Free FBA Tool Knowledge Base & FAQ
Everything you need to know about Amazon 2026 FBA Fees, Size Tiers, and using our calculator efficiently.
Q.How accurate are the 2026 FBA fees?
Extremely accurate. Our calculator implements the confirmed 2026 Amazon FBA logic, including the new 'Extra Large' OR-condition detection and the strict 2-inch minimum width/height rule for dimensional weight calculations.
Q.What is 'Smart Paste' and how do I use it?
Smart Paste is an AI-powered feature that parses text from supplier chats. Simply copy a line like 'Box 15x30x15cm 1.5kg' and paste it into the Smart Paste tab. We automatically extract and convert dimensions and weights.
Q.Does the calculator check both dimensions and unit weight?
Yes. It validates Amazon 2026 size-tier thresholds using both dimension rules and unit-weight rules, and flags oversize edge cases involved in strict dimensional weight calculations.
Q.Can I calculate fees for multiple products at once?
Yes! Use the 'Batch Upload' tab to upload an Excel file. We process thousands of rows instantly, providing a downloadable report with Size Tiers, FBA Fees, and Shipping Weights for your entire catalog.
Q.What is the 'Low-Price FBA' program?
Items priced under $10 qualify for Low-Price FBA rates. Our calculator automatically detects this based on your 'Selling Price' input, or you can manually toggle it to see the fee difference.
Q.Why is my 'Shipping Weight' higher than my actual weight?
Amazon uses 'Dimensional Weight' for most tiers if the package is light but bulky. If (Length x Width x Height)/139 exceeds your actual weight, you are charged based on the volume. We highlight this difference in orange.
Q.How do I estimate Head Haul (Shipping to Amazon) costs?
You can enable 'Calculate Head Haul' and enter your freight forwarder's rate (e.g., $1.5/kg). We calculate the total shipping cost based on the billable weight of your shipment.
Q.Is my data private?
Yes. All calculations are performed efficiently in your browser session. We do not store your product data permanently; it clears when you refresh.
Q.Do I need to convert centimeters to inches manually?
No. You can select 'cm' or 'inch' in the dropdown, or just paste '20cm' in Smart Paste. We handle all unit conversions internally to match Amazon's Imperial standards.
Q.How does the 'Extra Large' tier work in 2026?
The 2026 definition is stricter. An item is Extra Large if Longest side > 59", OR Median side > 33", OR Shortest > 33", OR Girth > 130". We apply these checks automatically.
Still have questions?
We are constantly updating our logic to match Amazon's latest 2026 policies. If you spot an edge case, let us know.
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