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.
The products climbing Amazon fastest, measured from real BSR movement and sent every Monday. Free, unsubscribe any time.