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10 KPIs to track for Amazon Sellers

On Seller Central, many KPIs are available to sellers, yet not all of them are clear on their calculation method or are too macro to have an ASIN by ASIN view.

Our Amazon experts have put together a list of 10 KPIs to focus on to effectively manage your Seller business on Amazon (if you are a vendor here is the top 10 KPIs to track for Amazon vendors).

1. In stock rate

The in stock rate, represents the number of days without a stockout. It is a key element because being out-of-stock impacts your visibility in the long term. The higher this rate is, the better it is.

πŸ”Ž How to calculate the in stock rate
On Seller central, it is possible to download the daily inventory history for each product. With a simple pivot table it is easy to identify the exact days on which there was a stock shortage. This allows you to determine possible problems at a micro level.

⏱ Frequency
We recommend you look at this KPI on a regular basis as you need to be able to react quickly if the situation gets worse.

2. Inventory performance index (For FBA sellers only)

This indicator, calculated by Amazon, is a global view of your inventory and your Β turnover rate. It is important because below 450, restrictions are automatically applied by Amazon. For example, there is a limit to the quantities that can be sent.

πŸ”Ž How to calculate the inventory performance index
The IPI (Inventory Performance Index) is directly available in Seller Central.

Top 10 KPis for Amazon Sellers - Inventory Performance Index
Amazon Seller Central - Inventory Performance Index

⏱ Frequency
Monitor this KPI monthly to make sure it stays stable.

3. Average age of inventory, or excess inventory (for FBA Sellers only)

The average age of products in Amazon warehouses or excess inventory directly impacts the IPI.

Our experts recommend aiming for a good turnover rate and doing shipments approximately every 3 months.

πŸ”Ž How to calculate the average age of inventory
The average age of the inventory is directly available in Seller Central for FBA sellers. Below is an example of very good results.

Top 10 KPIs for Amazon Sellers - FBA Inventory Age
Amazon Seller Central - FBA Inventory Age

⏱ Frequency
Monitor this KPI 2 to 3 times a month.

4. Basket analysis

To identify growth opportunities, we recommend that you regularly analyze your shopping cart KPIs:
- Average number of units purchased
- Average basket
- Average selling price of your products.

This can help you to identify potential product combinations and use virtual bundles to grow your business.

πŸ”Ž How to calculate those KPIs
All these KPIs are available on Seller Central.

We advise you to do this analysis every quarter to make sure you are on the right track and identify possible optimization opportunities.

5. Reviews

It's no secret that Amazon's A10 algorithm places a lot of importance on reviews.

This is why we advise you to keep an eye on the number of reviews and the average rating per product.

If these 2 KPIs are not good, it is important to determine where the problem is coming from. A good way to reverse the trend is to launch a vine campaign.

πŸ”Ž How to track your review score
Amazon is starting to offer a pretty clear view of these KPIs on Amazon Seller Central in the US.

Many retail analytics tools also allow you to easily monitor your popularity on Amazon. For example with the Seelk Studio.

Seelk Studio - Amazon Analytics Software
Seelk Studio

⏱ Frequency
Keep an eye on your reviews on a monthly or quarterly basis.

6. Content quality score

Content on Amazon is key because it directly impacts your conversion rate. We advise our customers to always keep an eye on their content. Indeed, content can be modified, formats changed, and images or product descriptions deleted without warning. Any changes in your content can impact your conversion rate so make sure your content is always up to date and visible.

πŸ”Ž How to calculate the content quality score
Many tools allow you to calculate your content score to identify at a glance where you need to intervene.

Seelk Studio - Content Score - Amazon Analytics Software
Content Score on Seelk Studio

⏱ Frequency
Keep an eye on your reviews on a monthly or quarterly basis.

7. Traffic KPIs

Any seller, no matter what size or category, must have a clear vision of the traffic on its product pages. This is essential because it allows you to identify areas for improvement or sudden problems that need to be addressed.

Our experts recommend tracking the number of views and sessions. These 2 indicators also allow you to evaluate if users come back to the page often before making a purchase.

And of course, the number of clicks to determine the conversion rate. A bad conversion rate can be due to bad customer reviews or a non-optimized product page for example.

Knowing which ASINs generate the most traffic also allows you to know where to look for growth or where to concentrate your investments.

πŸ”Ž How to calculate traffic KPIs
These indicators are available in Seller Central at ASIN level.

⏱ Frequency
Although it is possible to follow these KPIs on a daily basis, to get a better view, we advise you to filter by week or month. This is because there can be many variations from one day to another (weekend or week, weather, holidays etc.).

8. Buy box percentage

This KPI indicates how many times a product had the buy box. If it’s below 50%, there are improvements that need to be implemented to increase this rate and get more growth.

To increase your buy box rate we recommend 2 axes:
- The price: If the product is too expensive you will lose the buy box to a more competitive seller. You can use the dynamic price rule available on Seller Central to automatically adjust your prices to maximize your buy box holding.
- Logistics: If you are in "shipped by seller" format, switching to "shipped by Amazon" format can improve your delivery time and conditions in order to increase your buy box rate and therefore your sales.

πŸ”Ž How to calculate the buy box percentage
Your buy box percentage is available in Seller Central.

⏱ Frequency
Monitor this KPIs Weekly.

9. Refund rate

This KPIs evaluates how many times your product is returned. It should obviously be close to 0.

If you have a lot of returns, try to determine the reasons why and adapt your product page accordingly (maybe consumers misunderstood its use) or make sure that your product has no particular defects.

πŸ”Ž How to calculate the refund rate
This is available for everyone on Seller Central.

⏱ Frequency
We advise you to look at this KPI on a monthly or quarterly basis.

10. Unit session percentage

The unit session percentage, close to the conversion rate, allows you to determine out of 100 visits how many will result in a sale.

This KPI is important to determine if there is a problem with traffic or conversion. That is to say, is my conversion rate low because the traffic is low (I advertised with Β a bad keyword) or because the content is not up to date? In this case we need to review the product page.

πŸ”Ž How to calculate the unit session percentage
KPIs are available for everyone on Seller Central.

⏱ Frequency
We advise you to look at this KPI on a monthly or quarterly basis, and everytime you want to optimize your product page on Amazon.


Top 10 KPIs to track when managing advertising campaigns on Amazon.

10 KPIs to track for Amazon Sellers

Julie Cazaux

Marketing Expert & eCommerce enthusiast writing content to help brands better navigate the Amazon ecosystem.

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