Amazon Ads Calculator

Amazon Break-Even ACoS Calculator

Turn your product margin into practical Amazon PPC guardrails. Calculate break-even ACoS, target ACoS, ROAS thresholds, profit per ad-attributed order and optional CPC limits using your own product economics.

1

Enter your product economics

Use per-unit values for the product you are advertising. Amazon fees vary by marketplace, category, size, weight and fulfilment method, so use the actual values from Seller Central or your own profitability data.

For display only.
Use the actual selling price you expect after discounts.
Product cost plus landed costs you allocate per unit.
%
Enter the exact referral fee applicable to this product. Some fee structures are category- or price-dependent.
Use your FBA fulfilment cost or seller-fulfilled variable cost.
Prep, inbound placement allocation, storage allocation, packaging, closing fees or other variable costs.
%
Optional planning reserve as a percentage of selling price. This is not an Amazon fee.
2

Add your advertising guardrails

These fields are optional. Add the metrics you actually use to turn product margin into a target ACoS and CPC ceiling.

%
The profit margin you want to retain after advertising costs.
%
Orders ÷ ad clicks. Used to calculate economic CPC ceilings.
%
Use campaign, ad group, target or search-term ACoS to estimate profit per ad-attributed order.
Requires conversion rate. Used to estimate implied ACoS and minimum break-even CVR.

What is break-even ACoS?

ACoS, or advertising cost of sales, compares Amazon Ads spend with ad-attributed sales. Break-even ACoS is the share of revenue you can spend on advertising before your remaining per-unit contribution reaches zero. For a product with a 35% pre-ad contribution margin, the simplified break-even ACoS is also 35%.

Pre-ad contributionSelling Price − COGS − Amazon Fees − Fulfilment − Other Costs
Break-even ACoSPre-ad Contribution ÷ Selling Price × 100
Break-even ROASSelling Price ÷ Pre-ad Contribution
Target ACoS(Pre-ad Contribution − Desired Profit) ÷ Selling Price × 100
Economic max CPCAllowed Ad Spend per Order × Conversion Rate
Implied ACoS from CPCCPC ÷ (Selling Price × Conversion Rate) × 100

Why Amazon advertisers use both ACoS and product margin

A low ACoS is not automatically profitable, and a higher ACoS is not automatically bad. The useful ceiling depends on the economics of the specific ASIN or product being advertised. A launch campaign may accept a different efficiency target than a mature profitability-focused campaign.

Important:This calculator models unit economics for ad-attributed sales. It does not include every possible seller cost, tax treatment, organic sales impact, attribution effect, placement adjustment or business objective. The CPC outputs are economic guardrails, not guaranteed Amazon Ads bid recommendations.