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0%ROAS alone does not tell you whether a Meta campaign is profitable. A 2x ROAS can be excellent for a high-margin product and unsustainable for a product with expensive fulfillment.
The correct starting point is the amount of money left from one order before advertising.
Start with contribution margin
First estimate net revenue after refunds:
Net revenue = Average order value × (1 − refund rate)
Then subtract the costs that change when an order is placed:
Contribution margin = Net revenue − variable costs
Variable costs commonly include COGS, shipping, fulfillment, and payment fees. Do not add an industry benchmark if you know your actual cost.
Turn margin into acquisition targets
Contribution margin is your break-even CPA. If an order contributes 42 before advertising, spending 42 to acquire it leaves no profit.
To preserve a desired profit per order:
Target CPA = Contribution margin − desired profit
Break-even ROAS and target ROAS follow from those CPA limits:
ROAS target = Average order value ÷ CPA limit
You can run the complete calculation in the free Meta Ads Profit & Break-even Calculator. It keeps the existing ROAS calculator URL and performs the calculation in your browser.
Connect the target to CPC
If the website converts 2% of paid clicks and the target CPA is 30:
Maximum CPC = 30 × 0.02 = 0.60
This does not mean every click above 0.60 is bad. Attribution, repeat purchases, and conversion-rate differences matter. It gives you a coherent unit-economics boundary for planning and diagnosis.
Watch for impossible targets
If desired profit equals or exceeds contribution margin, no acquisition budget remains. The answer is not a more aggressive ROAS target. One of the underlying economics must change: price, refund rate, product cost, fulfillment cost, conversion rate, or required profit.
Use the target as a constraint for creative and campaign decisions, then compare it with actual CPA and ROAS over one consistent reporting period.
