Amazon charges fees automatically — and makes measurement errors constantly. Most sellers never check. This guide explains where overcharges happen, how to find them in your reports, and how to recover the money without a monthly subscription.
Find My OverchargesSuspect Amazon is overcharging your FBA fulfillment fees? Check any single item in seconds — enter what Amazon charged you and see the correct fee. Free and 100% offline.
100% offline. Your inputs never leave your device. Fulfillment fees only — storage, referral and other fees are not checked here. Reconcile with your current Seller Central fee before disputing.
Need to audit your whole catalog at once and get ready-to-send dispute letters? Get the full FBA Fee Auditor →
Amazon uses Cubiscan machines to measure products in their fulfillment centers. A measurement error of even a fraction of an inch can push your product into a more expensive size tier — and it applies to every single order until you catch it and dispute it.
Applies to every unit shippedMonthly storage fees are calculated based on cubic footage or cubic meters. If Amazon has incorrect dimensions on file, your storage charge is wrong every single month — and compounds silently across your entire catalog.
Compounds monthlyIf Amazon assigns your product to the wrong category, you pay the wrong referral fee percentage. Electronics at 8% vs Toys at 15% is a 7-point difference — on every sale. Most sellers never check their category assignment.
On every sale, every dayIn Seller Central, go to Reports → Fulfillment → FBA Fee Preview Report. Download as CSV. This file contains every ASIN, its recorded dimensions, size tier, and the exact fees Amazon is charging per unit.
Compare each row in the report to Amazon's current fee table for your marketplace. Look for products where the size tier in the report doesn't match what the product's actual dimensions should qualify for. Even a $0.50 difference per unit matters at volume.
Download the Monthly Storage Fees Report. Multiply your recorded cubic footage by the current storage rate for your marketplace and compare against what Amazon actually charged. Any difference above $0.02 is a real overcharge worth disputing.
Open a case in Seller Central with the ASIN, the fee Amazon charged, what the correct fee should have been, and the total difference. Amazon requires you to provide all of this information — they won't hunt through their own system for you.
FBA Fee Auditor checks every row in your reports automatically — offline, no subscription, no cloud.
Four free tools, one job: catch and recover the FBA fees Amazon got wrong. Start anywhere — they all point back to the full auditor.
Disclaimer: FBA Fee Auditor is an independent tool created by Smart Local Tools. It is not affiliated with, endorsed by, or in any way officially connected to Amazon.com, Inc. or any of its subsidiaries. Amazon, Fulfillment by Amazon (FBA), and Seller Central are trademarks of Amazon.com, Inc.
The fee tables included in this tool are based on publicly available information from Amazon Seller Central and reflect rates as of January 15, 2026 (US) and February 1, 2026 (DE). Fee structures may change at any time. Smart Local Tools makes no guarantee that the fee tables are complete, current, or error-free. Always verify results against the official Amazon Seller Central fee schedule before filing a reimbursement case.
This tool is provided "as is" without warranty of any kind. Smart Local Tools is not liable for any financial decisions made based on the output of this tool. Use of this tool constitutes acceptance of these terms.