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What is FSN analysis in Inventory Management?

Fsn analysis
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Businesses today have the pressure to keep up with the trends and likes of the customer. Warehouse and inventory managers should proactively respond to these changing trends being one step ahead of the customer.

Businesses with excellent demand forecasting and advanced inventory management technique will be able to meet the expectations of consumers and help in managing the quality levels of their products. The ultimate goal of the inventory management process is to improve the entire supply chain function, increase revenue and efficiently allocate storage space for inventory-relevant goods.

An optimised inventory can reduce inventory carrying costs, easy to fulfil orders, manage quality, and boost inventory value. A recent study says that there was a 20% increase in productivity after establishing inventory control. Although the items inside the inventory are the ones which will generate maximum profit.

FSN inventory analysis is one of the best inventory management techniques to effectively allocate monetary resources and help in reducing inventory carrying costs at a greater level.

What is FSN analysis?

FSN analysis can be expanded as Fast-moving, slow-moving and non-moving inventory management. This type of inventory analysis is one of the best ways to manage, monitor and control inventory.

The inventory analysis classification is done based on how soon the product moves out of the inventory. It is one of the most commonly used inventory control method used by businesses. The inventory turnover ratio(ITR) is calculated for each product to classify inventory items for it under the FSN category accurately.

Fast-moving inventory

In the fast-moving inventory, the products are moved in limited quantities and immediately become out of stock. So these items have the highest replenishment rate. So in this category, the items comprise less than 20%.

Slow-moving inventory

This category includes about 35% of the inventory. Here, the item moves very slowly and has the lowest replenishment rate.

Non-moving inventory

The items that aren’t moving or least moving are classified under this category. It also contains dead stock. It covers almost 50-55% of the items stored in the inventory. It is a category which is mostly ready for disposal. A report is sent to the management regarding this category and a loss is created.

In the FSN analysis inventory management technique, the main goal is to reduce material costs, labour costs and turnover costs. And here are some parameters of the FSN analysis :

The consumption rate of a product – In a given period, the percentage consumption rate, at which stocks get expended or replenished.

The average stay in inventory – The average percentage stay of each item in the inventory, till the time it is sold.

Period of analysis – Specify when you are conducting inventory analysis, whether in six months or in a year.

The inventory turnover ratio for fast-moving items is more than 3, for slow-moving items, it is between 1-3 and for non-moving items it is less than 1. FSN infographic

How to conduct FSN analysis?

FSN analysis is functional for effective managing of the total inventory, order fulfillment process, inventory space management and reducing inventory costs.

The FSN analysis for inventory control can be done by following the below steps :

Step 1: Make an inventory item list and calculate the annual demands, unit price and annual consumption rate of each product.

Step 2: The existing inventory items should be arranged in decreasing order of the inventory based on their annual usage.

Step 3: Calculate the percentage of annual usage and the average cumulative stay and percentage of annual usage for each of the existing inventory items.

Step 4: Group the inventory under the F, S, and N category. It is done depending on the cumulative percentage of annual demand.

Also Read :10 Inventory Management Trends to Watch for in 2023

The following data should be collected to perform the FNS analysis effectively –

  • Name
  • Turnover ratio
  • The annual demand for a specific item.
  • Unit price of each product.
  • Annual usage of each item.
  • Cumulative consumption rate of each product.

Note that the turnover ratio is calculated using this formula :

Turnover ratio = Annual demand/ Annual inventory

Next, the annual usage of each inventory product is calculated after calculating the annual percentage usage of each inventory item.

Here is the formula to calculate annual usage –

Annual Usage of each item = Annual Demand of each item * Unit Price of each item

Calculate the cumulative percentage of the usage of each item with this formula.

Cumulative percentage usage of first item = Annual percentage usage of the first item

Cumulative percentage usage of 2nd item = Cumulative percentage usage of 1st item + Annual percentage usage of 2nd item

So, after all these calculations, the inventory products are segregated into their allotted classes – fast-moving category, slow-moving category and non-moving category.

According to the inventory and consumption rate, 70% is the fast-moving inventory of the annual consumption rate, 20% is the slow-moving and 10% of the items cover the average consumption rate.

Also Read : What is ABC Analysis in Inventory Management System?

Advantages of the FSN analysis technique

FSN analysis is effective in getting a better understanding of the inventory and its computation of the average stay of each item in the inventory. And the products are classified based on the parameters mentioned above.

Let’s discuss more advantages of FSN analysis :

  • FSN analysis is efficient to get a find dead stock and reducing its overstay in the inventory.
  • A particular technique to effectively manage the inventory will change the behaviour of the supply chain process.
  • A successful method to find the active goods in the inventory. If the FSN analysis is closely inspected, the shifting trend from one product to another can be closely monitored.
  • It helps retailers to make better decisions regarding the product’s future benefits for the business helping them to adjust their strategies accordingly.
  • It helps in reducing inventory carrying costs such as storage, insurance and depreciation, and eliminates stock overstays.
  • An effective method to increase revenue is by focusing on fast-moving goods and reducing the production of slow-moving or non-moving products.

Disadvantages of the FSN analysis in inventory management

There are multiple benefits to this technique But it’s not free of disadvantages. To segregate the products there are more calculations with multiple formulas. If any error occurs in one of the calculations, it will be a faulty outcome. For example, due to miscalculations, you may ask a supplier for more slow-moving products assuming them to be fast-moving and later regret the action when the demand dips.

In addition, frequent changes in product trends impact the business, so the inventory manager may find it difficult to compute the product analysis more often.

What is the reason for slow-moving and non-moving inventory?

Let’s discuss some of the reasons for slow and non-moving inventory.

  • If the production team failed to inform about the requirements of the modified raw materials list, it may compromise the quality of goods resulting in going under the slow-moving or non-moving category.
  • If the inventory is not reviewed periodically, the production team will unnecessarily manufacture obsolete goods.


FSN analysis helps in classifying inventory analysis based on consumption rate. It is an effective method to understand and articulately forecast demand. It is useful for analysing fast-moving, slow-moving goods and non-moving items. It also helps in making data-driven decisions for the company which will help in increasing profits.

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