Amazon IPI Score Guide 2026: What It Measures and How to Improve It
Your Inventory Performance Index score affects how much inventory Amazon lets you send in. How IPI is calculated, what the thresholds are, and the 5 levers you can pull.
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Run the numbers →What is the Amazon IPI score?
The Inventory Performance Index (IPI) is a 0–1000 score Amazon uses to measure how well you manage FBA inventory. It's primarily driven by four factors: excess inventory (are you overstocked?), stranded inventory (listings suppressed but inventory in FBA), sell-through rate (how fast does your inventory turn?), and in-stock rate (are your ASINs available?).
The threshold for 2026 is 400. Below 400: Amazon may limit your storage space and FBA inventory quantities. Above 400: full storage access. Sellers with very high scores (600+) may get additional benefits.
How to improve your IPI score
1. Clear excess inventory: Excess inventory is typically the biggest negative driver. Run promotions, discounts, or removal orders to bring down weeks-of-cover on slow-moving ASINs.
2. Fix stranded inventory: Stranded inventory (inventory in FBA with no active listing) directly hurts IPI. Check Seller Central > Inventory > Fix Stranded Inventory regularly.
3. Improve sell-through rate: Sell-through = units sold in 90 days / avg units in FBA. Improving velocity (advertising, price) and reducing stored quantity both help.
4. Maintain in-stock rate: Keep high-velocity ASINs stocked. Stockouts hurt both your IPI and your organic rank.
Frequently asked questions
What is a good Amazon IPI score? ▾
Above 400 is the threshold for unrestricted storage. Aim for 500+ to have a comfortable buffer. Above 600 is excellent.
When does the IPI score update? ▾
Amazon updates IPI weekly, on Sundays. Changes to your inventory health (fixing stranded inventory, clearing excess, improving sell-through) take 1–2 weeks to fully reflect in your score.