IPI Score (Inventory Performance Index) is Amazon's metric for how efficiently a seller manages their FBA inventory. Scored on a 0–1000 scale, it is updated weekly and directly affects the amount of storage space Amazon will allocate to your account.
How the Score Is Calculated
Amazon does not disclose the exact formula, but the score is influenced by four primary drivers:
- Excess inventory percentage — the proportion of your FBA stock flagged as excess (more than 90 days of supply on hand)
- FBA sell-through rate — units sold and shipped in the past 90 days divided by average 90-day inventory level
- Stranded inventory percentage — units in Amazon FCs that are not listed for sale (suppressed listings, inactive listings)
- In-stock rate — the percentage of time your replenishable ASINs were in stock
Score Thresholds
- IPI ≥ 500: Good standing. Amazon provides standard storage allocation.
- IPI 450–499: Warning zone. Amazon may begin restricting the amount of new inventory you can send in.
- IPI < 450: Storage capacity limits apply. Amazon imposes per-product storage restrictions, limiting how much of a given ASIN you can hold in FBA at one time.
These thresholds are reviewed periodically; check Seller Central for current cutoffs as Amazon adjusts them.
How to Improve Your IPI Score
- Sell through or remove excess inventory — create coupons, run Lightning Deals, or submit removal orders for slow movers
- Fix stranded inventory immediately — go to Inventory → Fix Stranded Inventory and relist or remove affected units
- Replenish best-sellers proactively — in-stock rate on high-velocity ASINs is a strong positive signal
- Avoid over-sending inventory — send conservative quantities aligned with 45–60 days of expected sales rather than flooding FBA with 6 months of stock
Where to Find Your IPI Score
Seller Central → Inventory → Inventory Performance Dashboard. The score is displayed at the top of the page with a breakdown by contributing factor.