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Inventory turnover is one of the most revealing performance metrics for any Amazon seller. It tells you how many times you've sold and replaced your entire inventory within a given period.
Whether you fulfil orders through Amazon FBA, use Fulfilled by Merchant (FBM), or split across a third-party logistics (3PL) partner, understanding your inventory turnover ratio helps you make smarter replenishment decisions, protect your cash flow, and stay competitive on the Amazon U.S. marketplace.
In this ePlaybooks guide, you will find out all you need to know about Amazon inventory turnover ratio and how it is calculated and interpreted.
Inventory turnover, measured by a ratio, shows the number of times inventory is sold and replaced within a certain period. Knowing your average inventory turnover can tell you how well your business is performing.
For Amazon FBA sellers, especially, this metric is critical. Amazon's storage fee structure penalizes aged inventory. Excess stock can also trigger automatic liquidation recommendations. Staying on top of your turnover protects both profitability and your IPI (Inventory Performance Index) score.
As we already established, an inventory turnover ratio portrays how a business is able to turn its inventory into sales.
The formula used to calculate the inventory turnover ratio is:
To calculate your inventory turnover ratio, you need to do the following:
Let's look at an example. If your cost of goods sold (COGS) for the previous year is $400,000 and your average inventory was $100,000, your inventory turnover ratio will be 4.
Now you’ve calculated your inventory turnover ratio. Is it good? Is it bad? What does a low, high, or good turnover look like?
Well, there's no single universal benchmark. What counts as "good" depends heavily on your product category or industry. Consumables like supplements or grocery items turn much faster than tools or electronics. For Amazon sellers, an inventory turnover ratio between 4 and 6 is considered balanced. An above-average ratio falls between 6 and 8 plus.
Once you calculate your inventory turnover ratio, you will need to compare it with other businesses in your industry to find out if it is good or bad. However, the higher your inventory turnover ratio, the better.
If your inventory turnover ratio is a certain number, what does this mean for your Amazon business?
Firstly, comparing your inventory turnover ratio to other businesses within your industry can provide insights into how effective your inventory management is.
So if your inventory turnover ratio is low, it means that the time taken from when your inventory is purchased to when it is sold is longer.
For example, if your inventory turnover ratio is 1, it means that the inventory was sold and replaced once within that period.
A high inventory turnover rate indicates that inventory is being sold and replaced at a fast pace. Typically, this signifies that your sales performance is healthy. For example, an inventory turnover ratio of 10 within a quarter will mean that your inventory was sold and replaced ten times.
However, having an abnormally high inventory turnover ratio may signify the opposite of healthy. A very high inventory turnover ratio could mean that inventory is inadequate or insufficient, which can lead to missed potential sales. In this case, you want to evaluate revenue generated, customer demand patterns, pricing, and other aspects of your business.
Your inventory turnover ratio can give you valuable insights to help optimize your operations, increase efficiency, and improve your overall performance on the Amazon marketplace. Here are some reasons for calculating your inventory turnover ratio:
Your inventory turnover ratio shows how fast your inventory is being sold. And the more sales your business makes, the better your business is said to be performing. In other words, you can use your inventory turnover ratio to analyze your sales performance. Typically, a high inventory turnover ratio indicates a healthy business performance.
Calculating your inventory turnover ratio can help you prevent stockouts, which reduces backorders. If your inventory turnover is high due to increased demand, you can avoid running out of stock by ordering fast-moving items in large quantities ahead of time. By doing so, you can reduce backorders and keep your customers happy.
Restocking products that are slow to sell can lead to deadstock, leading to increased storage costs and wasted investments. Tracking your inventory turnover ratio can help you know which products to stop restocking altogether and which to reorder in lower quantities.
As you track your inventory turnover ratio over several years or months, you can uncover trends and customer habits that make it easy for you to forecast demand and optimize inventory levels.
If you find your inventory turnover ratio falling too high or too low, here are some tips to help you regulate it:
A low inventory turnover ratio indicates that your sales are low. And this can be a result of your marketing. You want to ensure your product page is well-optimized with the right messaging and visuals. Review your product titles and product descriptions. Are they compelling enough? Are your product images high-quality? Do a thorough review of your product page and ensure it is well-optimized to attract the right customers and ultimately increase sales.
No profit comes with having a wide range of products you can't sell. Some SKUs simply do not sell fast and are unprofitable. Keeping poor-performing SKUs only increases your storage costs and makes your inventory forecast even more challenging. On the other hand, customers may become overwhelmed with too many choices and not bother to buy from you. You want to identify and discontinue SKUs that aren't profitable.
If you are having difficulties selling your inventory, it may be your pricing. Your pricing may be too high for customers within your niche. Consider reducing your price to make your products more accessible. You can negotiate discounts with your supplier to help lower the cost of getting inventory, which in turn reduces costs for your customers. To ensure your prices stay competitive in the market, you can invest in a repricing tool.
You can get rid of your excess inventory by putting it up at lower prices. You can run a flash sale or bundle them up with fast-moving items. You can also offer promotions on those items to increase demand. Run lightning deals, apply coupons, or bundle slow movers with fast-selling products. Alternatively, if you simply can't sell them, you can offer them as freebies or donate them to charity.
One solution to a low inventory turnover ratio is to store short-term and long-term inventory in separate storage facilities. You can store slow-selling inventory in less-expensive storage facilities to reduce excess costs. So, you switch slow SKUs to FBM to remove them from FBA storage entirely while keeping the listing live.
With inventory management software, you can track inventory, monitor your inventory turnover over a period of time, and get analytics that help you track deadstock and forecast demand. Inventory management software can trigger alerts when stock hits a reorder threshold. Tools like RestockPro or SoStocked integrate directly with Seller Central.
If you find that your inventory turnover ratio is abnormally high, here are a few tips that can help:
An unusually high inventory turnover ratio indicates that you have insufficient stock relative to customer demand. Improving your demand forecasting can help you monitor sales to prevent backorders and meet customer demands. For effective demand forecasting, you can invest in good inventory management software. You can use Amazon’s Restock Inventory tool alongside your actual sales velocity data to build accurate reorder points. Factor in supplier lead times, transit time to FBA fulfillment centers, and seasonal demand spikes.
If you discover that you run out of stock and consistently replenish a particular SKU, you can consider increasing the quantity you order.
You can invest in inventory management software to take the stress out of reordering inventory. If you find that you are reordering inventory too frequently, there is inventory management software that can send reorder notifications when your inventory reaches a certain threshold.
Inventory turnover ratio is a useful metric that can help you track your performance, manage your inventory effectively, meet customer demands, and increase sales on the Amazon marketplace. Just like any other metric, calculating your inventory turnover ratio should be a continuous analysis. It is important to calculate your inventory turnover ratio frequently to ensure you are maximizing cash flow and meeting customer demands consistently. If you need professional help to improve your inventory turnover ratio and manage your Amazon account effectively, you can work with experts at ePlaybooks.
The ideal range depends on your category. Fast-moving products like consumables often have higher turnover than durable goods.
However, a good inventory turnover ratio for Amazon FBA sellers typically falls between 4 and 8 times per year. A ratio between 4 and 6 is a healthy balance where there are steady sales without overstocking. A ratio between 6 and 8+ indicates strong sales velocity.
A ratio below 3 indicates slow-moving inventory. This means you could be at risk of storage fees and cash being tied up.
Your inventory turnover ratio directly impacts your Inventory Performance Index (IPI). When your turnover is high, it tells Amazon you’re not overstocking, your products are in demand, and your inventory is being managed efficiently.
When your turnover is low, it signals excess or slow-moving inventory, poor stock planning, and increased storage risk. A low turnover ratio can hurt your IPI score, which may lead to reduced storage limits, higher storage fees, and limitations on how much inventory you can send in.
Inventory Turnover Ratio = Cost of Goods Sold (COGS) ÷ Average Inventory Value
Where:
COGS - $50,000
Average Inventory - $10,000
Inventory turnover ratio - 5
This means you sold and replaced your inventory 5 times during that period.
You’ve probably already considered selling on Amazon but its way easier than you think.
Call Us Now