What is break-even ACoS?

Break-even ACoS is the percentage of revenue you can spend on Amazon advertising before the product stops being profitable. If your margin is 27%, you can spend up to 27% of revenue on ads before losing money.

Does the calculator include overhead?

It supports an optional per-unit overhead input to approximate returns, storage, or amortized costs. Leave it at 0 for a pure contribution margin view.

What referral fee should I use?

Most Amazon categories use 15%. Some accessories, jewelry, and media categories use different tiers — check Amazon Seller Central for your specific category.

Amazon FBA Calculator

Estimate true Amazon FBA profit in seconds. Enter your sale price, COGS, inbound shipping, FBA fulfillment fee, referral percent, and ad spend to see net profit, margin, and break-even ACoS — all updating live as you type. No signup.

How to read the results

Net profit is revenue minus Amazon referral fee, FBA fulfillment fee, COGS + inbound shipping, and any overhead you entered.
Margin is net ÷ revenue, as a percentage.
Break-even ACoS equals the margin — spend less than this % on PPC and you keep some profit; spend more and ads eat the product.

FBA calculator FAQ

What is break-even ACoS?: Break-even ACoS is the share of revenue you can spend on Amazon advertising before the product stops being profitable. If your margin is 27%, you can spend up to 27% of revenue on ads before losing money.
Does the calculator include overhead?: It supports an optional per-unit overhead input to approximate returns, storage, or amortized costs. Leave it at 0 for a pure contribution-margin view.
What referral fee should I use?: Most Amazon categories use 15%. Some accessories, jewelry, and media categories use different tiers — check Amazon Seller Central for your specific category.

Once the numbers work, trim your fixed costs: browse deals on Amazon seller tools, inventory management, and ecommerce software.