Your Google Ads Budget Is Decided by 30 Conversions, Not Your Gut
Everyone asks me the same question. What budget should I start with on Google Ads?
There isn’t a number. There’s arithmetic, and you already have the inputs.
Here is the part nobody tells you. Google will let you switch on Target CPA today with zero conversion history. Its own documentation says so: “Advertisers can start using Target CPA with no conversion history.” Being allowed to turn it on is not the same as it working.
Ask Google what it takes for the bidding to be worth trusting and you get a different number. For evaluating whether a strategy is actually performing, Google recommends at least 30 conversions in the last 30 days. And in its own bidding guidance it is blunter still: under 30 conversions a month, expect performance to swing by up to 100%.
Up to 100%. That’s the cost of being under-fed. Your CPA can double and none of it means anything, because there was never enough data to read.
So your starting budget isn’t a preference. It’s whatever spend gets you to 30 conversions inside a window you can live with.
Do the math on your own cost per lead
Two accounts, both spending $100 a day, completely different answers.
A $10 cost per conversion. You’re buying 10 a day. You hit 30 in three days. Bidding has what it needs before the end of the week and you should already be scaling.
A $100 cost per lead. You’re buying one a day. It takes a full month to reach 30, and for that entire month you can’t tell a real result from noise. Push to $200 a day and you’re buying two a day, so you clear 30 in 15 days. You cut the blind period in half by spending more, not less.
That’s the part most people have backwards. Underfunding doesn’t reduce your risk. It stretches out the window where nothing the account tells you can be trusted.
Run your own number:
Your cost per conversion | At $100/day | At $200/day | At $300/day |
|---|---|---|---|
$10 | 3 days | 2 days | 1 day |
$25 | 8 days | 4 days | 3 days |
$50 | 15 days | 8 days | 5 days |
$100 | 30 days | 15 days | 10 days |
$200 | 60 days | 30 days | 20 days |
Find your row. That’s how long you’re paying for a campaign you can’t read yet. Pick the column you can stomach.
If your leads cost $100, buy cheaper conversions first
Some businesses can’t get there honestly. A $200 lead at a budget you can actually afford means two months before you know anything, and nobody has that kind of patience.
So stop buying the expensive conversion first. Buy a cheap one.
A lead magnet converts at a fraction of what an appointment costs, because it’s free or nearly free to the person taking it. A guide, a checklist, a calculator, a pricing tool. Your cost per conversion on that might be $8 instead of $200. Suddenly 30 conversions is a few days of spend instead of two months.
Google doesn’t care that the conversion was a download. It’s learning who responds to you. Once the volume is there and the cost per lead has settled, you point the machine at the appointment, and it already knows the shape of your buyer.
One caution: the lead magnet has to sit next to the thing you sell. A roofing inspection checklist trains the model on roofing buyers. A $10 Amazon gift card trains it on people who want gift cards, and you’ll have bought 30 conversions worth of nothing.
Then stair-step it. 20% at a time.
Once bidding is on and your CPA is where you want it, you scale. Not by doubling. By 20%.
That’s our rule, not Google’s. Google publishes nothing about how big a budget change should be. What we see in accounts is that a big jump throws the campaign back into learning and you eat a stretch of bad efficiency you never had to eat.
The loop:
Raise the budget 20%. Leave the Target CPA where it is.
Expect a few days of volatility. It stays small because the move was small.
Wait for CPA to settle back to where it was.
Raise it 20% again.
Repeat and you climb. Skip steps and you spend a month in learning at a cost per lead that makes you want to shut the whole thing off.
You do have to be okay with not being efficient for a little while. That’s the price of finding out. Anyone promising you efficiency from day one is describing an account that isn’t growing.
None of this helps if the offer isn’t proven
If you’ve never run ads and nothing is currently selling online, budget is not your problem.
Ads don’t work out of the box. They amplify an offer that already works. If nobody is coming to you from the internet today, and you don’t have something a stranger responds to, the first job is finding that. Alex Hormozi’s Grand Slam Offer framework is a reasonable place to start. So is getting one thing to sell and then putting money behind it.
Test the waters. Find what works. Then scale it.
What you can’t do is hand Google $1,500 a month and hope your business grows. That’s not a strategy. That’s a subscription.
Do this today
Take your cost per conversion. Multiply it by 30. Divide by the number of days you’re willing to wait before the numbers mean anything.
That’s your budget. If the number is bigger than you expected, your options are to wait longer or to buy a cheaper conversion first. Those are the only two.
Want somebody to check your math against the actual account? I’ll read it and send back what I find in writing, with the dates and the numbers. Request an account read.
