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How to Calculate ROAS (And the Break-Even You Need)

ROAS is the first number most sellers look at and the one most often misread. This guide gives the formula, shows how margin sets the break-even line, and works through an example where a healthy-looking ROAS is actually a loss.

Quick answer: ROAS = revenue ÷ ad spend. Spending $1,200 to make $4,800 is a 4× ROAS (25% ACoS). Your break-even ROAS is 100 ÷ gross margin %, so at 35% margin you need 2.86× to break even — and everything below that line loses money on every order.

The formula and what it means

ROAS divides the revenue attributed to advertising by the spend that produced it. A 4× ROAS means every $1 of ad spend returned $4 of revenue. It is a revenue ratio, not a profit ratio: nothing in it knows what the product cost. ACoS is the same relationship inverted (spend ÷ revenue, as a percentage), and platform dashboards often show one or the other, which is why sellers comparing notes sometimes argue about identical campaigns.

Finding your break-even ROAS

Break-even ROAS = 100 ÷ gross margin %. The gross margin here is the margin before advertising: revenue minus product cost, shipping, packaging and fees. At 25% margin you need 4×; at 35%, 2.86×; at 50%, 2×; at 60%, 1.67×. Anything under the line means ad spend exceeds the gross profit it generated — the campaign is being funded from somewhere else.

A worked example

$1,200 of spend produces $4,800 of revenue at a 35% gross margin. Gross profit is $1,680; after the ad spend you keep $480. That is a 4× ROAS, a 25% ACoS, a 10% net margin on revenue and a 40% return on ad spend. Now change the margin to 20%: gross profit is $960, and after ads you are $240 down. Identical ROAS, opposite outcome — the margin did all the work.

Blended versus platform ROAS

Platform ROAS counts only attributed conversions, so it answers 'does this channel work'. Blended ROAS uses total revenue over total ad spend, across all channels, and answers 'is the business working'. Track both: optimising to platform ROAS alone can quietly shrink organic revenue while the paid numbers look great.

Setting a target above break-even

Break-even only covers advertising. You still have overhead, returns and profit to fund, so a working target is typically 20–50% above the break-even figure: a 2.86× break-even supports a 3.5–4× target. When a channel can be scaled at that number, pour budget in gradually and watch for CPA drift as you leave your best audiences.

Four ways to raise ROAS without changing bids

Margin is the lever with the most leverage, but not the only one:

  • Raise average order value with bundles or free-shipping thresholds — same spend, more revenue
  • Cut product cost through sourcing or packaging, which lifts margin and lowers break-even ROAS
  • Improve conversion rate on the landing page, which spreads the same click cost over more orders
  • Upgrade the creative to attract higher-intent traffic, which usually lifts both conversion and AOV

Frequently Asked Questions

Is a 2× ROAS good?
It is good only if your gross margin exceeds 50%. At 40% margin a 2× ROAS loses money; at 60% it is comfortably profitable. Judge ROAS against your own break-even, never against a benchmark.
How is ROAS different from ROI?
ROAS compares revenue to ad spend. ROI compares profit to the total money invested. ROAS ignores costs, ROI includes them, so ROI is the more honest number and ROAS the faster one.
Should I include shipping revenue in ROAS?
Use the revenue the platform reports so figures stay comparable, then account for shipping costs in the margin you feed into the break-even calculation.
What ROAS should a new campaign target?
Start at break-even plus 20% to prove the economics, then optimise upward. Launching with an aspirational target above what the product supports is the fastest way to conclude, wrongly, that paid traffic does not work.

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