Amazon IPI Score: How to Keep Your Storage Limits in Check

If you have ever opened Seller Central and found a storage limit on your FBA inventory, you have met the Inventory Performance Index. The IPI score is Amazon’s way of grading how well you manage your stock. A good score gives you room to grow. A low score can cap how much you can send in, right when you need it most.

Here is what the IPI score measures and how to raise it.

What is the IPI score?

The IPI is a number between 0 and 1,000 shown on your Inventory Performance dashboard. Amazon sets a threshold score. If you fall below it, Amazon may apply storage limits to your account for the next quarter, and you may pay overage fees if you go over.

Amazon checks scores ahead of each quarter, so a weak score now can limit you during the busy season later. That is why it pays to watch it all year.

The four things that drive your score

1. Excess inventory

This is stock that Amazon thinks you have too much of, based on your recent sales. Excess inventory costs you storage fees and drags down your score.

2. Sell-through rate

This compares how many units you sold to how many you stored on average over the past 90 days. Higher is better. Slow sellers pull it down.

3. Stranded inventory

Stranded units are in an Amazon warehouse but have no active listing, so they cannot be sold. Usually it is a listing error or a suppressed product. Every stranded unit hurts your score.

4. In-stock rate

This measures how often your best selling products are in stock. Running out of your top replenishable products lowers your score.

How to raise your IPI score

• Fix stranded inventory first. It is often the quickest win. Check the Fix Stranded Inventory page every week and relist or remove those units.
• Clear excess stock. Run a coupon or a promotion, lower the price, or create a removal order for units that will not sell.
• Send smaller, more frequent shipments. This keeps stock levels closer to your real sales and lifts sell-through.
• Keep winners in stock. Use Amazon’s restock recommendations as a starting point, then adjust for seasonality.
• Use ads to move slow products. A small, focused Sponsored Products campaign can improve sell-through on slow movers.

A weekly inventory routine

1. Check stranded inventory and fix any listing errors.
2. Review your excess inventory list and plan how to move it.
3. Check days of cover for your top 10 products.
4. Plan your next shipments based on actual sales, not hopes.

Twenty minutes a week is usually enough to keep your score healthy.

Why this matters more now

With Amazon moving Prime toward faster delivery, as we covered in our post on one-day shipping, staying in stock matters even more. A healthy IPI score is what lets you keep enough inventory in the network to deliver fast.

The bottom line

The IPI score rewards sellers who stock what sells and clear what does not. Fix stranded units, trim excess stock and keep your best sellers in stock. If you want our team to look at your inventory health, request a free audit or see our catalog and account operations service.

FAQs

What is a good IPI score on Amazon?

Anything comfortably above Amazon’s current threshold is good. You can see the threshold on your Inventory Performance dashboard. Aim to stay well above it so a slow month does not put you at risk.

How often does Amazon update the IPI score?

The score updates weekly, but Amazon uses it to set storage limits ahead of each quarter.

What is stranded inventory?

Stranded inventory is stock in an Amazon warehouse that has no active offer, usually because of a listing error. It cannot sell until you fix the listing or remove the units.