Platform ROAS vs real profit: how to tell the difference

Every ad platform wants credit for the sale. Meta counts it, Google counts it, TikTok counts it. Add their reports together and most brands have sold more than they actually did. That gap is where budgets quietly leak.

Why the numbers disagree

Platforms use attribution windows that favour themselves. A customer who saw an ad seven days ago and then searched for your brand name is still claimed as a win. Nobody is lying, but the same order gets counted two or three times.

Return on ad spend also ignores everything after the click. Discounts, shipping, returns and the cost of the product itself never show up in the dashboard.

The three numbers we track instead

First, blended return: total revenue divided by total ad spend, from your own store data. Second, cost per new customer, so repeat buyers do not flatter the result. Third, contribution margin after ads, which tells you whether growth is actually making money.

A simple weekly check

Once a week, put the platform figure next to your store figure. If the platforms claim 30 percent more sales than you shipped, scale your targets down by the same amount. It takes ten minutes and it changes which campaigns survive.

When the numbers finally agree with your bank account, decisions get easier. You stop arguing about dashboards and start moving budget to what works.