Amazon IPI Score and FBA Capacity Limits: How to Improve Both and Ship More

Few things frustrate a growing Amazon brand more than having demand and no room to ship. You plan a big restock, open Seller Central and find your FBA capacity limit will not let you send what you need. Behind those limits sits one number Amazon watches closely: your Inventory Performance Index, or IPI score. Understanding your Amazon IPI score and how FBA capacity limits work is now part of running a healthy business on amazon.com. This guide explains what the IPI score measures, how it connects to capacity, and practical steps to improve both.

What Is the Amazon IPI Score?

The Inventory Performance Index is a score Amazon gives FBA sellers to show how efficiently they manage inventory in Amazon's fulfillment network. It is shown on the Inventory Performance dashboard in Seller Central and is updated regularly. A higher score tells Amazon you sell through what you send, avoid excess stock and keep your listings available — in other words, you use warehouse space well.

Amazon has changed the exact thresholds and the way the score feeds into storage over the years, so always check the current figures in your own dashboard. What has stayed consistent is the direction: better inventory habits lead to a better score and more flexibility.

What Drives Your IPI Score

Notice the balance here. Amazon penalizes both too much stock and too little. The goal is not to ship less — it is to ship the right amount of the right products.

How FBA Capacity Limits Work

FBA capacity limits control how much inventory you can send and store, measured in cubic feet. Amazon sets them monthly by storage type, such as standard-size and oversize, and bases them largely on your recent sales history and forecasted demand. Your performance, including your IPI score, influences how much flexibility you get.

Amazon has also offered ways to request extra capacity, at times through a reservation-fee model where you bid for additional space. Programs and fees change, so read the current terms in the Capacity Monitor before relying on them for a big shipment such as Q4.

9 Ways to Improve Your Amazon IPI Score

1. Fix Stranded Inventory First

Stranded units are the easiest win because they are already in Amazon's warehouse and cannot sell. Resolve listing errors, relist suppressed offers or create removal orders. Our guide to fixing Amazon stranded inventory covers the step-by-step process.

2. Clear Excess Stock

Run coupons, Prime Exclusive Discounts or a price drop on slow movers. If a product will not sell through at a reasonable price, consider removal, liquidation or FBA Grade and Resell where available, before aged-inventory surcharges add up.

3. Send Smaller, More Frequent Shipments

Shipping six months of stock at once inflates your inventory and lowers sell-through. Sending four to eight weeks of cover more often keeps the ratio healthy. Many brands keep extra stock in a third-party warehouse or Amazon Warehousing and Distribution and replenish FBA from there.

4. Stay In Stock on Best Sellers

Stockouts hurt your in-stock rate, your IPI score and your organic rank. Track days of cover for each top ASIN and reorder based on lead time plus a safety buffer.

5. Increase Sell-Through With Better Listings

A listing that converts better sells more of the same stock. Stronger images, clearer bullets and A+ Content raise sell-through without sending a single extra unit.

6. Use Ads to Move Slow Inventory

Targeted Sponsored Products campaigns on slow-moving ASINs can lift sell-through. Keep the budget controlled and watch ACoS — the aim is to move stock profitably, not at any cost.

7. Retire Products That Do Not Earn Their Space

Some ASINs sell a few units a month while taking up capacity your best sellers need. Review your catalog each quarter and phase out the ones that do not pull their weight.

8. Forecast Around Seasonality

Seasonal products should arrive shortly before demand rises and sell through before it falls. Planning inbound timing around Prime Day and Q4 keeps you from sitting on excess in quieter months.

9. Review the Dashboard Weekly

Amazon's recommendations update constantly. A short weekly check catches new stranded units and excess stock before they hurt your score. For a broader approach, read our Amazon inventory management best practices.

Why IPI Matters for Growth, Not Just Storage

It is easy to treat the IPI score as an operations metric, but it directly affects sales. Limited capacity means you cannot stock up for peak season. Stockouts stop your ads and damage organic rank, and recovering lost rank can take weeks. Excess inventory ties up cash that could fund advertising or new products, and long-term storage fees eat into margin. Brands that manage inventory well can scale faster because they have room, cash and consistent availability. If your sales have suddenly slowed and inventory is part of the story, our guide on why Amazon sales drop suddenly can help you diagnose it.

IPI and Capacity Mistakes to Avoid

• Shipping everything before Q4: sending all your holiday stock in one go can leave you with excess in January and higher storage fees
• Ignoring small stranded counts: a few stranded units across many ASINs add up and quietly drag your score down
• Cutting stock on best sellers to "fix" IPI: this trades a better score for stockouts, lost rank and lost sales
• Leaving dead stock for months: aged inventory becomes more expensive every month it sits in a fulfillment center
• Planning without lead times: if your manufacturer needs 60 days and shipping takes 30, your reorder point must reflect that

The best results come from treating inventory, listings and advertising as one plan. When your ads team knows which products are overstocked and which are running low, they can push the slow movers and protect the products close to a stockout. When your operations team knows which promotions are coming, they can send stock in time. That kind of coordination is what keeps both your IPI score and your sales moving in the right direction.

Frequently Asked Questions

What is a good IPI score on Amazon?

Amazon has historically treated 400 or higher as a healthy benchmark, but thresholds have changed over time. Check the guidance shown on your own Inventory Performance dashboard.

How long does it take to improve my IPI score?

Because the score is based on recent performance, improvements usually show over several weeks. Fixing stranded inventory and clearing excess stock tend to have the quickest effect.

Does a low IPI score affect my search ranking?

Not directly. But the problems behind a low score, especially stockouts, do hurt sales and organic rank.

Do new sellers have an IPI score?

New sellers need some sales history before a score is calculated. Until then, Amazon sets capacity using its own estimates.

Final Thoughts

Your Amazon IPI score rewards brands that send the right stock at the right time and keep it selling. Fix stranded units, clear excess, stay in stock on your best sellers and make listings convert better — and capacity limits stop being a ceiling on your growth.

Struggling with capacity limits or aging stock? SellerTune's Amazon inventory management team can build a replenishment plan for your catalog. Get your free Amazon audit.