The metric behind the dashboard
ROAS tells you revenue.
Profit takes more math.
Return on ad spend is useful. But a 4x ROAS can leave one business with money and another with a loss. Here’s how to tell the difference.
A practical guide to ROAS, break-even ROAS and contribution margin.
Same reported ROAS
3.0×
Revenue from ads€30,000
Ad spend€10,000
At 50% margin€5,000 left
At 25% margin€2,500 short
Same ROAS. Different business.
01 / The definition
What is ROAS?
ROAS stands for Return on Ad Spend. It compares the revenue attributed to advertising with the amount spent on advertising.
If you spend €10,000 on ads and those ads generate €40,000 in revenue, your ROAS is 4.0x, or 400%.
The formulaROAS = Revenue from ads ÷ Ad spend
Revenue efficiency is not profit. ROAS does not account for product cost, shipping, payment fees, returns, discounts or other variable costs.
02 / The real threshold
What is a good ROAS?
There is no universal “good” number. Your contribution margin determines where you break even and how much room advertising has.
Business A50% margin
Half the revenue remains before advertising. First-order break-even ROAS is roughly 2.0x.
Business B25% margin
One quarter remains before advertising. First-order break-even ROAS is roughly 4.0x.
At 3.0x ROAS, Business A has room after ads. Business B is below break-even. The visual above uses €30,000 revenue and €10,000 spend to show the difference.
03 / Break-even ROAS
Find your floor before setting a target.
Express contribution margin as a decimal after variable costs and before advertising. Then divide 1 by that margin.
At a 40% margin, 1 ÷ 0.40 = 2.5x. At that ROAS, first-order contribution is approximately consumed by ad spend.
Break-even ROAS1 ÷ Contribution margin
This is an acquisition view. Fixed overhead, taxes, repeat purchases, attribution and channel overlap can change the final business result.
04 / Read the right metric
ROAS versus profit
Each metric answers a different question. Keep the revenue metric and the business economics in view together.
| Metric | What it tells you | What it misses |
|---|---|---|
| ROAS | Revenue per euro of ad spend | Most non-ad costs |
| CPA / CAC | Cost to acquire an order or customer | How much that customer contributes |
| Contribution after ads | What remains after variable costs and acquisition | Fixed overhead and taxes |
| ROI | Return relative to a broader investment base | Depends on which costs are included |
05 / Beyond the platform
Why platform ROAS can mislead you
Meta Ads, Google Ads and other platforms report attributed revenue. That helps campaign optimization, but it is not accounting profit.
The better question is: after variable costs and advertising, how much is left from the next order?
That is the idea behind Ads Don’t Fix Weak Math: better advertising cannot repair economics that do not work.
Put these next to your ROAS
- Average order value
- Contribution margin after variable costs
- Cost per click and conversion rate
- Actual cost per order or customer
- Repeat contribution, if measured reliably
06 / A simple example
What stays after the order?
Take a store with €100 average order value and 50% contribution margin before advertising. Each order contributes €50 before acquisition cost.
Revenue per order€100
Contribution before ads€50
At €40 CPA / 2.5x ROAS€10 left
At €60 CPA / 1.67x ROAS€10 loss
Set your target backwards. Start with margin and the amount you want to keep after advertising. The target ROAS follows from those numbers, rather than an industry benchmark.
Put your numbers in
See the economics behind your ROAS.
AdsMath connects ad spend, traffic cost, conversion rate, average order value and contribution margin to show what your numbers leave behind.
Quick answers
ROAS FAQ
What does ROAS stand for?
Return on Ad Spend.
How do you calculate ROAS?
Divide revenue attributed to advertising by ad spend. €40,000 revenue ÷ €10,000 spend = 4.0x.
Is a 4x ROAS good?
It depends on your contribution margin and the amount you need left after ads. At 25% margin, 4x is only first-order break-even before fixed costs.
What is break-even ROAS?
The ROAS where order contribution is consumed by ad spend. A simplified first-order formula is 1 ÷ contribution margin.
Is ROAS the same as ROI?
No. ROAS compares attributed revenue with ad spend. ROI normally considers a broader set of costs and returns.
