How to Add Sizes to Your Shopify Store

7 minute read

ThoughtMetric Metric Calculation

When it comes to running a successful online store, offering a wide range of sizes is crucial. Whether you're selling clothing, footwear, or accessories, customers appreciate having options that cater to their specific needs. In this article, we'll explore why size options are essential for your Shopify store and how you can set up and manage size variants. We'll also discuss how to customize your theme to display sizes and provide tips for effectively managing your inventory for different sizes.

Understanding the Importance of Sizes in Your Shopify Store

As a Shopify store owner, it's important to understand the impact that the sizes of your products can have on your business. While it may seem like a small detail, the sizes you offer can make a big difference in terms of customer satisfaction, sales, and returns.

Catering to a Wider Customer Base

One of the biggest reasons to offer a variety of sizes is to cater to a wider customer base. By limiting your products to only a few sizes, you may unknowingly exclude potential customers who don't fit into your size range. This can be especially problematic if you sell clothing, as people come in all shapes and sizes.

Offering a broader selection of sizes allows you to appeal to a wider range of customers, increasing your chances of making sales and building customer loyalty. When customers feel like they can find products that fit their body type, they are more likely to return to your store in the future.

Reducing Returns and Exchanges

Customers who purchase items that don't fit their body properly are likely to return or exchange them. This can be a headache for store owners, as it can lead to lost sales, additional shipping costs, and the hassle of processing returns and exchanges.

By offering multiple size options and ensuring that your size charts are accurate, you can reduce the number of returns and exchanges and save yourself time and money in the long run. Additionally, customers are more likely to be satisfied with their purchase if they receive an item that fits them well.

Enhancing Customer Satisfaction

Shopping online can be a daunting experience, especially when it comes to finding the right size. Customers may be hesitant to make a purchase if they are unsure about which size to choose.

By offering a variety of sizes and providing detailed size charts, you can make the process easier for your customers and enhance their overall shopping experience. When customers feel like they have all the information they need to make an informed purchase, they are more likely to feel satisfied with their experience.

Overall, offering a variety of sizes is an important aspect of running a successful Shopify store. By catering to a wider customer base, reducing returns and exchanges, and enhancing customer satisfaction, you can improve your chances of success and build a loyal customer base.

Setting Up Size Variants in Shopify

Shopify is a popular e-commerce platform that allows you to easily create an online store and sell your products. One of the key features of Shopify is the ability to set up size variants for your products. This allows you to offer different sizes of the same product and manage your inventory more effectively.

Creating a New Product with Size Variants

When creating a new product in Shopify, it's important to consider whether you will be offering different sizes of that product. If you are, you can easily add size variants by selecting the "Add Variant" button and entering the size and corresponding SKU (stock keeping unit).

For example, if you are selling t-shirts, you may offer different sizes such as small, medium, and large. To add these size variants, simply click on the "Add Variant" button and enter "Small" as the size and a corresponding SKU. Repeat this process for the other sizes.

If you have multiple sizes for a single product, you can add them all at once by clicking on the "Edit Options" button and selecting "Multiple Selection," then adding all available sizes in the text box. This can save you time if you have many sizes to add.

Adding Size Variants to Existing Products

If you already have products listed in your Shopify store, you may decide later to offer different sizes. Fortunately, you can easily add size variants to existing products. Simply go to the product's page and select the "Add Variant" button. From there, you can add the size and corresponding SKU.

It's important to note that adding size variants to an existing product will create a new variant, rather than updating the existing product. This means that if you have already sold some of the original product, you will need to manage the inventory levels for each variant separately.

Organizing Size Variants for Easy Management

As your store grows and you offer more products with different sizes, it's important to organize your size variants for easy management. One way to do this is by creating collections or tags and applying them to each variant. This makes it easier for you to track inventory levels for each size and restock accordingly. It also makes it easier for customers to find the size they need by filtering products by size.

For example, you may create a collection called "T-Shirts" and add all t-shirt products to that collection. Then, you can create tags for each size (e.g. "Small," "Medium," "Large") and apply them to the corresponding size variants. This will allow you to easily see how many of each size you have in stock and reorder as needed.

In conclusion, setting up size variants in Shopify is a simple process that can help you manage your inventory more effectively and offer a better shopping experience for your customers. By following these steps and organizing your size variants, you can ensure that your store runs smoothly and your customers are satisfied.

Customizing Your Shopify Theme to Display Sizes

As an online retailer, it's important to provide your customers with all the necessary information about your products, including their sizes. Fortunately, Shopify makes it easy to customize your theme to display size options on your product pages and collection pages.

Modifying Product Templates

One way to display sizes on your product pages is to modify the product template. This involves adding code to your theme's product-template.liquid file to display the size options and update the cart when a size is selected. By doing this, you can ensure that customers have all the information they need to make an informed purchase.

For example, if you sell clothing, you might want to display the available sizes for each item. This can be done by adding a dropdown menu or radio buttons to the product page. When a customer selects a size, the cart will be updated to reflect their choice.

Adjusting Collection Pages for Size Filters

In addition to modifying the product template, you can also adjust your theme's collection pages to display filters for different sizes. This makes it easier for customers to find products that are available in their size and enhances their overall shopping experience.

For instance, if you sell shoes, you might want to add a size filter to your collection page. This will allow customers to quickly narrow down their search to find shoes that are available in their size.

Implementing Size Swatches for a Seamless User Experience

If you want to take your customization a step further, consider implementing size swatches on your product pages. This allows customers to see the available sizes in a visual format and select their size directly from the product image.

For example, if you sell jewelry, you might want to display size swatches next to each product image. This will give customers a better idea of how the jewelry will look when worn and make it easier for them to select the right size.

By customizing your Shopify theme to display sizes, you can provide your customers with a better shopping experience and increase your sales. So why not take the time to make these simple but effective changes to your online store today?

Managing Inventory for Different Sizes

Tracking Inventory Levels for Each Size

To effectively manage your inventory for different sizes, you need to be able to track how much stock you have for each size variant. Shopify's inventory management system allows you to do this by setting up unique SKUs for each variant and tracking the number of items in stock for each.

Setting Up Low Stock Alerts

To ensure that you never run out of stock for a particular size, you can set up low stock alerts in Shopify. This notifies you when your stock levels for a specific size variant are running low, allowing you to restock in a timely manner.

Coordinating with Suppliers for Size Restocking

If you work with suppliers to restock your inventory, it's essential to communicate with them about which sizes are selling the most and which ones need to be restocked. This helps you maintain a consistent supply of products in all sizes and reduces the likelihood of overselling or underselling certain sizes.


Offering a range of sizes is essential for any Shopify store that sells products that come in different sizes. By understanding the importance of size options and properly setting up, managing, and displaying size variants, you can provide your customers with a seamless and enjoyable shopping experience while increasing your sales and reducing the likelihood of returns and exchanges.

Ready to dive in? Start your free trial today.

Try ThoughtMetric and start understanding the performance of your e-commerce marketing today.

Try for Free
ThoughtMetric Ecommerce Marketing Analytics Screenshot