What is a Lot Number and why does it matter for your Business?

Stock identification is a big part of that, and it can be quite complicated. SKUs and serial numbers are identifiers that many businesses need to use regularly. Lot numbers may be lesser known, but for the businesses required to use them, they’re essential. So what are lot numbers and why do they matter?

Today, we’re going to explain the crucial role of lot numbers so you can use them effectively in your business, and so you know why you’re doing it. We’ll cover:

• What are lot numbers?

• What is the difference between lot numbers, SKUs, and serial numbers?

• Why do lot numbers matter?

• How do you create lot numbers?

• When do you need to use lot numbers?

Know the answers to these questions, and you’re one step closer to managing your inventory the way you need to!

What are lot numbers?

Lot numbers, or batch numbers, are unique identifiers assigned to a group of products that were manufactured or received together under the same conditions. Instead of tracking individual items, lot numbers allow businesses to manage products in batches, making it easier to organize and monitor inventory at scale.

A shared lot number means those products will share characteristics, such as production date, use-by date, location, or supplier, depending on how a business structures them. This makes them especially useful for tracing products across their lifecycle, from initial production to sale, and even post-sale (in terms of how the customer enjoys and then reviews the product).

Lot numbers play a key role in quality control and accountability. If an issue arises, such as a defect or safety concern, businesses can easily identify which products are affected and take action without disrupting their entire inventory, minimising the fallout of the issue. They’re also important compliance with regulations in food, pharmaceuticals, cosmetics, and other similar industries.

What is the difference between lot numbers, SKUs, and serial numbers?

Not every product number is a lot number. When you see a code written on a product, it’s important to know what you’re looking at, so here’s an outline of the most common ones (excluding barcodes. We’re trusting you to know what a barcode is!):

SKUs (Stock Keeping Units)

SKUs are internal product identifiers, meaning they’re applied by a business to its own products to track and manage inventory. Each SKU is unique to a specific product and its attributes, such as size, colour, or style, making it easy to distinguish between variations of the same item. For instance, if their is one variation of a t-shirt at a business, they may all have the SKU 123, but the different sizes will have their own SKUs because they are similar but different products, so small could be 123-1, medium 123-2, and large 123-3.

Unlike lot or serial numbers, SKUs tend to be focused on operational efficiency rather than traceability and legal compliance. Retailers, ecommerce businesses, and warehouses rely heavily on SKUs to organise stock, monitor inventory, and streamline order fulfilment. Because they are created and used internally, the same product in one business may have a different SKU somewhere else, meaning consumers don’t tend to use SKUs to find products. However, unlike both serial numbers and lot numbers, SKUs can be used on just about anything!

Serial numbers

Unlike SKUs and lot numbers, serial numbers are unique identifiers assigned to individual items rather than groups of products. Each unit receives its own number, allowing businesses to track one instance of a product at the most granular level. This is particularly important for high-value, technical, or regulated products such as electronics, machinery, or medical devices.

Serial numbers are used by manufacturers, but also retailers and service providers to manage a product all the way through its lifecycle, tracking warranties, repairs, and returns, and preventing fraud and theft. This is worth doing in industries like electronics because each item has a large value. However, you do only tend to get serial numbers in industries were the retail price of a product is significant (often in the several hundreds or even thousands of pounds)

Lot numbers

Lot numbers identify groups of products that were produced or handled in the same conditions. Unlike serial numbers and SKUs, they are neither independent, nor shared by all of the same type of product. They focus on shared origins and traceability rather than product type.

Businesses in industries where production can (infrequently) go wrong commonly use lot numbers to track manufacturing details like production dates or ingredient sources. This makes it easier to monitor quality and respond to issues affecting a specific batch, for instance, by recalling a batch to prevent all consumers having negative experiences. By sharing a lot number, businesses can isolate affected products without impacting all inventory. They help answer questions like “Which batch did this come from?” and “Where might issues have occurred?”

Why do lot numbers matter?

Lot numbers are a critical tool for maintaining control, transparency, and reliability across your operations. Here are the different areas of production and trading they help with, which have significant impact on your business regardless of how far back your business goes down the manufacturing chain:

• Product recalls. When a defect or safety issue is identified with one product, lot numbers allow you to quickly pinpoint exactly which batch is likely affected. This means you can quickly remove those products from circulation, which takes much less time, money, and effort on your part.

• Compliance with regulations. Many industries, especially food, pharmaceuticals, and cosmetics, are required to maintain traceability to ensure product tracking can be thorough. Lot numbers help businesses meet these legal requirements by providing a clear record of where products came from and how they were handled; they’re essential for keeping your business legally compliant.

• Quality control in manufacturing. By grouping products into batches, lot numbers make it easy to monitor consistency. If a product is produced poorly, you can follow it through its journey and spot what went wrong, whether it’s a faulty machine part, or an ingredient shortage or spoilage. This makes it easy to get back on track in production and to maintain high standards for your products.

• Minimising spoilage and waste. Lot numbers share expiry details, helping businesses manage stock rotation strategies like FIFO, and during product recall, allow you to only remove products that share the same number. This reduces the risk of expired or unusable products.

• Building consumer trust. When customers know products can be traced and issues handled efficiently, it increases confidence in your brand and demonstrates a commitment to safety and quality, protecting your reputation as a business.

How do you create lot numbers?

Creating lot numbers doesn’t require a universal format. Because lot numbers are created by manufacturers, they can use their own systems to do it. However, a clear process and consistency are key to producing lot numbers effectively. This means grouping the products correctly, not duplicating your numbers, and storing the data on a system that helps you trace products quickly and accurately.

A common approach is to build lot numbers using a combination of elements such as the production date, location, and a batch sequence number. For example, a lot number might include the year and month of production, followed by a code for the factory or supplier, and a unique number identifying that specific batch. This ensures that each lot number is both unique and informative. So a canning factory might group a batch of baked beans produced in February of 2025 as 2502111 if they were the 111th batch produced that month.

It’s important to keep the format simple and standardised so it can be easily understood by your team and integrated into your inventory system. Decide what information matters most to your operations, like expiry tracking or supplier traceability, and structure your lot numbers around that.

Finally, apply lot numbers consistently at the point of production or receipt, and ensure they are recorded across all systems. That way, it’s clear who bought each batch of products. Consistency is what makes the system effective.

When do you need to use lot numbers?

We’ve already outlined the general areas lot numbers are required, but it’s important to know precisely when your business will need them, so if a product falls into any of these categories, be sure to apply or check lot numbers:

• Food and beverage products. It’s important to track perishable goods, manage expiry dates, and enable fast, targeted recalls if contamination or food safety issues occur.

• Pharmaceuticals and healthcare products. The pharmaceutical industry is strictly regulated. Small issues with these products can have big consequences, meaning it's essential to be able to trace medicines, supplements, and medical supplies.

• Cosmetics and personal care items. Lot numbers help monitor product safety, ingredient batches, and shelf life, especially where skin contact or chemical stability is a concern, which is common in these industries.

• Manufacturing and industrial goods. Lot numbers are very useful in manufacturing, and can be applied to both components and finished products to trace production runs, identify defects, and support quality assurance processes.

• Agriculture and raw materials. Used to track product origin, harvest batches, and handling conditions for items like produce, seeds, or livestock-related products.

• Chemical products. Critical for safety, compliance, and tracking hazardous materials throughout production, storage, and distribution. 

Lot numbers: a lot like a safety blanket for your inventory and your customers

Lot numbers may seem like a small detail, but in the moments they come into play, you’ll be played you have them. From improving traceability and supporting regulatory compliance to enabling faster product recalls and stronger quality control, they give businesses greater visibility over their stock. Alongside SKUs and serial numbers, lot numbers fill an important gap by focusing on batch-level tracking rather than individual items or product types.

By creating a clear and consistent lot numbering system, you can streamline operations, reduce waste, and respond quickly when issues arise!

If you're looking for more ways to streamline your operations and manage your inventory, take a look at Epos Now's POS systems, which come equipped with full inventory management software, with multichannel and multi-site options available.

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