Amazon FBA Storage Fee Calculator
Calculate Amazon FBA storage fees including monthly storage, aged inventory surcharges, and peak season rates. Optimize your inventory to minimize storage costs.
Product Details
Product Dimensions
Storage Period
Total projection: 3 months
Aged Inventory
Storage Utilization
Capacity Limits
Sales & Costs
Storage Fee Summary
Low Storage Risk
Total storage cost: $0
Monthly Storage Cost
$0
All monthly fees combined
Total Projection Cost
$0
For entire period
Annual Storage Cost
$0
Projected yearly expense
Cost Per Unit
$0
Storage cost per unit
% of Sale Price
0.0%
Storage cost impact on revenue
% of COGS
0.0%
Storage cost impact on margin
Inventory Metrics
Turnover Rate
0.0x/year
Times inventory sells per year
Days of Inventory
0 days
Current stock supply
Weeks of Supply
0.0 weeks
Target: 8-12 weeks
Potential Savings
$0
If optimally managed
Fee Breakdown
Storage Cost Breakdown
Fee Breakdown
Fulfillment Cost Comparison
* 3PL and self-fulfillment costs are estimates. Actual costs vary by provider and location.
Inventory Risk Assessment
LOW RISK
Understanding Amazon FBA Storage Fees: Your Complete Guide to Warehouse Costs
What are Amazon FBA Storage Fees?
Amazon FBA storage fees are monthly charges that Amazon assesses for storing your inventory in their fulfillment centers. Unlike one-time fulfillment fees charged per sale, storage fees accumulate every month your products remain in Amazon's warehouses, based on the cubic footage your inventory occupies.
These fees are calculated using precise measurements of your product dimensions (length, width, height) and vary significantly based on size tier, time of year, and storage duration. Many FBA sellers underestimate storage costs, only to discover these fees eating into their profit margins - especially during peak season (October through December) when rates increase by 175%.
How Amazon Calculates Storage Fees
Amazon uses a precise formula based on the cubic volume your products occupy in their warehouses. Here's exactly how it works:
Storage Fee Calculation Formula
- •Step 1 - Calculate Cubic Feet: Multiply length × width × height (in inches), then divide by 1,728 to convert cubic inches to cubic feet.
- •Step 2 - Multiply by Quantity: Total cubic feet = cubic feet per unit × number of units stored.
- •Step 3 - Apply Storage Rate: Monthly fee = total cubic feet × monthly rate per cubic foot (varies by size tier and season).
Important: Amazon Rounds UP Dimensions
Amazon rounds each product dimension (length, width, height) UP to the nearest inch. A product measuring 10.1 inches gets rounded to 11 inches. This means a 10.1" × 8.1" × 4.1" product is charged as 11" × 9" × 5", which can significantly increase your cubic footage calculation. Always account for dimensional rounding when estimating storage fees.
2025 Amazon FBA Storage Fee Rates
Amazon charges different storage rates depending on the season. Understanding these rate differences is crucial for inventory planning:
Standard Season (January - September)
- •All Size Tiers: $0.87 per cubic foot per month
- •This rate applies for 9 months of the year (75% of the year)
Peak Season (October - December)
- •All Size Tiers: $2.40 per cubic foot per month
- •175% HIGHER than standard season rates
- •Peak season coincides with Q4 holiday shopping (Black Friday, Cyber Monday, Christmas)
The dramatic rate increase during Q4 is designed to encourage sellers to maintain lean inventory levels during Amazon's busiest fulfillment period. Shipping inventory too early or holding slow-moving stock through Q4 can dramatically increase storage costs.
Long-Term Storage Fees and Aged Inventory
In addition to monthly storage fees, Amazon charges additional fees for inventory that sits in their warehouses for extended periods:
Long-Term Storage Fee (365+ Days)
- •Rate: Additional $6.90 per cubic foot or $0.15 per unit (whichever is greater), assessed monthly
- •Trigger: Inventory stored for 365 days or longer
- •Assessment: Checked on the 15th of each month
- •This fee is charged IN ADDITION to regular monthly storage fees
How to Avoid Long-Term Storage Fees
- •Monitor Aged Inventory Reports: Amazon provides reports showing inventory approaching the 365-day threshold.
- •Create Removal Orders: Before inventory hits 365 days, create a removal order to ship products back to yourself.
- •Discount Slow-Movers: Use Lightning Deals or price reductions to clear aged inventory before fees kick in.
- •Liquidation Programs: Amazon offers FBA Liquidations and Grade and Resell programs for clearing slow inventory.
FBA Size Tier Classifications
Amazon classifies products into size tiers based on dimensions and weight. While storage fees are the same across tiers (as of 2025), size tier affects fulfillment fees and inventory planning:
Standard-Size Products
- •Small Standard-Size: Up to 15 ounces, dimensions up to 12" × 9" × 0.75"
- •Large Standard-Size: Up to 20 lbs, longest side up to 18", median side up to 14", shortest up to 8"
Oversize Products
- •Small Oversize: Up to 70 lbs, longest side up to 60", median side up to 30", with length + girth up to 130"
- •Medium Oversize: Up to 150 lbs, length + girth up to 130"
- •Large Oversize: Up to 150 lbs, length + girth between 130"-165"
- •Special Oversize: Over 150 lbs or length + girth over 165"
Strategies to Minimize FBA Storage Fees
Smart inventory management can dramatically reduce storage costs while maintaining healthy stock levels. Here are proven strategies:
Inventory Timing Strategies
- •Avoid Pre-Q4 Shipments: Don't ship large inventory quantities to FBA in September. Wait until early October to minimize peak season storage exposure.
- •Target 60-90 Day Supply: Maintain 2-3 months of inventory based on sales velocity to balance storage costs against stockout risk.
- •Stagger Shipments: Send smaller, more frequent shipments rather than bulk shipments to reduce average inventory levels.
- •Use Inventory Performance Index (IPI): Maintain an IPI score above 450 to avoid storage limits and overage fees.
Packaging and Product Optimization
- •Compact Packaging: Reduce product packaging to the smallest possible dimensions. Remember, Amazon rounds UP each dimension to the nearest inch.
- •Minimize Air Space: Excess air space in packaging increases cubic feet unnecessarily. Use form-fitting boxes or poly mailers when possible.
- •Bundle Slow-Movers: Create product bundles with slow-moving inventory to clear aged stock while adding value.
- •Multi-Pack Options: Selling multi-packs reduces per-unit storage fees compared to individual items stored separately.
Advanced Cost Reduction Tactics
- •Seller Fulfilled Prime (SFP): For slow-moving products, consider SFP to eliminate FBA storage fees while maintaining Prime eligibility.
- •Hybrid Fulfillment Strategy: Keep fast-movers in FBA and fulfill slow-movers yourself to optimize storage costs.
- •Amazon Warehouse Deals: Use Amazon's Grade and Resell program to recover value from damaged inventory without paying ongoing storage fees.
- •Remote Fulfillment with FBA: Use one FBA location to fulfill international orders, reducing the need for inventory in multiple countries.
Who Should Closely Monitor FBA Storage Fees?
This Amazon FBA Storage Fee calculator is essential for:
- •High-Volume Sellers: Those storing 1,000+ units need precise storage cost projections to protect margins.
- •Oversize Product Sellers: Large products with high cubic footage accumulate storage fees quickly.
- •Q4 Sellers: Anyone planning inventory for holiday season needs to account for peak storage rates.
- •Low-Margin Sellers: When margins are tight, storage fees can make the difference between profit and loss.
- •Private Label Sellers: Those ordering bulk inventory from overseas should calculate storage costs before placing large orders.
Common FBA Storage Fee Mistakes
Costly Errors That Increase Storage Fees
- •Shipping Too Much Inventory Too Early: Sending 6+ months of inventory at once creates massive storage fees. Aim for 60-90 days of supply.
- •Ignoring Peak Season Timing: Not accounting for the 175% rate increase in Q4. A $100 monthly fee becomes $240 in October.
- •Forgetting Dimensional Rounding: Amazon rounds each dimension UP. A 10.1" product is charged as 11", increasing cubic footage.
- •Oversized Packaging: Using boxes larger than necessary dramatically increases cubic feet and storage costs.
- •Letting Inventory Age Past 365 Days: Long-term storage fees add $6.90/cubic foot monthly - often more expensive than the product itself.
- •Not Monitoring IPI Score: Low IPI scores trigger storage limits and potential overage fees.
Final Thoughts
Amazon FBA storage fees are one of the most overlooked costs in Amazon selling, yet they can silently erode profit margins month after month. Many sellers focus exclusively on product cost and fulfillment fees, only to be shocked by storage charges - especially when inventory sits through Q4 peak season or approaches the 365-day long-term storage threshold.
Use this calculator before placing large inventory orders, when planning Q4 shipments, and monthly to monitor storage costs as part of your overall profitability analysis. The most successful FBA sellers maintain lean, fast-turning inventory that maximizes sales velocity while minimizing storage exposure.
Remember: storage fees are charged PER CUBIC FOOT, not per unit. A single large, bulky product can cost as much to store as 10 smaller items. Factor storage costs into your product selection criteria - compact, lightweight products with fast sales velocity will always be more profitable than slow-moving, oversized inventory.
Additional Frequently Asked Questions
How does Amazon calculate cubic feet for storage fees?
Amazon multiplies your product's length × width × height (in inches) to get cubic inches, then divides by 1,728 to convert to cubic feet. The critical detail: Amazon rounds each dimension UP to the nearest inch before calculating. A product measuring 10.1" × 8.1" × 4.1" is calculated as 11" × 9" × 5" = 495 cubic inches ÷ 1,728 = 0.29 cubic feet per unit.
When do Amazon's peak season storage rates apply?
Peak season storage rates ($2.40 per cubic foot) apply from October 1 through December 31 each year. This is 175% higher than the standard season rate of $0.87 per cubic foot. Amazon implements this increase to discourage sellers from holding excess inventory during their busiest fulfillment period (Q4 holiday season). Standard rates resume on January 1.
What are long-term storage fees and how can I avoid them?
Long-term storage fees are assessed on inventory that has been stored in Amazon fulfillment centers for 365 days or longer. The fee is $6.90 per cubic foot or $0.15 per unit (whichever is greater), charged monthly on top of regular storage fees. To avoid them: monitor your Aged Inventory report, create removal orders before inventory hits 365 days, discount slow-moving products to clear them faster, or use Amazon's liquidation programs.
How often does Amazon charge storage fees?
Amazon charges monthly storage fees on the 15th of each month for inventory stored during the previous month. The fee is based on your average daily inventory volume for that month. For example, fees charged on March 15th cover inventory stored during February. Long-term storage fees (365+ days) are also assessed on the 15th of each month.
Do all FBA size tiers have the same storage rate?
Yes, as of 2025, Amazon charges the same monthly storage rate ($0.87 standard, $2.40 peak) regardless of whether your product is small standard-size, large standard-size, or oversize. However, size tier still matters significantly because it determines fulfillment fees per unit and affects how much cubic space your inventory occupies. Oversize products naturally have higher storage costs due to greater cubic footage.
What is the Inventory Performance Index (IPI) and why does it matter?
The IPI is Amazon's score (0-1000) measuring how efficiently you manage your FBA inventory. It considers excess inventory, sell-through rate, stranded inventory, and in-stock inventory. Sellers with IPI scores below 450 may face storage limits and overage fees, effectively increasing storage costs. Maintain an IPI above 450 by removing aged inventory, fixing stranded listings, and keeping inventory levels aligned with sales velocity.
Should I ship inventory to FBA before or after October 1st?
For Q4 inventory, it depends on your sales velocity. If you expect strong sales in October-December that will clear inventory quickly (within 30-60 days), ship in late September/early October. However, if you're uncertain about sales velocity or have slow-moving products, delay shipments until mid-October to minimize exposure to peak season rates. Never ship 3+ months of Q4 inventory in September - you'll pay peak rates on inventory that sits unsold.
How can I reduce my product's cubic footage to lower storage fees?
Use the smallest possible packaging for your product, eliminate excess air space with form-fitting boxes or poly mailers, remove unnecessary packaging materials like large inserts or extra boxes, and consider product design changes if you're in the product development phase. Remember that Amazon rounds each dimension UP to the nearest inch, so a product measuring 10.1" pays for 11" - optimizing dimensions to just under the next inch threshold can significantly reduce costs.
What happens if I exceed my storage limits?
If your IPI score is below 450 and you exceed Amazon's storage limits, you'll pay overage fees of $10 per cubic foot per month for excess inventory, in addition to regular storage fees. Amazon may also restrict your ability to send additional inventory to FBA until you bring inventory levels down. To avoid this: maintain an IPI above 450, remove slow-moving or aged inventory, and monitor your storage capacity dashboard regularly.
Are storage fees different for dangerous goods or special products?
Dangerous goods (hazmat products) stored in FBA follow the same storage fee structure as standard products ($0.87 standard season, $2.40 peak season per cubic foot). However, hazmat products require special handling and may have additional compliance requirements. Special categories like apparel, shoes, and media may have different fulfillment fees, but storage fees remain consistent across all product categories based solely on cubic footage and season.
Can I get a refund for incorrect storage fee charges?
Yes, if Amazon incorrectly calculated your product dimensions or charged storage fees for inventory that was not actually in their warehouse, you can dispute the charges. Common scenarios include: dimensions measured incorrectly by Amazon, fees charged after inventory was removed, or fees applied to stranded inventory being prepared for removal. Open a case with Seller Support within 90 days of the charge with your ASINs and fee details to request a refund.
How do removal orders affect storage fees?
Creating a removal order (either return to you or disposal) stops storage fees once the inventory leaves Amazon's fulfillment centers, typically within 30 days of the removal order. However, you'll still owe storage fees for the time inventory was stored up until removal. Removal fees range from $0.50-$0.70 per unit for standard-size and higher for oversize. For aged inventory approaching long-term fees, paying removal fees is almost always cheaper than paying ongoing long-term storage fees.