2026 Amazon FBA Storage Fee Solver: Estimate monthly warehouse inventory storage fees based on size category, volume (cubic feet or package dimensions), dangerous goods status, and seasonal Q4 rate changes.
Storage Classification & Season
Inventory Volume & Quantity
units
cu ft
Average packaged unit volume in cubic feet
Total Cubic Volume
(100 units × 0.250 cu ft)
25.00 cu ft
Verify before you act:Amazon FBA & referral fees reflect 2026 fee updates. Verify final numbers in Seller Central.
Monthly Storage Fee OutputBase Season Rate
Monthly FBA Storage Fee
$19.50
Storage Fee per Unit = $0.20
$0.78
Cost / Cu Ft
$0.20
Per Unit Fee
3.1x
Q4 Peak Ratio
Blended 12-Month Projection(9 mos Base + 3 mos Q4)
$355.50$3.56 / unit
12-Month Storage Cost Projection
Jan–Dec Jan–Sep Base ($0.78/cu ft) Oct–Dec Q4 Peak ($2.4/cu ft)
Frequently Asked Questions — Amazon FBA Storage Fees
Key facts regarding cubic feet calculations, Q4 peak rates, and dangerous goods storage
How are Amazon FBA monthly storage fees calculated in 2026?▼
Amazon calculates monthly FBA storage fees based on the average daily volume (in cubic feet) your inventory occupies in Amazon fulfillment centers. Fees vary depending on item size tier (Standard vs Oversize), season (Jan-Sep base vs Oct-Dec Q4 peak), and dangerous goods classification.
Why are Q4 Amazon storage fees so much higher (Oct–Dec)?▼
During the fourth-quarter holiday peak (October 1 through December 31), fulfillment center space is in high demand. Amazon applies a peak storage surcharge—often 3× higher for standard size items—to incentivize sellers to maintain lean inventory levels.
How do I calculate the volume (cubic feet) of my Amazon product?▼
To calculate cubic feet from item packaging dimensions in inches: Multiply Length × Width × Height (in inches) and divide by 1,728 (since 1 cubic foot = 12 × 12 × 12 = 1,728 cubic inches).
What are the storage fee rates for Dangerous Goods / Hazmat in 2026?▼
Dangerous goods (such as items containing lithium batteries or flammable aerosol sprays) require special handling. In 2026, standard hazmat rates are $0.99/cu ft (Jan-Sep) and $3.63/cu ft (Oct-Dec), while oversize hazmat rates are $0.78/cu ft (Jan-Sep) and $2.43/cu ft (Oct-Dec).
What is the difference between monthly storage fees and aged inventory surcharges?▼
Monthly storage fees are charged every month for all inventory stored in Amazon warehouses. Aged inventory surcharges (formerly long-term storage fees) are additional fees applied on the 15th of each month for units stored longer than 180 days.
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