EcommerceFeb 14, 2023

What is an SKU Number? (Guide for Businesses)

Rabia Taskiran
Content Marketing Specialist

The biggest challenge for e-commerce businesses and retailers is inventory management.

By creating an SKU number system, e-commerce businesses and retailers can professionally track the inventory, organize the warehouse, increase the visibility of the sales data, improve customer experience, identify products, and many other benefits.

In this blog article, we will explain what exactly an SKU number is and how you can create your own SKU number.

What is an SKU Number?

SKU means Stock-Keeping-Unit and is a barcode, which consists of letters and numbers

With the SKU number, you can easily follow all details of the product like price, product details, manufacturer, stock level, size, color, etc. 

The SKU Number has the following functions:

  • Identifying a product
  • Tracking inventory
  • Identifying the most profitable products
  • 8 – 10 characters long
  • Seeing all the details of the product

Difference between SKU and UPC

SKU is used for warehouse management and is an alphanumeric code. E-commerce businesses can create their own SKU codes.

UPC is a barcode and is used for identifying products and manufacturers. Unlike the SKU, the UPC consists of numbers only. 

SKU Number

Here is a summary:

SKU (Stock Keeping Unit)

  • Internal use
  • Between 8 and 12 characters
  • Used to track inventory
  • Alphanumeric
  • Individuals for each e-commerce company

UPC (Universal Product Code)

  • International use
  • Always 12 characters long
  • Identifies manufacturers and products
  • Consists of numbers only
  • Used by the Global Standards Organization

How to create an SKU Number?

Now let’s see how you can create your own SKU number. 

1. Top-level identifier

Define a top-level identifier of 2 – 3 characters. Your top-level identifier is the first character of your SKU number and can be a category, supplier, or department.

2. Middle Numbers

Now you must define the middle numbers, which exist of the unique features of your product like color, size, category, or other features that help you organize your products.

3. Sequential number

Finish your SKU number with a sequential number that helps you to identify your older and newer products for example 001, 002, 003. Or like we said before, whatever makes logical sense for the products you sell.

4. POS & Inventory management system

After you have defined your SKU number, you can add it to your POS, inventory management system, or e-commerce platform. After you added your SKU number to one of these systems you can create scannable SKU barcode labels for easy checkout and inventory counting.

With the e-commerce platform ikas you can easily create barcodes for your products. The function “Scan barcode” enables you to connect your barcode reader with the ikas e-commerce platform. When you scan the barcode, the ikas e-commerce platform automatically counts your inventory. 

SKU Number Example

Imagine you sell face cleansers and your brand name is “Kadarius”. To create an SKU number you must list the needed attributes of the product and define for every single attribute an indication.


  • Brand: Kadarius (KA)
  • Category: Face (02 or FA)
  • Type: Natural (100 or NA)
  • Gender: Women (01 or WO)
  • Size: 200 ml (200)

Now you can create an SKU Code in two different ways: Either you create an alphanumeric SKU code or only one with letters

SKU code example for the Kadarius face cleanser:

  1. KA-02-100-01-200
  2. KA-FA-NA-WO-200

You should keep your SKU number short to make the consignment as easy as possible. If you sell only one product, for example t-shirts, you can use the same SKU number for all products and only add a number at the end. 

SKU Number FAQs

Is the SKU Number the same as the Item Number?

The SKU Number is at the same time also the item number of the product.

Do my products need an SKU Number?

All products need a unique identifier. That means you should use SKU numbers for all your products to differentiate from another and to follow the inventory of every single product.

Can two products have the same SKU Number?

No. Every product should have another SKU number to follow the correct inventory and details of the product. But if you need to use the same SKU number for two different products, you can add at the end of the SKU number a letter or number.

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