Overview

Amazon's FBA capacity limits determine how much inventory a seller can store across Amazon's fulfillment network at any given time. These limits exist to help Amazon manage warehouse space efficiently, especially during periods of high demand or supply chain disruptions. For sellers, understanding how capacity limits work is essential for inventory planning, product launches, and maintaining smooth business operations.

Key Points / What Sellers Need to Know

• Capacity limits apply to all FBA sellers — Every seller using Fulfillment by Amazon is subject to storage capacity restrictions, though the specific limits vary based on individual seller performance and history.
• Limits are set on a monthly basis — Amazon provides capacity limit estimates for upcoming months, giving sellers a forward-looking window to plan their inventory replenishment and procurement decisions.
• Storage types are categorized separately — Capacity limits are broken down by storage type, including standard-size, oversize, apparel, and footwear, meaning sellers must manage each category within its own allocation.
• Performance influences your limits — Sellers who demonstrate strong sales velocity relative to their inventory levels typically receive higher capacity allocations, rewarding efficient inventory management.
• Capacity Manager lets you request more space — Amazon's Capacity Manager tool allows sellers to bid for additional storage capacity beyond their base limits by committing to a reservation fee, which can be offset through sales performance.

How FBA Capacity Limits Work

Amazon calculates each seller's FBA capacity limits using a combination of factors including historical sales volume, inventory performance, and fulfillment center availability. Rather than using the older Inventory Performance Index (IPI) score-based restock limits, Amazon now provides a single monthly capacity limit that covers all inventory sent to and stored in FBA. These limits are estimated on a rolling basis, typically providing visibility three months ahead, so sellers can see their projected capacity for upcoming periods. The system is designed to allocate more space to sellers who move inventory efficiently and less to those who store slow-moving products for extended periods.