How to tell if your ad spend is actually working
Ask a business owner how their ads are going and you'll usually hear platform numbers: impressions, clicks, maybe a cost per click. Ask them what a new customer from those ads costs, and the room goes quiet. That silence is the whole problem — because that second number is the only one that decides whether the spend is working.
The platforms report what they can see, and they can see clicks. But a click is not a lead, a lead is not a customer, and a campaign can look brilliant at the top of that chain while quietly losing money at the bottom of it.
The number that matters is simple to say: what does the ad account spend to produce one new customer, and what is that customer worth to you? If the second number is comfortably bigger than the first, the ads are working. If you can't answer either, the ads are unaccountable — which is not the same as failing, but is the same as flying blind.
Why you might not have the number
Almost always, it's tracking. The ad platform can't count enquiries it never hears about — form submissions that fire no event, phone calls with no tracked number, quotes that arrive by email. Until conversions are wired up, the platform optimises for the only thing it can measure: clicks. So it dutifully finds you the cheapest clickers on the internet, whether or not they buy anything.
The fix is unglamorous and pays for itself many times over: track every enquiry path — forms, calls, emails — back to the campaign that produced it. One afternoon of setup turns the ad account from a slot machine into a ledger.
Then judge it like an investment
With tracking in place, the review becomes almost boring. Cost per lead, by campaign. Leads that became customers, by campaign. Kill what doesn't earn, feed what does. No dashboards full of engagement metrics — just the same question every month: what did a customer cost, and what were they worth?
Clicks are what the platform sells you. Customers are what you were trying to buy.
If you're running ads right now and can't say what a customer costs from them, pause the budget increase you were considering and spend the week on tracking instead. It is the highest-return work in paid advertising, and nobody sells it to you because it isn't shiny. Once the number exists, every other decision gets easier.