Mastering Amazon's IPI Score and FBA Restock Limits: Optimize Your Inventory Health

August 18, 2026 · Seller AI

Staying ahead in the competitive Amazon marketplace requires a keen understanding of inventory management. Amazon's Inventory Performance Index (IPI) score and FBA restock limits are key factors in maintaining a healthy Amazon FBA inventory.

Amazon's Inventory Performance Index (IPI) is a metric that helps sellers to understand their inventory's health by taking into consideration several factors like excess, out-of-stock, and in-stock inventory performance. This score not only impacts your selling efficiency but also determines your ability to restock your FBA inventory. Let's dive deep into what IPI is, how it affects your business, and how you can manage it effectively.

Understanding Amazon's IPI Score

The IPI score is calculated using four sub-metrics:

• Sell-through Rate: Measures the number of units sold over the units of inventory over a 60-day period.
• Excess Inventory: Identifies inventory that has been in stock for more than 90 days and has a sell-through rate lower than 8%.
• In-Stock Rate: Reflects the percentage of time a product is in stock and available for sale over a 30-day period.
• Stranded Inventory: Refers to inventory that is not in the correct warehouse and cannot be sold.

Your IPI score is updated daily and ranges from 0 to 1000. A score of 400 or above is required to maintain unlimited storage for standard-sized inventory.

Impact of FBA Restock Limits

Amazon imposes restock limits to manage warehouse capacity and ensure product availability for all sellers. If your IPI score is below 400, your restock limits will be affected:

• Restock Limits: Based on your current inventory levels and sales velocity, restock limits are set to ensure 3 to 4 weeks of inventory.
• Prep fees and Storage Fees: Exceeding storage limits may result in additional prep fees and monthly inventory storage fees.

Strategies to Improve IPI Score and Manage FBA Inventory

To improve your IPI score and manage FBA restock limits effectively, consider the following strategies:

• Optimize Product Listings: Improve product titles, descriptions, and images to increase sales velocity.
• Manage Excess Inventory: Regularly review and reduce excess inventory to minimize storage fees.
• Restock Appropriately: Monitor your inventory levels and restock only what you need to meet customer demand.
• Utilize FBA Inventory Reports: Leverage Amazon's inventory performance reports to make informed decisions about inventory levels.

Anticipate and Plan for Changes

Amazon's IPI score and FBA restock limits are dynamic and can change due to seasonality, promotions, or other factors. It's crucial to monitor these metrics regularly and adjust your inventory strategy accordingly.

By understanding and actively managing your IPI score and FBA restock limits, you can optimize your inventory health, reduce storage costs, and enhance your selling potential on Amazon.

Seller AI's AI Agents: Our AI agents are designed to streamline the complexities of Amazon's inventory management. They analyze real-time data to predict demand, optimize restocking, and manage excess inventory, ensuring that your IPI score stays healthy and your FBA inventory is aligned with Amazon's best practices.