This page provides answers to common questions about Inventory Performance Index (IPI).
IPI score measures efficiency and productiveness of your FBA inventory. Multiple factors influence your IPI score. However, to get you started with learning how to manage IPI: 1) maintain a balanced inventory level between sold and on-hand inventory and 2) fix listing problems.
Your IPI score is designed to represent your overall inventory performance. When you take actions to improve your inventory efficiency, they can take time to result in IPI improvements.
While every sellers’ business is different, we recommend the following general guidelines to manage your inventory performance:
New ASINs in their first 90 days don’t affect your IPI score.
Once a removal order request is placed, the inventory no longer affects your IPI score. Remember that actions taken today, such as removal order, will take time to be reflected in your IPI score.
You can improve your sell-through by increasing sales of your on-hand inventory or removing the inventory that is not selling. To improve sales, consider your pricing, and where applicable, create sales, improve keywords, or advertise to promote your listings, such as using Sponsored Products. Consistently sending high volumes of inventory to Amazon may impact your sell-through rate if your volume of sales is not increasing at the same rate over the same time period.
Sell-through rate is updated daily and looks at past 90 days of shipped units and average inventory over that same period. We encourage you to try to maintain a sell-through rate in the green (or “good” rating) year round.
Your FBA sell-through rate is your units sold and shipped over the past 90 days divided by the average number of units available at fulfillment centers during that time period. We take a snapshot of your current inventory levels of 30, 60, and 90 days ago,to calculate the average units available. For example: You shipped 120 units in the past 90 days, and you had an average of 80 units available during that time period. Your sell-through rate would be 120/80 = 1.5, as shown below.
|Total units sold (cumulative) in past 90 days||120 units|
|Date||Today||30 days ago||60 days ago||90 days ago|
|Inventory available||80 units||150 units
(new shipment of 150 units received)
|40 units||50 units|
Average available inventory = (50 + 40 + 150 + 80) / 4 = 80 units
Sell-through rate = 120/80 = 1.5
An IPI score is available only for sellers with a Professional selling plan, inventory at a fulfillment center, and recent account activity. If you are new to FBA or have not been active in the past 13 weeks, you may not have an IPI score until more data is available.