AMZ Prep FBA Calculator: Amazon Profit & Fees by AMZ Prep

Calculate Amazon FBA fees, net profit, margin, and ROI on Amazon product pages. Free, no account needed, 9 marketplaces supported, and every calculation runs locally in your browser.

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About this extension

FBA Calculator by AMZ Prep helps Amazon sellers see what a product will actually earn after Amazon fees. Open the calculator on an Amazon product page, add your costs, and get net profit, profit margin, and ROI in seconds.

It is free to use, requires no account or sign-up, and runs its calculations locally in Firefox.

What it calculates

FBA fulfillment fees based on the product's size tier
Amazon referral fees by product category
Monthly inventory storage fees
Net profit after Amazon fees and your own costs
Profit margin and return on investment (ROI)
Break-even selling price

Built for sourcing decisions

Reads product dimensions and weight from the Amazon product page to determine the size tier
Lets you add your own costs, such as product cost, prep fees, and inbound shipping
Exports results to CSV for spreadsheet analysis

Supported Amazon marketplaces

United States (amazon.com)
Canada (amazon.ca)
United Kingdom (amazon.co.uk)
Germany (amazon.de)
France (amazon.fr)
Italy (amazon.it)
Spain (amazon.es)
Japan (amazon.co.jp)
Australia (amazon.com.au)

Who it is for

New sellers checking whether a first product is profitable
Wholesale and online arbitrage sellers vetting deals quickly
Private label brands planning pricing and margins
Established FBA businesses running quick profitability checks while sourcing

How to use it

Open a product page on a supported Amazon marketplace
Click the FBA Calculator icon in the Firefox toolbar
Enter your product and shipping costs
Review net profit, margin, and ROI, and export to CSV if needed

Privacy

All calculations happen in your browser. The add-on does not collect, store on external servers, or transmit your searches, product data, or personal information.

Fee estimates are based on Amazon's published fee schedules. Always confirm final fees in Seller Central before making purchasing decisions.

About AMZ Prep

AMZ Prep is an Amazon FBA prep and 3PL fulfillment company. This add-on is not affiliated with, endorsed by, or sponsored by Amazon.
5. Screenshot Captions / Key Features
-Complete FBA fee breakdown: fulfillment, referral, and storage
-Net profit, profit margin, ROI, and break-even price
-Product dimensions and weight read from the listing
-Custom cost inputs for product, prep, and shipping
-CSV export
-Support for 9 Amazon marketplaces
-Free to use with no account required
-Local processing in your browser

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Permissions and data

Required permissions:

Access your data for sites in the amazon.com domain
Access your data for sites in the amazon.co.uk domain
Access your data for sites in the amazon.ca domain
Access your data for sites in the amazon.de domain
Access your data for sites in the amazon.fr domain
Access your data for sites in the amazon.it domain
Access your data for sites in the amazon.es domain
Access your data for sites in the amazon.co.jp domain
Access your data for sites in the amazon.in domain
Access your data for sites in the amazon.ae domain

Optional permissions:

Access your data for sites in the amazon.com domain
Access your data for sites in the amazon.co.uk domain
Access your data for sites in the amazon.ca domain
Access your data for sites in the amazon.de domain
Access your data for sites in the amazon.fr domain
Access your data for sites in the amazon.it domain
Access your data for sites in the amazon.es domain
Access your data for sites in the amazon.co.jp domain
Access your data for sites in the amazon.in domain
Access your data for sites in the amazon.ae domain

Data collection:

The developer says this extension doesn't require data collection.