"So ROAS is no use anymore?" We get asked this almost every week, usually right after explaining POAS to a client. The short answer is that yes, ROAS is still useful. The problem is not ROAS. The problem is using it to decide things it cannot answer.
The difference is simple: ROAS measures how much revenue each euro spent on advertising generates. POAS measures how much profit it generates. ROAS ignores your margin. POAS factors it in. That is why looking at ROAS alone is the reason so many brands invoice more each month and earn less.
The difference in one table
| ROAS | POAS | |
|---|---|---|
| What it measures | Revenue per euro invested | Gross profit per euro invested |
| Formula | Revenue / ad spend | Gross profit / ad spend |
| Takes margin into account | No | Yes |
| What it's for | Optimising campaigns day to day | Deciding whether to scale and whether you make money |
| Where you see it | In the platform, instantly | Needs your real margin data |
| Risk if you use it alone | Scaling campaigns that leave no profit | None: it's the real picture |
If you want the step-by-step POAS calculation with examples, it is in what POAS is and how to calculate it. Here we go to the point that matters: when to use each, and why confusing them gets expensive.
Why ROAS on its own can mislead you
ROAS treats every euro of revenue as if it were worth the same. And they are not worth the same, because each euro carries a different margin.
The clearest example shows up in every promotion. Say you sell a product at €100, with a product cost of €40. Without a discount, it leaves you €60 of margin.
Along comes a campaign with 25% off. Now that product sells at €75. But the cost is still €40. Your margin drops to €35.
What happens to your metrics? The promotion converts better, so your ROAS goes up: you make more revenue per euro spent. The report looks great. But your POAS goes down, because each sale leaves almost half the margin. ROAS applauds you while you give away profitability.
The same happens between products. A campaign selling high-margin items and one selling low-margin items can share the same ROAS and produce opposite results. ROAS does not tell them apart. POAS does.
So which one should I look at?
Both. But for different things.
Use ROAS for the day-to-day inside the platform: comparing ads, audiences and creative, seeing what works and what does not within hours. It is a quick, operational signal, and for that it is perfect.
Use POAS for the decisions that touch your P&L: how much budget you put in, which campaigns you scale, which you pause, which products you push. Anything that affects whether you make money is decided on POAS.
In one line: ROAS is for flying the plane day to day; POAS is for deciding where you fly it.
How we use both at STRAT
Day to day we watch ROAS, because optimising needs an immediate signal and the platform does not give you margin in real time. But no budget decision is made on ROAS alone. Before scaling a campaign, we run it through POAS with the client's real margin.
And when we report, we report on POAS connected to the P&L, not on the isolated metrics of each platform. A pretty ROAS in the Meta dashboard does not pay wages. Profit does.
Is POAS going to replace ROAS?
No. And anyone telling you otherwise is probably simplifying to sell you something. They are metrics answering different questions, and they complement each other. ROAS does not disappear; what changes is the weight you give it in the important decisions. To optimise, ROAS. To decide, POAS.
The mistake almost everyone makes
Making scaling decisions on ROAS alone. It is what leads people to raise the budget on a campaign that invoices a lot and leaves little, and to pause a campaign with a more modest ROAS that was actually the most profitable. Once you put margin into the equation, the ranking of your "best" campaigns sometimes flips completely.
Frequently asked questions
What is the difference between ROAS and POAS? ROAS measures the revenue each euro spent on advertising generates. POAS measures the gross profit each euro generates. The difference is that POAS accounts for your margin and ROAS does not.
Which is better, ROAS or POAS? It depends what for. ROAS is better for optimising campaigns day to day. POAS is better for deciding whether an investment is profitable and whether you can scale. For profitability decisions, POAS wins.
Can I use both at once? Yes, and it is the recommended approach. ROAS as the quick operational signal inside the platform, and POAS as the decision metric for budget and profitability.
Why is my ROAS going up but I am earning less? It usually happens with promotions and discounts. The discount lifts conversions (ROAS goes up) but reduces the margin on each sale (POAS goes down). You invoice more and earn less.
Does POAS replace ROAS? No. They answer different questions and coexist. ROAS is still useful for optimising; POAS is the one you use to decide.
A high ROAS does not confirm that a campaign leaves a profit. At STRAT we work out your real POAS from each product's margin, and we build that calculation into our paid media campaign management, to scale only what adds profitability and cut what destroys it.
