A 3x return on ad spend sounds like a good result. Spend $100, bring in $300, and the campaign looks healthy. The Ecom Profit Calculator project and community offers a starting point for looking beyond that headline number and discussing what remains after costs.
But how much of that $300 is left?
The answer depends on what you sell, what it costs to deliver, and how much you spend handling each order. Two stores can report the same ROAS and end the month with very different results.
Before deciding whether an ad is working, it helps to know the return your own store needs.
Start With What You Keep From Each Order
Imagine you sell a product for $50. For this example, assume that is the amount you receive before expenses, excluding any tax collected for the authorities.
The product costs $15. Shipping adds $7, while payment processing and handling come to another $3.
That leaves:
$50 − $15 − $7 − $3 = $25 before advertising.
You can spend up to $25 to acquire the order before its contribution falls to zero. At that point, there is nothing left from that order to cover subscriptions, salaries or other fixed expenses.
This is your break-even acquisition cost for the costs included in the example. It is a useful limit, but it is hardly a comfortable target.
Turn That Number Into a Break-Even ROAS
ROAS is the revenue attributed to advertising divided by the advertising spend.
Using the same example, a $50 order acquired for $25 produces a ROAS of 2:
$50 ÷ $25 = 2x ROAS.
At 2x, the order covers the product, shipping, processing, handling and advertising. It contributes nothing toward fixed costs or profit.
Now suppose another store sells a $50 product but spends $35 fulfilling each order before ads. It has only $15 available for customer acquisition.
Its break-even ROAS is roughly 3.33x.
For that store, a 3x campaign would lose money on each order under these assumptions. For the first store, it would leave a positive contribution. The dashboard number is identical. The economics are different.
Set a Target That Leaves Something Behind
Go back to the first product, with $25 remaining before advertising.
If you want each order to leave $10 toward overhead and profit, your maximum acquisition cost becomes $15:
$25 − $10 = $15 available for advertising.
Your target ROAS would therefore be about 3.33x:
$50 ÷ $15 ≈ 3.33.
That gives you a target based on your costs and the contribution you want to retain. You can then judge campaign results against it instead of borrowing a benchmark from another seller.
Test What Happens When Costs Change
Your target will move if your costs change.
A discount reduces the revenue you keep. A more expensive shipping route reduces the amount available for advertising. Refunds and replacements can eat into a margin that looked comfortable at checkout.
Run a few versions of your calculation. What happens if shipping costs $2 more? What if you lower the selling price by 10%? How much can acquisition costs rise before the order stops contributing?
Keep a separate allowance for expenses that your calculation does not include.
Check the Margin Before Increasing the Budget
More orders are easier to celebrate than a few dollars of contribution per sale. But those few dollars determine whether growth helps pay the bills.
Work out your costs, calculate your break-even point, and choose a target that leaves room for overhead and profit. Then revisit it as actual orders, shipping charges and refunds come in.
A ROAS target becomes useful when you can explain exactly why your store needs it.
