Editorial Policy
At FBA Profit Calc, accuracy and transparency are our highest priorities. This policy outlines how we research, verify, and maintain the fee data and calculation logic that powers our tools.
Data Sources
All fee data used in our calculators is sourced directly from Amazon Seller Central's official fee schedule pages. We do not rely on third-party aggregators or user-submitted data. Primary sources include Amazon's "Selling on Amazon fee schedule," "FBA features, services, and fees," and "FBA fulfillment fee" documentation pages.
Verification Process
Our team verifies fee data against Amazon's published schedules at least once per quarter. When Amazon announces fee changes (typically via Seller Central announcements or the Amazon Seller blog), we cross-reference the new rates against multiple official sources before updating our calculators. All updates are logged in our public changelog with timestamps and source references.
Formula Transparency
Every calculation formula used in our tools is documented and available for independent verification. We show our work — from how we determine size tiers to how we calculate each fee component. If you find a discrepancy between our calculations and Amazon's actual charges, we encourage you to contact us so we can investigate and correct any errors.
Update Policy
When Amazon announces fee changes, we commit to updating our calculators within 48 hours of the official announcement. All changes are documented in our changelog with the effective date, what changed, and links to the source announcement. We clearly display the "last updated" date on every calculator page.
Independence
FBA Profit Calc operates independently and is not affiliated with Amazon. Our revenue comes from display advertising, which does not influence our fee calculations or editorial decisions. We do not accept payment from any party to alter our calculations or present biased information.
Corrections
If we discover an error in our calculations, we correct it immediately and note the correction in our changelog. We do not silently update data. Transparency about our mistakes is as important as accuracy in our calculations.