What is a good IPI score on Amazon?

Amazon considers anything above 450 acceptable and anything above 600 strong. The exact threshold for storage restrictions has shifted over the years — historically 350, then 400, then 450 — so aim for a buffer above the current limit.

What are the four IPI components?

1) Sell-Through Rate (90-day units sold ÷ average units available), 2) In-Stock Rate (percentage of time replenishable SKUs are in stock), 3) Stranded Inventory Percentage (units that cannot be sold due to listing issues), 4) Excess Inventory Percentage (units expected to sit unsold).

How often does Amazon update IPI?

IPI is recalculated weekly in the Inventory Performance dashboard. Storage limit decisions for the upcoming quarter are based on your IPI at specific cutoff dates each quarter.

How do I improve my IPI quickly?

Fix stranded inventory immediately (it is the fastest-moving lever), submit removal or disposal orders for excess slow movers, prevent stockouts on top SKUs with tighter replenishment forecasting, and pause inbound shipments of low sell-through products.

What happens if my IPI falls below 450?

Amazon imposes FBA storage volume limits for the next quarter, capped at your current stored volume plus a small allowance. New inbound shipments may be rejected once the limit is hit. The restriction is lifted as soon as IPI returns above the threshold.

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Operations

Inventory Health & IPI

IPI Score

Essential Amazon seller metric for operations

What is IPI Score?

Inventory Performance Index (IPI) is Amazon's 0-1000 score that measures how efficiently a seller manages FBA inventory. It blends four signals: sell-through rate, in-stock rate, stranded inventory percentage, and excess inventory percentage. An IPI under 450 triggers FBA storage volume restrictions for the next quarter.

Data Source

Inventory Performance Dashboard

Update Frequency

Weekly

Measurement Units

Score (0-1000)

Available at: Account

Formula

IPI = weighted score (0-1000) of: Sell-Through Rate + In-Stock Rate + Stranded Inventory % + Excess Inventory %

Worked Example

A seller with 1,800 IPI sell-through (good), 96% in-stock rate (good), 1.2% stranded inventory (good), and 18% excess inventory (average) might score around 580 IPI — comfortably above the 450 threshold but with room to improve by cutting excess stock. A seller with the same sell-through but 35% excess inventory often falls below 450 and faces storage limits.

IPI thresholds

Tier	Range / Signal
Good	Above 600 — preferred performance band; unrestricted storage
Average	450-600 — safe but exposed; small misses can trigger restrictions
Watch out	Below 450 — FBA storage volume restrictions apply for the next quarter

Frequently Asked Questions