October 20, 2026
The cleanest way to add a size chart on Shopify is to create a dedicated size chart page and link it from product pages near the size selector, either as a simple link or a popup. Stores with many product types should use metafields so each category shows its own chart. Whichever method you choose, the chart must include body measurements and garment measurements, use the units your customers think in, and work on a small phone screen.
Shoppers look for sizing help at the exact moment they pick a size, not in the footer and not after checkout. A chart link placed beside the variant picker catches hesitation at the point where it costs sales, and stores routinely see fewer size related returns after adding one.
The link text matters. Write it as the customer thinks: size guide, or what size am I. A cryptic icon or a link labeled fit notes gets ignored, and an ignored chart changes nothing.
Create a standard Shopify page containing your chart as a clean table, then add a link to it in the product template near the size options. Many themes let a page be opened in a modal from a product block, which keeps shoppers on the product page while they check measurements.
This method suits stores where one chart covers most products, like a single apparel line. The weakness appears when categories diverge: shoe sizing and dress sizing on one page becomes a wall of tables nobody reads.
For mixed catalogs, store chart content in a product or collection metafield and render it in a collapsible block or popup on the product page. Each category then shows only its own chart, and updating a chart means editing one field instead of hunting through templates.
Keep the chart itself as structured data, measurements in a table, not a screenshot. Image charts blur on phones, cannot be copied, and are invisible to search engines and screen readers. Tables are more work once and better forever.
Include both body measurements and garment measurements, and say which is which. Tell shoppers how to measure: chest at the fullest point, waist at the natural waistline, and so on. One simple diagram or a short sentence per measurement prevents most misreads.
Show inches and centimeters side by side if you sell internationally, and be honest about fit intent: this style runs small is a sentence that saves returns. Test the chart on your own phone, because a table that needs horizontal scrolling on mobile will simply not be read.
A size chart is a small feature with an outsized effect on returns. Build it once, keep it accurate when suppliers change, and treat every sizing question support receives as a chart improvement waiting to be written down.
Keep reading on this site: Index, Index, Index. Each of those pieces connects to the ideas above and gives more detail on the parts this guide could only summarize.
A popup keeps the shopper on the product page and usually converts better, but a linked page is simpler and works in every theme. Start with the link if your theme lacks a modal block, and upgrade later.
They reduce the specific return reason of wrong size, which is the largest single reason in apparel. The effect is strongest when the chart sits next to the size selector and includes honest fit notes.
Use metafield based charts per category or per product, and measure the garments yourself instead of copying supplier tables. Supplier charts disagree with each other often enough that your own measurements are the only consistent standard.