Break-even ACoS
Break-even ACoS is the advertising cost of sale at which an ad-driven sale makes zero profit, equal to your profit margin before ad spend.
If a unit's price is $30 and your profit before advertising is $9, your break-even ACoS is 30%. Campaigns running below it make money on every attributed sale; campaigns above it pay for sales at a loss.
Sellers deliberately run above break-even during launches, buying rank and reviews with short-term loss, but that only works as a strategy if you know exactly where break-even sits and when you'll return below it.
Why it matters
Break-even ACoS converts your margin into a concrete bidding ceiling, turning PPC management from guesswork into a rule you can actually enforce.
Related terms
See Break-even ACoS on real products
LumaiScope turns metrics like this into a plain-English GO / WATCH / NO-GO verdict. Start free, no credit card.
Start freeOr see what each plan includes and the tools on the free plan.