Historical Days of Supply - How Average Shipped Units are calculated?
Hello Community,
We are struggling to understand the way the Average Shipped Units for 30 days or 90 days which is one of the two metrics to calculate Historical Days of Supply.
Average Shipped Units for us is the same for the entire family of products even though their sales vary a lot. Then the actual number is much lower than average Units Sold, Order Shipped or Units Shipped.
So how is this calculated?
3 replies
Bryce_Amazon
Hey @Seller_SQG2MR2NDAk8N,
Happy to break this down further with you!
Historical days of supply is a metric that is calculated based on average daily inventory units on hand divided by average daily shipped units, over both the long term (last 90 days) and short term (last 30 days).
Average daily shipped units is defined as: all units shipped from our US fulfillment network, regardless of customer location. For example, units shipped to customers outside of the US through Remote fulfillment with FBA are included if the units ship from our US fulfillment network.
Hopefully this helps clear some things up, but please let me know if you have additional questions.
- Bryce
Bryce_Amazon
Good afternoon,
The problem begins with Amazon calculating this on a parent level something that conceptually doesn't make any sense since variations have usually very different sales patterns.
First some context on why this is based on the parent level: Some variations of a product have uncertain demand, making it difficult for you to optimize your inventory. By calculating the metric on the parent-product level, we only charge the low-inventory-level fee when most child products under the parent product have consistently low inventory.
Currently I am not able to view your FBA inventory. To best answer your question, would you be able to provide an anonymized screenshot for me? Specifically, I'm looking for the FBA Inventory page, with the "Details" link hovered over under the Historical Days of Supply (for the ASIN you referenced in your example).
This will help me in clarifying your question, and assist in providing you an answer.
- Bryce
