The opening eBook of the Paid Growth and Campaigns category. It assumes you've done the basic work on offer, website and search ranking, and shows you how to add paid ads as a controlled, measurable layer on top - without burning your first thousand pounds learning what a sensible test looks like.
Members ebook·7 chapters· 45 minute read
Chapter 3
Setting a Sensible Ad Budget
How much to spend, how to split it, what counts as a real test and the budget rule that protects you from the first-month wipeout.
There's a number that decides whether your first paid ads test teaches you anything useful or just costs you money. It isn't the click cost. It isn't the daily budget. It's the total amount you're willing to spend before you decide. Most small business owners pick a daily budget without picking a total, and then panic and switch the campaign off when the spend reaches a number that feels uncomfortable. That uncomfortable moment usually arrives before the campaign has gathered enough data to be readable. The owner concludes that ads don't work. In fact, the test never finished.
The fix is to flip the order. Decide the total first. Pick a number you can afford to lose entirely if the test fails. Divide that across enough weeks to give the platform time to learn. Then resist every urge to change anything until the total has been spent. That's a real test. Anything shorter is a guess.
This chapter gives you the budget framework we use with small businesses for their first paid ads test, the rule that prevents the first-month wipeout and the maths that tells you whether your offer can support paid clicks at all.
The full chapter walks through the test-budget rule, the maths that decides whether your offer can carry paid traffic, the split between testing and scaling and the budget shape we'd recommend for nine different small business sizes.
The test-budget rule
A real first paid ads test on Google Ads or Facebook and Instagram needs at least three hundred pounds of total spend over six to eight weeks on a single channel. Below that, the platform doesn't gather enough conversion data to optimise, and you don't gather enough customer data to decide. Above that, you're scaling a test rather than running one, and the rules change. Three hundred pounds is the floor. Six hundred pounds gives you a more confident answer. A thousand pounds, spent over the same period, is genuinely enough to know.
The structure matters more than the exact number. Pick the total. Divide it across the weeks. Run the campaign at that daily rate without changing the budget mid-test. At the end of the test period, you'll either have a positive result you can scale, a clearly negative result you can stop or a borderline result you can rerun with one specific change. All three outcomes are worth the money. The fourth outcome - a test you switched off after eight days because you got nervous - is the only one that wasn't.
The maths that decides whether your offer can carry paid clicks
Before you set a budget, work out the most you can afford to spend per customer and still come out ahead. Take your average sale, work out your gross profit on it (the bit left after the direct costs of delivering the work), then take a fraction of that gross profit as the most you'd pay to acquire one customer. For a small business, that fraction is typically twenty to forty per cent. Anything more and you're working for the ad platform, not for yourself.
Then work backwards. If your offer is a hundred and twenty pound per month bookkeeping retainer with an average customer life of fourteen months, your customer is worth about one thousand six hundred and eighty pounds in revenue, perhaps eight hundred pounds in gross profit. Forty per cent of that is three hundred and twenty pounds. That's the most you can spend per customer acquired. If your campaign delivers an enquiry every twenty pounds and one in eight enquiries becomes a customer, your cost per customer is about a hundred and sixty pounds. The maths works. If your campaign delivers enquiries at fifty pounds and one in twenty becomes a customer, your cost per customer is a thousand pounds. The maths doesn't work, and no amount of clever creative will fix that gap.
Three numbers to write down before you spend
Average sale value (or average twelve-month revenue per customer for repeat businesses)
Gross profit on that sale (revenue minus the direct cost of delivering it)
Maximum cost per customer (twenty to forty per cent of gross profit)
Test budget, scale budget
Treat your first six to eight weeks as a test budget. The job is to learn, not to grow. Spend the floor amount, leave the campaign alone, watch the numbers and decide. Once you have a result that says yes, you switch into scale mode. In scale mode the budget grows in steps of twenty to thirty per cent at a time, with a two-week pause between each step to let the platform re-stabilise. Doubling the budget overnight almost always increases the cost per customer for a few weeks, and many small business owners panic and drop it back, which then trains the platform to spend even less efficiently. Scale slowly. The compounding is in the patience.
What to spend if you only have a hundred pounds a month
If a hundred pounds a month is genuinely all you can spare, paid ads probably aren't your channel for the next quarter. That budget is below the floor for a real test on any of the major platforms. Better uses of the same hundred pounds a month: buying a few extra customer reviews by paying for a small thank-you scheme, sending a print mailer to your top fifty past customers, running a targeted email campaign through your existing customer list, or paying to attend one industry event. Each of those typically returns more than a sub-floor ad campaign on the same money.
Save up. Once you can put three hundred pounds against a single test inside two months, start there. There's no rush. The earlier eBook Low-Cost Marketing Ideas covers what to do with the gap month while you save.
What to spend if you have a thousand pounds a month
A thousand pounds a month is comfortable test territory for a single small business. Spend the first month at three hundred pounds running a small first test on the channel you picked in chapter two. If the test works, scale to six hundred in month two and a thousand in month three, then hold there for a quarter to let the campaign stabilise. If the first test fails clearly, regroup, fix the obvious problem (usually the landing page or the offer) and run a second three hundred pound test before increasing.
Don't open three platforms at once just because the budget allows it. Add a second platform only after the first one is steady at a known cost per customer. Two channels, each with a real test, beats four channels, each with a half-test.
Protect yourself from the first-month wipeout
Three platform-level controls prevent most of the horror stories. Set a daily budget cap inside the platform itself, even if you've also set a campaign budget. Set a separate monthly cap on the bank card or virtual card you fund the account with. Switch off automatic budget increase suggestions in the platform settings - the platform will offer to spend more on your behalf, and the offers always sound reasonable in the moment. Each of these takes two minutes and has saved more than one small business from a four-figure surprise.
What to do this week
Write down your three numbers - average sale, gross profit, maximum cost per customer. Then write your test budget for the next eight weeks: total amount, weekly amount and the date you'll review it. Set the matching daily and monthly caps inside the ad platform and on the funding card. Block out a thirty-minute slot in your calendar exactly eight weeks from today as the first review meeting with yourself. Don't open the campaign before then unless something is on fire.
In the next chapter we cover the actual ads - copy, creative, the hooks that earn the click on a small budget and the patterns that quietly waste money. The companion eBook Facebook and Instagram Ads for Small Businesses then goes deeper on creative for the discovery channels.
The rest of this chapter walks through the practical steps, the templates and the checklists you need to put it into action. It includes worked examples, copy frameworks and the small decisions that make the difference between a plan that sits in a drive and one that gets used.
Inside you'll find a step-by-step playbook, a downloadable template, a checklist you can run this week and a short list of common mistakes to avoid before you start.
The full action plan, broken into weekly steps.
Ready-to-use scripts, templates and checklists.
Worked examples for different sized businesses.
Common mistakes and how to avoid them.
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