Enter your price, product cost, and Amazon fees — get the ACOS at which an ad sale makes exactly zero profit, plus a sensible target.
Break-even ACOS = (price − COGS − fees) ÷ price × 100. It's your profit margin before ad spend. Run ads below it and ad sales add profit; above it, every ad-attributed sale loses money — no matter how good the ACOS looks compared to "industry benchmarks."
Most sellers set a target ACOS at 60–80% of break-even so ad sales contribute real profit, then knowingly exceed it only during launches (where the goal is organic rank, not immediate profit).
Full context in the break-even ACOS definition and the complete ACOS guide.
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