How To Add Sizes on Shopify

This detailed guide shows you how to add sizes to your Shopify store by creating size options, building helpful size charts, and connecting them to products.

Key Takeaways

• You can add up to three options (like size, color and material) and 100 variants per product on Shopify.
• A clear size chart reduces returns because wrong sizing is the top reason shoppers send products back.
• Shopify metafields let you store and display flexible size information, such as rich text, images, or variant‑specific details.

If you’re wondering how to add sizes on Shopify, you’re not alone. Many merchants who sell clothes on Shopify start with a great product and quickly realize that sizes can be confusing for customers. The good news is that Shopify includes built‑in tools for adding size options, creating size charts and making them visible on your store.

How To Add Sizes on Shopify Product Variants

Shopify lets you manage sizes as variants of a product. Variants allow customers to choose between versions of the same item. For example, a product can be offered in small, medium and large sizes. Each product can have up to three options—such as size, color, or material—and up to 100 total variants. This limit is usually enough for most stores.

Here’s how you add a size option to product variants:

1. Open Your Product: From your Shopify admin, click Products and select the item you want to edit.
2. Go to the Variants Section: Scroll down to Variants and click + Add options like size or color.
3. Add the First Option: Enter Size in the Option name field and list your values (e.g., Small, Medium, Large) in the Option values field. These names appear in the drop‑down menu on the product page.
4. Add More Options if Needed: If you sell clothing with different sizes and colors, click + Add another option and repeat the process. 
5. Save Your Variants: Click Done, then Save at the top right. Shopify automatically generates all possible combinations, but you can uncheck any variant you don’t plan to sell.
6. Customize Each Variant: After saving, you can set a unique price, SKU, inventory level or image for every variant.

Using variants is the simplest way to offer basic size choices. However, if you sell a product that needs more than three options or has many combinations, consider using a third‑party app. Many apps can provide text boxes, check boxes or image swatches so customers can choose custom sizes or measurements beyond the default limit. 

How To Add a Size Chart to Shopify Product Descriptions

A size chart is a customer service tool. To create a chart that actually helps, start by planning. Decide whether one chart covers your whole store or if each product type needs its own chart. 

Before you start, collect accurate measurements and include helpful fit notes (e.g., “fits true to size” or “model is 5 ft 9 in and wears medium”). Also, choose a format (a table, an image or a pop‑up) and think about where the chart should appear.

To add a size chart directly inside a product description:

1. Create a Dedicated Page for the Chart: Go to Online Store > Pages and click Add page. Name it “Size Chart” or “Size Guide.” In the content area, insert your measurements as a table or upload an image.
2. Insert the Chart in the Description: Open your product and click inside the description editor. You can type something like “See our Size Guide” and highlight “Size Guide,” then click the link icon to point to your new page. 
3. Use Descriptive Text: Explain how customers can measure their chest, waist, hip or foot length, and clarify whether your sizing measurements are in inches or centimeters.
4. Save and Preview: After saving, check the product page on desktop and mobile. Make sure the link or table is easy to read and not hidden far down the page.

This method works well for small catalogs or when one chart applies to many items. Because the chart is just a normal page or image, it loads quickly and doesn’t require any additional apps. If you want to reuse the chart across multiple products, linking to a single page means you only have to update the measurements in one place.

How To Use Shopify Metafields for Size Information

Metafields are powerful custom fields that let you store extra data on your products, orders or variants. For size guides, metafields allow you to insert rich text, images, or files that show specific measurements for each product. 

Here’s a step‑by‑step guide to adding size charts using metafields:

1. Plan Your Strategy: Decide whether you need separate charts for men, women or kids, choose between table or image format, and ensure the charts are accessible on all devices.
2. Access the Metafields Settings: In the Shopify admin, go to Settings > Metafields. Choose Products to create a product metafield.
3. Create a New Metafield Definition: Click Create definition, name it (e.g., “Size Chart – Men’s Shirts”) and choose a content type: Rich text for tables, File for images or PDFs, or another type if you’re advanced. You can add a description and choose validations to control input.
4. Add Size Chart Content to Products: Open a product, scroll to the Metafields section, and enter your chart or upload the image for your new metafield. For multiple products using the same chart, use the bulk editor to save time.
5. Display the Metafield on Product Pages: Go to Online Store > Themes > Customize. Open the product template, add a section or block (like Collapsible row, Tab or Pop‑up), and use the Connect dynamic source icon to select your size chart metafield. You can choose whether to display it inline, within an accordion, or as a modal. Preview on mobile, tablet and desktop to ensure it displays correctly.
6. (Optional) Make Charts Dynamic: If you have an extensive catalog, create different metafield definitions for each product type and use theme logic to display the correct chart automatically. 
7. Test the Metafields: After adding your charts, test them on different devices. Monitor return rates and customer feedback, and update charts when measurements change or customers report confusion. Metafields make it easy to update a chart once and reflect the change across multiple products.

Metafields are also useful for variant‑specific sizes. For example, if you sell shirts in regular and tall lengths, you might create variant metafields called body_length or sleeve_length. 

Create a variant metafield definition under Settings > Custom Data → Variants. After defining the name and content type, you can enter values for each variant and then connect them to your theme so that the measurements change when customers switch sizes. Doing this avoids the “variant explosion” that occurs when you create separate size variants for every measurement combination and helps you provide rich size details without overwhelming customers.

Pros and Cons of Using Metafields for Sizing 

Metafields give you tremendous flexibility but require some setup. You’ll need to connect them to your theme, which may involve editing the code or using a dynamic block. Technical setup can be tricky, and managing dozens of products manually can be time‑consuming. 

Third-party apps like Kiwi Sizing provide user‑friendly interfaces that generate charts without coding. Choose the method that balances your technical comfort with your store’s needs.

How To Add Size Guides to Shopify Navigation Menus

Once your size guides and charts are ready, you’ll want to make them easy to find. Adding them to your store’s main navigation or footer is a smart way to ensure customers see them. Shopify’s menu editor lets you add links to pages, collections, or external websites.

To add a size guide page to a menu:

1. Create the Page: If you followed the earlier steps to make a stand‑alone size guide page, you’re ready to link it.
2. Open the Menu Editor: In your Shopify admin, go to Content > Menus. Select the menu you want to edit (e.g., Main menu or Footer menu).
3. Add a New Menu Item: Click Add menu item, enter a name like “Size Guide,” and click the link field. Choose Pages and select your size guide page from the list. Avoid pasting the URL directly; selecting from the list ensures the link stays valid even if the URL changes.
4. Save: Click Add and then Save. Your size guide is now accessible from your navigation menu and will appear wherever the menu is displayed.

This small step can significantly improve user experience. Shoppers often look for sizing information before adding a product to their cart. Placing a clear link in the header or footer ensures they don’t have to hunt for it, which can reduce bounce rates and instill trust.

Simplify How You Add Sizes on Shopify With Kiwi Sizing

Adding sizes on Shopify is an important step toward making your store professional and reliable. If you look at the examples of clothing stores already thriving online, you’ll see a common theme: They make it easy for customers to find their fit. In fact, more than 23,000 active businesses now use the Kiwi Sizing app to take the guesswork out of every order.

Kiwi Sizing offers machine learning-powered recommendations and beautiful, custom size charts. This technology helps your customers feel more confident in their choices, which leads to fewer returns and more five-star reviews for your brand. Instead of spending hours answering emails about measurements, you can let your store handle the details for you.

Stop letting sizing confusion get in the way of your sales. Launch our popular Shopify size chart app today and see how much easier your business becomes when your customers have the perfect fit every time.