What is Inventory & Inventory Management?

Inventory. What exactly is it? We all know it’s at the heart of most businesses, but what comes under the umbrella of inventory and how is that different to stock? Let’s look at what it is, and what it isn’t.

What is Inventory?

Inventory can best be described as any materials or goods that pass through or are held in your business and are necessary in order to carry out your trade. To define inventory: it encompasses a wide range of items, from raw materials used in manufacturing to finished products ready for sale to customers.

A company’s inventory is a valuable asset and plays a crucial role in inventory management strategies. Understanding inventory turnover and conducting regular inventory audits are essential practices to mitigate risks associated with excess or insufficient stock.

At its simplest, inventory is the raw materials that make up your products. For a car manufacturer, this might be metal sheets and engine parts; for a bakery, it’s flour and sugar; and for a clothing company, it’s the fabrics and threads. As these materials move through the production process, they become work in progress: partially completed goods that are still being manufactured or assembled.

Once manufactured items become finished goods, they are the inventory ready to sell to customers — and what most people think of when we’re talking about inventory. This includes packaged consumer goods, but it also includes things like office supplies, cleaning materials, and spare parts that keep the business running but aren’t part of the finished product.

Inventory allows companies to meet customer demand quickly, and provides a buffer against supply chain disruptions or unexpected demand surges — this is where having solid S&OP processes comes in to help you ensure the entirety of the business is on the same wavelength.

There are multiple benefits of being aware of your inventory — it often allows cost savings through bulk purchasing. Having enough inventory keeps production rates steady — even if you have varying demand patterns — and ensures business operations continue uninterrupted.

But inventory can also present a big challenge. Warehousing costs can be huge, and inventory can go obsolete or expire — this is especially true in industries with fast product cycles, like the food and beverage industry.

Spending money on inventory ties up capital that could be used elsewhere in the business, so this requires careful optimisation. There are some useful tips on things businesses often get wrong in this video we filmed with Deborah Dull, an expert in inventory management.

Finding the right balance here is key — businesses need enough inventory to run efficiently and meet customer demand, but not so much that it strains resources or increases risk. This is where an inventory management consultant can help — ensuring you don’t have excess inventory, and making sure that proper demand forecasting is done so you know what to order for the future too.

What About Inventory Management?

The two are intertwined, and inventory management is pretty much exactly what it sounds like it is — it’s the activity involved in making sure your inventory works for your business as cost-effectively as possible.

There are several parts to inventory management. The first part is planning. You plan what inventory you are going to hold, where it will be held, and how long you’ll hold it, and you also plan for any special care you need to take for that inventory — for example, if the inventory needs to be kept dry, warm, cold, or whatever.

You may also need to plan how to preserve your inventory. For instance, you might need to turn or check certain items of inventory on a regular basis. The next parts of inventory management are assessing and regulating your inventory.

Assessing it usually means counting it or checking it in some way. Regulating it means making sure that you’re not holding too much or too little, and that you prevent the inventory you hold from being lost, stolen, or damaged.

What’s the Difference Between Inventory and Stock?

Inventory and stock are often used interchangeably, but they’re not the same. Inventory is a much broader, more comprehensive term that encompasses everything a business owns to conduct its operations. This includes your products, but it also includes your raw materials, work-in-progress items, and even non-physical assets.

On the other hand, stock specifically refers to the finished goods that are ready for immediate sale to customers. These are the items you would find on store shelves or in warehouses awaiting distribution to customers. In short, stock is considered inventory, but not all inventory is stock — stock is a subset of inventory, and it’s the customer-ready portion of a company’s total inventory.

Inventory Management Best Practices

Good inventory management involves many best practices that help you achieve the right stock levels, reduce costs, and improve efficiency.

At the foundation is demand forecasting — looking at historical data and market trends to predict future inventory needs. This works hand in hand with good inventory accounting, which ensures accurate tracking of stock values and movements through your business.

Supply chain management is key here too. This involves working with suppliers and logistics partners to maintain optimal inventory flow. This is made easier with modern inventory management software that gives you real-time tracking, automated reordering, and detailed analytics.

One key metric to watch is inventory turnover — how quickly stock moves through your business. Higher turnover is good, whereas lower turnover rates might indicate overstocking or slow-moving products.

Different types of inventory require specific management approaches. Work-in-progress inventory needs careful monitoring to avoid production bottlenecks. Raw materials inventory must be balanced to ensure production can continue without excessive storage costs. Manufacturing inventory needs to be coordinated with production schedules and demand forecasts.

Safety stock is a buffer against unexpected demands or supply chain disruptions. The right amount of safety stock depends on lead times, demand variability, and the cost of stockouts versus storage costs.

By implementing these practices systematically, businesses can achieve better inventory control, reduced carrying costs, and improved customer satisfaction through reliable product availability.

What Different Types of Inventory Exist, Including Raw Materials?

We’ve already discussed the segregation of inventory into direct and indirect. However, inventory management is easier if we also consider the discrete stages inventory goes through in the supply chain, so we typically refer to business inventory in terms of “types”. Understanding each type of inventory is crucial for effective management and operational success.

Inventory examples include various types such as raw materials, finished goods, work in progress, and more, illustrating how these categories function within retail and manufacturing contexts.

The main inventory types are:

• Raw materials: The ingredients or components from which your business manufactures or produces the products it sells.
• Work in progress: Any inventory in the process of being transformed from one or more raw materials into a finished product.
• Finished goods: This is what we call the inventory that’s ready to be passed on to customers.

You may also hear two other types of inventory being talked about from time to time:

• Service inventory: Comprises spare parts and tools used after the sale or in service businesses.
• In-transit inventory: Inventory being moved from one point to another by road, rail, sea, or air (as opposed to riding a conveyor between adjoining warehouses, for example — this would not be classed as in-transit inventory).

Prioritisation and Preparedness in Inventory Management

The categories of inventory that you hold are determined by what you need to run your business. That often means that you’ll assign different priorities to the different types.

If you run a bar or a pub that sells beer and sandwiches, your top inventory priority is likely to be beer. Running out of sandwiches would be bad enough, but running out of beer would be catastrophic.

You can classify your inventory to have categories which are “beer priority” (top priority) and other categories. The first inventory management principle to be observed is then to not run out of the essential items that sell well and keep your business going.

The inventory turnover ratio is a key performance indicator that measures how efficiently a company’s inventory is sold and replaced over time. A high turnover ratio indicates effective inventory control and strong sales, making it crucial for prioritising inventory and measuring efficiency.

The next principle is to be prepared, occasionally, to run out of items that don’t sell as well and are non-critical to your business, if that helps you to do better inventory management overall. In other words, you’re now differentiating among items in your inventory, treating the good (fast) sellers in one way, and the slow movers in another way.

Common Questions About Inventory Answered

How Much Inventory Should I Hold?

Honestly, this is the question we get asked more than almost any other. And the answer is genuinely: it depends.

The goal is simple enough in theory. Hold enough stock to meet customer demand without tying up cash you don’t need to. Too little and you’re scrambling to fulfil orders, losing customers, and damaging your reputation. Too much and you’re paying warehouse costs on goods that aren’t moving, with the added risk they’ll expire or go obsolete before they do.

A good starting point is your inventory turnover ratio. How quickly is stock actually moving through your business? Slow turnover is usually a signal you’re holding too much. High turnover might mean you’re cutting it too fine.

Lead times matter too. If you’ve got a reliable supplier who can turn things around quickly, you can afford to hold less. If lead times are long or unpredictable, you’ll want more of a buffer.

Then there’s demand variability. A business with steady, predictable orders can run leaner than one with seasonal spikes or volatile customers.

The thing is, there’s no single right answer. You need to review it regularly as your business changes.

How Can You Lose Inventory?

It’s all too easy for an item to be in a warehouse without you knowing exactly where it is. The bigger the warehouse, the more important it is to know exactly where the item is. Inventory management consists of a set of processes for the treatment of those items so that you know exactly what you’ve got and where.

What is Inventory Control?

Inventory control is the managing and regulating of a company’s inventory levels, which is done to ensure that your company has the products available when necessary. Effective inventory control is a necessary part of inventory management because it enables businesses to maintain optimal inventory levels, which helps to reduce waste and improve efficiency.

What happens when you don’t control inventory? Well, this can lead to stockouts, overstocking, and higher costs than necessary. Inventory control helps businesses to:

• Meet customer demand
• Reduce costs by minimising excess inventory
• Improve efficiency by streamlining inventory management processes
• Enhance customer satisfaction by providing timely delivery of products

Conclusion

Getting inventory right isn’t complicated in theory — hold enough to meet demand, not so much that it drains your cash flow. In practice, it takes consistent effort across forecasting, counting, and controlling what you’ve got on hand. The businesses that do this well tend to have lower warehousing costs, fewer stockouts, and happier customers.

Those that don’t often find themselves either scrambling to fulfil orders or writing off obsolete stock at the end of the year. Whether you’re managing a handful of SKUs or thousands across multiple warehouses, the fundamentals stay the same: know what you have, know where it is, and know when you’ll need more. Start there, and the rest of your inventory management strategy will follow.