Quick brief
What to know before you calculate
A short read on the assumptions, trade-offs and definitions that shape the answer.
- ROAS is revenue divided by ad spend, not profit.
- Break-even ROAS rises when gross margin falls.
- Customer lifetime value can justify acquisition cost only when retention and margin assumptions are realistic.
ROAS ignores margin by default
A 4x ROAS means four pounds of attributed revenue for each pound of ad spend. It does not mean four pounds of profit. Product cost, fulfilment, discounts, payment fees and returns all reduce what is left.
Break-even depends on gross margin
If gross margin is 50%, the campaign needs about 2x ROAS before ad spend is covered by gross profit. If margin is 25%, it needs about 4x. Lower-margin products need a higher revenue multiple to break even.
Extra costs can change the answer
Creative production, agency fees, tools, samples, shipping subsidies and promotional discounts can all sit outside the ad platform spend. Add them to the campaign view when deciding whether a campaign is truly profitable.
Use lifetime value carefully
Repeat purchasing can make a lower first-order ROAS acceptable, but only if retention is real. Use conservative repeat purchase, lifespan and margin assumptions before increasing acquisition spend based on future value.
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