How much should you actually spend on Google Ads?

The first question every business owner asks is the wrong one: “What’s the cheapest I can start with?” The number that matters isn’t the smallest you can spend — it’s the smallest that can actually work. Below that line, you’re not testing Google Ads. You’re donating to Google.

The floor is set by your market, not your comfort zone

Your budget isn’t a number you pick. It’s a number your market hands you. Three things decide it, and only one of them is under your control.

• Cost per click (CPC). Emergency plumbing in a competitive city runs €6–12 a click. A niche B2B service might be €2. You don’t choose this — the auction does.
• Clicks per lead. If 1 in 20 clicks becomes a call or form, you need 20 clicks to buy one lead. That’s your landing page and offer doing the work — or not.
• Leads you actually want. Ten a month? Thirty?

Multiply it out. €8 CPC × 20 clicks = €160 to buy one lead. Want ten leads? That’s €1,600/month, minimum, before anyone has optimised anything. Suddenly the “let’s try €150 and see” plan looks like what it is: budget for one lead, on a good month.

Why spending too little is worse than not advertising

Underfunding a campaign isn’t a smaller version of running one. It’s a different thing, and it fails on purpose.

• The algorithm can’t learn. Smart Bidding needs conversions to optimise toward. Feed it two a month and it’s guessing. It’s the same reason Performance Max quietly bleeds small accounts — no data, no learning.
• You never reach statistical daylight. Twelve clicks in a month tells you nothing. A good week and a bad week look identical to noise. You’ll “conclude” ads don’t work off a sample that couldn’t have proven anything either way.
• You burn the test. You spent €150, got no calls, and now you “know” Google Ads doesn’t work for your business. You don’t. You know €150 doesn’t work.

The daily-budget trap nobody explains

Here’s a mechanic Google buries in a help doc. You set a daily budget, not a monthly one — and Google can spend up to twice your daily budget on any given day. It only promises not to exceed 30.4× your daily budget across the month (Google’s own documentation).

So your real monthly spend is daily budget × 30.4. Set €10/day thinking “about €300” and you’re on the hook for €304 — and on a busy Monday it might spend €20 while you’re not looking. Always plan from the monthly number and divide down, never the other way around.

So what’s the actual minimum?

There’s no universal figure, because CPC is the whole game. But an honest floor for a local service business in Spain usually lands around €500–1,000/month in ad spend — enough to buy the clicks that generate leads and enough conversions for bidding to stop guessing. Below roughly €300/month, in most competitive local categories, you’re simply buying too few clicks to matter.

Note the words “ad spend.” That’s the money that reaches Google, separate from managing the account. If someone quotes you €300 all-in, ask how much of that Google actually sees — because an underfunded account, managed beautifully, still fails.

When the honest answer is “not yet”

Sometimes the right move is to not run ads. If the math says you need €1,500/month to compete and you have €300, ads aren’t your channel this quarter. That’s not a failure — it’s arithmetic. Better homes for that €300:

• Fixing the landing page so the clicks you eventually buy actually convert.
• Google Business Profile and local SEO, which can bring calls with no per-click cost.
• Waiting until you can fund a real test instead of a doomed one.

And if you already rank #1 organically, you might not need ads at all — we’ve written about exactly that.

FAQ

Can I start small and scale up? Yes — but “small” has a floor. Start below the level where bidding can learn and you’re not scaling a test, you’re funding noise. Start at the minimum that can work, prove it, then scale.

Does a bigger budget mean better results? Only up to your market’s ceiling. Once you’re capturing the available high-intent searches, extra budget buys weaker traffic. More isn’t the goal — enough is.

How much should go to management vs. ad spend? Ad spend goes to Google; management is a separate cost. Watch for “all-in” quotes where the real ad spend is too thin to work — you’d be paying someone to manage a campaign that was underfunded from day one.

The bottom line

Don’t ask “what’s the least I can spend on Google Ads.” Ask “what’s the least that can actually work in my market” — then decide whether that number is worth it. If it is, fund it properly. If it isn’t, spend the money somewhere it can win.

Want the honest number for your business? Tell us your service and city and we’ll run the math — and if the answer is “your budget’s better spent elsewhere right now,” we’ll tell you that instead of selling you a campaign that can’t win.