Amazon FBA Storage Fee Calculator
Calculate Amazon FBA monthly storage fees, aged inventory surcharges, and annual storage cost projections. Compare standard vs peak season rates and optimize your inventory costs. Free, private, runs entirely in your browser.
How Amazon FBA Storage Fees Work
Amazon charges monthly inventory storage fees for every cubic foot of warehouse space your products occupy in fulfillment centers. These fees are calculated based on the daily average volume of inventory stored during the month, multiplied by the applicable rate for your product's size tier and the current season. Standard-size products are charged $0.87 per cubic foot from January through September and $2.40 per cubic foot during peak season (October through December). Oversize products have lower rates at $0.56 and $1.40 respectively, reflecting how Amazon warehouses handle larger items differently.
The cubic footage of each unit is calculated by multiplying the product's length, width, and height in inches and dividing by 1,728 to convert to cubic feet. The total storage volume is then multiplied by the number of units stored and the per-cubic-foot rate. Understanding these calculations helps sellers forecast their monthly holding costs and make informed decisions about inventory levels, especially during the expensive peak season when rates nearly triple.
Aged Inventory Surcharge Explained
Amazon applies an aged inventory surcharge on products stored in fulfillment centers for more than 180 days. This surcharge increases progressively the longer inventory sits unsold. Products stored 181 to 210 days incur $1.50 per cubic foot or $0.50 per unit, whichever is greater. The surcharge escalates through multiple tiers, reaching $7.20 per cubic foot or $2.40 per unit for items stored 331 to 365 days. Inventory aged beyond 365 days faces a $6.90 per cubic foot surcharge plus an additional $0.15 per unit.
These surcharges can dramatically increase storage costs for slow-moving products. A standard-size item costing $0.87 per cubic foot in monthly storage could face an additional $7.20 per cubic foot in aged inventory surcharges if left unsold for nearly a year. Sellers should monitor their Inventory Age reports in Seller Central and create removal orders or run promotions before inventory crosses the 180-day threshold. The FBA Inventory Age tool shows exactly how many units are approaching each surcharge tier.
Standard vs Oversize Storage Rates
Amazon classifies products into two storage categories: standard-size and oversize. Standard-size items must have dimensions no larger than 18 x 14 x 8 inches and weigh no more than 20 pounds when fully packaged. Any product exceeding these limits is classified as oversize. Interestingly, oversize products have lower per-cubic-foot storage rates than standard-size items. During January through September, standard-size storage costs $0.87 per cubic foot while oversize costs only $0.56. During peak season, standard-size jumps to $2.40 versus $1.40 for oversize.
However, since oversize products occupy more cubic feet per unit, the total storage cost per unit is typically higher for oversize items despite the lower per-cubic-foot rate. This calculator automatically detects the size tier from your product dimensions or allows manual selection, making it easy to compare costs and plan inventory strategy accordingly.
Tips to Minimize Amazon Storage Costs
The most effective strategy for reducing storage costs is maintaining lean inventory levels. Order smaller, more frequent shipments rather than storing months of supply in Amazon's warehouses. Use the Restock Inventory tool in Seller Central to optimize replenishment timing and quantities. During the transition from standard to peak season in October, reduce inventory levels to avoid paying nearly three times the standard rate on excess stock.
Monitor your Inventory Performance Index (IPI) score to maintain storage capacity. Create removal orders for stale inventory before it hits the 180-day aged surcharge threshold. Consider multi-channel fulfillment or third-party logistics for slow-moving SKUs. Running periodic promotions, coupons, or lightning deals can help move aging inventory before surcharges apply. Every dollar saved on storage fees goes directly to your bottom line.
Frequently Asked Questions
How much does Amazon charge for FBA monthly storage?
Amazon charges $0.87 per cubic foot per month for standard-size products from January through September, and $2.40 per cubic foot during peak season (October through December). Oversize products are charged $0.56 per cubic foot for standard months and $1.40 during peak season. These fees are based on the daily average volume of inventory stored.
What is the Amazon aged inventory surcharge?
The aged inventory surcharge applies to products stored in Amazon fulfillment centers for more than 180 days. It starts at $1.50 per cubic foot (or $0.50 per unit, whichever is greater) for items stored 181-210 days and increases progressively up to $7.20 per cubic foot for items stored 331-365 days. Inventory over 365 days incurs $6.90 per cubic foot plus $0.15 per unit.
How can I avoid long-term storage fees on Amazon?
Monitor your Inventory Age report in Seller Central regularly. Create removal orders for slow-moving inventory before it reaches 180 days. Run promotions, coupons, or lightning deals to accelerate sales of aging products. Maintain lean inventory levels by ordering smaller, more frequent shipments. Consider using the FBA Liquidations program for unsaleable stock.
What is the difference between standard-size and oversize for storage?
Standard-size products must be 18 x 14 x 8 inches or smaller and weigh 20 pounds or less when fully packaged. Anything larger is classified as oversize. Oversize items have lower per-cubic-foot storage rates ($0.56 vs $0.87 standard season) but typically cost more per unit because they occupy more space.
Why are Amazon peak season storage rates higher?
Amazon increases storage rates from October through December because warehouse space is in much higher demand during the holiday season. Peak rates are nearly 3x the standard rate for standard-size items ($2.40 vs $0.87 per cubic foot). This incentivizes sellers to reduce excess inventory before Q4, freeing up space for fast-selling holiday products.
How is cubic footage calculated for Amazon storage?
Amazon calculates cubic footage by multiplying your product's length, width, and height in inches, then dividing by 1,728 (the number of cubic inches in a cubic foot). For example, a product measuring 12 x 8 x 4 inches would be (12 x 8 x 4) / 1,728 = 0.222 cubic feet per unit. Total cubic footage is then multiplied by the number of units stored.
What are the best practices for Amazon inventory management?
Use Amazon's Restock Inventory tool to optimize replenishment timing. Keep 30-60 days of supply on hand rather than 90+ days. Reduce inventory before peak season to avoid triple-rate storage fees. Monitor your IPI score to maintain full storage capacity. Set up automated removal orders for inventory approaching 180 days. Use FBA New Selection program for discounted storage on new ASINs.