FBA Storage Limits

FBA Storage Limits determine how much inventory a seller can have at Amazon’s fulfillment centers at any given time. Amazon imposes these limits to manage warehouse capacity across its network, ensuring that space is allocated to sellers who move product efficiently rather than those who treat fulfillment centers as long-term storage. The system has evolved significantly since its introduction, and understanding how limits are calculated and adjusted directly affects a seller’s ability to keep products in stock.

How Storage Limits Are Calculated

Amazon assigns storage limits by volume, measured in cubic feet. Limits are broken into storage types: standard-size, oversize, apparel, and footwear. Each category has its own capacity allocation. A seller might have 500 cubic feet of standard-size capacity and 200 cubic feet of oversize capacity. These numbers are independent, so maxing out one category does not affect the other.

Amazon evaluates storage limits based on the seller’s Inventory Performance Index (IPI) score. This score factors in sell-through rate, excess inventory percentage, stranded inventory percentage, and in-stock rate. Scores range from 0 to 1,000. As of recent thresholds, sellers with an IPI below 400 face reduced storage limits, while sellers above that threshold receive their full allocation. Amazon has adjusted this threshold multiple times, ranging from 350 to 500 depending on network capacity pressures.

Capacity Manager and Capacity Limits

In 2023, Amazon transitioned from the legacy storage limit system to a capacity-based model. Under the new framework, sellers receive monthly capacity limits announced several weeks in advance. These limits factor in the seller’s historical sales velocity, IPI score, shipment lead times, and the time of year. Sellers who need additional capacity can request it through Capacity Manager by specifying how much extra space they need and offering a reservation fee per cubic foot. Amazon grants additional capacity to the highest bidders first.

The reservation fee functions as a deposit. If the seller generates enough sales to offset the fee (calculated using a performance multiplier), Amazon refunds the reservation fee in the form of a credit against FBA service fees. Sellers who actually sell through the extra inventory they requested space for end up paying little or nothing for the additional capacity. Sellers who request space but fail to sell through it absorb the cost.

Impact on Inventory Planning

Storage limits force sellers to plan replenishment more precisely. Instead of shipping three months of inventory to FBA in a single batch, sellers must maintain a steady cadence of smaller, more frequent shipments. This requires forecasting demand at the SKU level and coordinating shipments so that new inventory arrives as existing stock sells down.

For sellers with seasonal products, the capacity system creates particular tension. A seller preparing for Q4 holiday demand needs to ramp inventory starting in September or October, but storage limits may not increase fast enough to accommodate the buildup. Requesting additional capacity through Capacity Manager requires committing to a reservation fee without guaranteed approval.

Strategies for Managing Storage Limits

Maintaining a high IPI score is the baseline. Liquidating slow-moving SKUs, fixing stranded inventory (listings that are suppressed or inactive), and keeping sell-through rates healthy all contribute to a better score and higher capacity allocations.

Using a domestic 3PL or prep center as a buffer warehouse allows sellers to hold reserve inventory stateside without occupying FBA space. When FBA stock runs low, the prep center can ship replenishment within two to five days. This approach is common among high-volume sellers who stage inventory at locations like MeisterPrep’s warehouses, keeping product close to Amazon fulfillment centers while staying within capacity limits.

Monitoring the restock recommendation reports in Seller Central provides visibility into when Amazon expects a seller to need replenishment and how much capacity is available. Sellers who act on these recommendations early avoid stockouts and the lost sales that come with them.