly.
Verdict: find your efficient spend, the point where each extra euro still brings a profitable lead, and grow the budget as the account earns it. Cranking spend to "win" position is how you burn money fast.
Why it's more expensive than it used to be
If Google Ads feels pricier than you remember, you're right. Average cost per click has roughly doubled over the last decade, and it rose year-on-year for the large majority of industries through 2025.
There's a 2026 twist too. More searches now end without any click at all (around two-thirds, per SparkToro's 2026 data), partly because AI Overviews answer the question right on the results page. Fewer clickable results means paid ads compete for a share of a smaller pool, which keeps upward pressure on prices. None of this makes Google Ads a bad bet for lead gen, high-intent commercial searches ("emergency plumber near me") still very much get clicked, but it does mean a passive, underfunded account gets squeezed harder every year.
Verdict: budget for the market you're in now. Prices have climbed over the years, and the floor has quietly risen with them.
How I handle this for lead-gen businesses
I start with the client's numbers: how many jobs do you need, what's a customer worth, what's your close rate. From there the required lead volume is obvious, and the budget falls out of the cost per lead in your market. If the math says the goal needs more than the budget allows, I say so plainly rather than quietly underspending and blaming the channel later.
Then I make the budget work harder: tight, high-intent keywords first, clean conversion tracking so Smart Bidding learns from real leads, and enough concentration that campaigns actually clear the learning threshold. A focused €2,000 beats a scattered €4,000 more often than people expect. The budget is only ever as good as the account spending it.
Ready to work out your actual number?
If you're guessing at a budget or quietly suspect you're underspending (or overspending on the wrong clicks), it's worth ten minutes on the real math. I'll look at your market, your conversion economics, and what you're currently getting, and tell you straight what it should be.
Frequently Asked Questions
What is the minimum budget for Google Ads?
There's no fixed minimum, but there's a real floor: Smart Bidding needs roughly 30 conversions a month to work well, so your minimum is about your cost per lead times 30. For cheap verticals that's ~€1,200/month; for legal or home services with expensive clicks it's often €2,500 to €3,000. Below the floor, narrow the campaign hard so conversions concentrate.
How do I calculate my Google Ads budget?
Work backwards from leads. Budget = leads you want per month × cost per lead, and cost per lead = average cost per click ÷ your conversion rate. Example: at an $8 click and an 8% conversion rate, a lead costs ~$100, so 25 leads a month needs ~$2,500. Tie the number to your own goals rather than a generic benchmark.
Is €500 a month enough for Google Ads?
Usually not, unless you're in a cheap-click vertical and run one very tight campaign. At a typical €80 to €130 cost per lead, €500 buys 4 to 6 leads a month, far too few for Smart Bidding to learn from. It tends to underperform and get blamed on the channel. Either concentrate it hard or wait until you can fund the floor.
Will spending more get me more leads?
Up to a point, then it flattens. You bid in a live auction you don't control, so past your efficient spend each extra euro wins lower-intent, pricier clicks. Doubling budget rarely doubles leads. Find the point where each added euro still brings a profitable lead, and grow the budget as the account earns it.
How much do most small businesses spend on Google Ads?
Commonly €1,000 to €5,000/month, but that range is almost meaningless on its own because your vertical sets your cost per lead. A dental practice and a law firm chasing the same number of leads will spend very different amounts. Run the leads × cost-per-lead math for your own business rather than copying a "typical" figure.
Should I set a daily or a monthly budget in Google Ads?
Google Ads uses a daily budget, and it can spend up to roughly twice it on a given day, balancing out to about your daily budget × 30.4 over the month. So set daily = your monthly target ÷ 30.4, and think in monthly terms for planning. Don't panic at a single day that overspends; watch the monthly total.
How long before I know if my budget is working?
Give it enough time to gather conversions and clear the learning phase, usually a few weeks to a month or two, depending on how fast you hit ~30 conversions. Judge it on cost per qualified lead and booked jobs rather than day-one clicks. And remember every big change restarts the learning period, so resist the urge to keep tinkering.
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