Amazon Break-Even ACOS Calculator
The line above which advertising loses money.
Amazon revises fee schedules at least annually and adds new surcharges more often. These defaults are a starting point — the figures in your own fee preview are the ones that describe your ASINs.
Break-even ACOS
43.6%
33.6% to keep 10% profit
Break-even ACOS equals your margin before advertising — spend a penny more per sale and the sale costs you money. Every bid decision is really a decision about where you sit against 43.6%, and knowing the number is what separates bidding from guessing.
How the Amazon Break-Even ACOS Calculator works
Break-even ACOS equals your margin before advertising. Spend a penny more per sale than that and the sale costs you money. Every bid decision is really a decision about where you sit relative to that line — and most sellers do not know where the line is.
Not financial advice. Marketplace fees change, and they vary by country, plan and seller status. Every rate here is an editable default, not a quoted price — check the platform's current fee schedule before you price a product against it. This is not tax or business advice.
Frequently asked questions
How do I calculate break-even ACOS?
Contribution before advertising, divided by price. If a $30 item costs $20 in product and fees, contribution is $10 and break-even ACOS is 33%.
What is target ACOS?
Break-even less the profit you want to keep. On the same product, keeping 10% of price as profit means a target ACOS of 23% rather than 33%.
Should I ever exceed break-even?
Deliberately, yes — during launch to buy reviews and rank, or to defend a position against a competitor. The problem is exceeding it by accident and calling it a strategy afterwards.
How does price change it?
Raising price raises break-even ACOS twice over: contribution rises and the denominator rises with it. A modest price increase can transform which keywords are affordable.