Free Amazon Storage Fee Calculator
Plug in your product dimensions and unit count to estimate monthly FBA storage fees — plus the brutal Q4 (Oct-Dec) bump and aged-inventory surcharges that catch new sellers off guard.
Three steps.
Zero friction.
- 01
Enter your product's length, width, and height in inches.
- 02
Set the unit count, size tier, and whether the calculation is for Q4 or Jan-Sep.
- 03
If any units have been at Amazon 271+ days, enter that — long-term storage fees stack on top.
Why Q4 storage fees triple — and how to plan for it
Amazon roughly 3x's storage fees from October through December to push sellers to keep inventory lean during peak season. If you ship 6 months of stock in September, your storage fee from Oct-Dec alone can eat your entire Q4 margin.
Long-term storage fees kick in at 271+ days and become brutal at 365+ days ($6.90 per cubic foot). Run this calculator before every restock to keep velocity-to-inventory ratios sane.
Frequently asked questions
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