Amazon FBA Profit Calculator accuracy and testing

Formula source

• Profit = selling price - product cost - referral fee - fulfillment fee - inbound shipping - storage - ad cost - return allowance.

Test cases

Known limitations

• This page documents the checked-in calculator logic and does not certify results for every real-world edge case.
• Use the result as a planning estimate unless the calculator page states a stricter purpose.

Assumptions

• Rates are user-entered planning assumptions.
• The estimate does not replace accounting, tax, payroll, legal, or marketplace-specific guidance.
• Inputs are processed locally in the browser.

Unit handling

• Marketplace Fee Preset accepts one of the configured options.
• Selling Price accepts values in $.
• Product Cost accepts values in $.
• Referral Fee accepts values in %.
• FBA / Fulfillment Fee accepts values in $.
• Inbound Shipping accepts values in $.
• Storage Cost accepts values in $.
• Ad Cost per Sale accepts values in $.
• Return Allowance accepts values in %.
• Profit per Unit is displayed as currency.
• Profit Margin is displayed as a percentage.
• ROI on Product Cost is displayed as a percentage.
• Total Fees and Costs is displayed as currency.

Rounding rules

• Number displays use up to 2 decimal places in the calculator UI.
• Currency outputs are displayed with standard US dollar formatting.
• Percent outputs are displayed with two decimal places.
• Input precision follows configured step values where provided.

Version history

Change log