Amazon IPI Score: What It Is and How to Keep It Above 400

What the score measures

IPI is scored on a 0-1000 scale; most sellers fall somewhere between 300 and 800. It's only shown to sellers on a Professional selling plan who have active FBA inventory and recent (trailing 13-week) activity — new sellers or those using FBA purely for multi-channel fulfillment may not have a score at all.

The four factors behind it

Amazon's Inventory Performance dashboard scores four categories:

1. Excess inventory percentage — inventory supplying more than 90 days of forecasted demand is treated as excess; Amazon recommends maintaining 30-60 days of coverage instead.
2. 90-day sell-through rate — a rolling measure of how fast inventory is selling relative to how much you have on hand.
3. Stranded inventory percentage — inventory that's in stock but can't be sold because of a listing problem.
4. In-stock rate — whether your best sellers stay in stock, weighted toward your trailing 30- and 60-day sales.

New ASINs get a 90-day grace period before they count toward the score at all. Once you submit a removal order or liquidation request, that inventory stops counting toward IPI immediately — though the score itself takes time to reflect the change, since it's calculated on a rolling basis rather than resetting instantly.

Score bands and the 400 threshold

The current key threshold is 400. Falling below it can trigger FBA storage limits the following quarter. Reported score bands:

Separately, Amazon's FBA New Selection program has its own, different eligibility requirement: a score of 300 or higher to qualify for that specific program. That's a distinct threshold from the 400 line tied to general storage limits, so don't confuse the two when reading about IPI requirements.

Amazon evaluates IPI at the end of each quarter and uses that score to set your storage capacity limit — measured in cubic feet — for the following quarter. Because Q4 demand is highest, a low score going into the holiday season is especially costly.

Why quick fixes don't move the score fast

Amazon calculates sell-through and other components on a rolling basis (roughly the trailing 90 days), so a short burst of activity right before a quarterly evaluation has limited effect. As an example of how sell-through rate is calculated: if your average available inventory over four weeks was (50+40+150+80)/4 = 80 units, and you sold 120 units, your sell-through rate is 120/80 = 1.5.

Submitting removal orders does not raise your IPI score on its own — it only stops the score from continuing to decline, since the affected inventory simply stops counting against you going forward.

How to improve it

• Fix stranded listings by relisting the item or submitting a removal order for the affected inventory.
• Reduce excess inventory by actively clearing out the SKUs contributing the most to your excess percentage.
• Improve sell-through with advertising and listing optimization to move inventory faster.
• Protect your in-stock rate by avoiding stockouts on your best sellers, since running out of your most reliable products can drag this metric down even while everything else looks fine.