Free CalcCommerce seller tool

Amazon Break-Even ACOS Calculator

Enter your real per-unit economics to estimate break-even ACOS, break-even ROAS and a target ACOS that leaves the profit you want after advertising.

Your product economics

Use the sales value that your ACOS denominator is based on.
Product, packaging, freight/duty allocation, etc.
Use the actual per-unit fee where possible.
Set to £0 to make target ACOS equal break-even ACOS.

Calculated limits

Net revenue before unit costs
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Pre-ad contribution profit
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Break-even ACOS
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Break-even ROAS
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Max ad spend to keep desired profit
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Target ACOS for desired profit
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What is break-even ACOS?

Amazon ACOS is ad spend divided by attributed ad sales. Break-even ACOS estimates the maximum ACOS at which advertising cost would consume the contribution available before advertising.

Break-even ACOS = pre-ad contribution profit ÷ selling price × 100

Why target ACOS should usually be lower

Break-even means approximately no contribution profit remains after advertising. If you want profit after ads, your working target ACOS normally needs to sit below break-even.

Use real cost data

Use actual landed cost and current Amazon fees wherever possible. Recalculate whenever price, fees, VAT treatment or sourcing costs change.

Want the spreadsheet version?

The CalcCommerce Amazon FBA Profit Calculator - UK adds reusable price scenarios and seller calculations, while the Complete Amazon Seller Toolkit combines profit, PPC, inventory and product-research tools.

Independent seller planning tool. CalcCommerce is not affiliated with or endorsed by Amazon. Outputs depend on the figures entered and are estimates for business planning, not accounting, tax, legal or financial advice. Verify current marketplace fees and tax treatment before acting.