How to know if your advertising pays off

When someone wants to know whether their advertising pays off, they almost always ask how many customers the ads brought in this month. It is a fair question, but it misses what matters: a customer who arrives through an ad can cost you more than they leave you.

The useful question is a different one: how much money is left in your till after paying for the ads and serving the customers they brought. If the answer is above zero, the advertising pays back. If it is zero or less, it is just moving money around, however many new customers you see.

It sounds like the same thing, and it is not. Here you will see why the two get mixed up so often, how to do the sum with three numbers and what to check if it does not add up.

Why advertising can look profitable when it is not

The first reason is looking at what you charge instead of what is really left. If a customer pays and the ad that brought them cost less than they paid, everything looks fine, but that payment also has to cover the materials, the hours and the cost of serving them. What you compare with the cost of the ad is what is left afterwards, the margin.

The second reason is giving the ad credit for customers who would have come anyway. Someone who already knew you, who walks past your door every day or who comes on a recommendation may tap an ad before calling, and the platform's dashboard will count them for the campaign. That is why the dashboard is almost always more optimistic than your till.

The third is looking at a single month. In some businesses a new customer barely leaves a margin the first time and leaves it on later visits; in others they buy once and never come back. Without knowing which one you are, any conclusion about one month is a guess.

How to know whether your advertising pays off with three numbers

You do not need any special tool, or to know anything about the ad platform. Three figures are enough, and any business can get them in an afternoon, even with a notebook:

1. What an average sale leaves you, after taking away what it costs you to make it.
2. What you paid for ads over the period you are looking at, for example a month.
3. How many new customers in that period came through the ads, asking each of them rather than relying only on the dashboard.

With that, the sum is a subtraction. Multiply the customers the ads brought by what each sale leaves and take away what you paid for the ads: what is left is what the advertising really contributed.

The third figure is the hardest to get, and the one that changes the result the most. The most reliable way to have it is to ask every new customer how they found you, at the moment they arrive, and note it wherever you note the booking or the order. It feels like a chore at first, and within a few weeks you have a figure no dashboard can give you.

Let's use some example numbers. If you spend 200 euros on ads in a month, 5 new customers come through them and each sale leaves you 50 euros, the ads generated 250 euros of margin and cost you 200, so they paid back 50. If each sale left you 30 euros, they would have generated 150 and the advertising would have cost you money, even though the dashboard showed exactly the same 5 customers.

If your customers usually come back, do the same sum with what they leave you over a year, not just on the first purchase. That difference is what separates closing a campaign that worked from keeping one that did not.

What to check if your advertising sum does not add up

A negative result does not mean advertising cannot work for your business. It almost always means something before or after the ad is letting customers slip away, and it is worth looking for it in order, from the cheapest thing to fix to the most expensive.

First, what happens after the click. If people ask and nobody answers them the same day, or if the page promises something different from the ad, the problem is not the campaign. Second, the offer, because an ad only spreads what you offer, and if the offer does not convince, spending more only multiplies the questions with no sale.

Third, and only then, the ad itself: who sees it, what image it uses and how much is spent. While you check the rest, you can lower the budget instead of switching it off, so you keep getting data without losing more money.

When you change something, change one thing at a time and let a few weeks pass before doing the sum again. If you touch the page, the offer and the ad all at once and the result improves, you will not know which of the three did it, and next time you will not know what to repeat.

Doing this sum once a month changes the conversation: you stop wondering whether the ads work and start knowing how much they pay back. And if you would rather do it the first time with someone, with your numbers in front of you, that is what the diagnostic session is for: half an hour, free of charge.