IPI
Also known as: Inventory Performance Index
Amazon's 0-1000 score measuring how well you manage FBA inventory health — drives capacity limits and storage fees.
IPI (Inventory Performance Index) is the score Amazon uses to evaluate how well an FBA seller manages inventory. It ranges 0-1000 and is derived from four components: excess inventory percentage, sell-through rate, stranded inventory percentage, and in-stock rate of high-demand SKUs.
Why it matters: IPI directly affects your monthly capacity limits. A high IPI score (typically 500+) gets you generous capacity, while a low IPI restricts how much you can store and may trigger storage overage surcharges. Amazon publishes the score weekly in the Inventory Performance Dashboard.
The four levers to improve IPI: (1) clear excess inventory through removal orders or aggressive markdowns, (2) keep best sellers in stock (in-stock rate is heavily weighted), (3) clean up stranded inventory daily — listings with inventory but no sellable status, (4) maintain steady sell-through across the catalog. SellerVault surfaces all four IPI components on the inventory dashboard and flags problems before they cap your capacity.