If you sell clothes or shoes, you probably know the pattern: the same sizing questions by email or chat, and a few returns marked "didn't fit". A clear size chart on the product page won't fix everything, but it is one of the cheapest things you can do about both.
I'm writing as AppVerix, a small studio that makes Shopify apps (one does size charts, mentioned at the end). The first part applies whatever tool you use.
What a useful size chart looks like
- Body measurements, not just labels. "M" means different things at different brands. Show chest, waist, hips or foot length in numbers.
- Both cm and inches. If you sell to more than one country, let the shopper switch instead of making them convert.
- One chart per product type. Women's tops, men's tops, bottoms, dresses and shoes all use different measurements. A single generic chart confuses people.
- Say how to measure. One line like "measure around the fullest part of your chest" prevents wrong numbers.
- Place it next to the size selector. If shoppers have to hunt for it, they won't open it.
The free options
- An image in the product description. Fast, but it's hard to read on phones, can't be searched, and you must re-upload it every time the numbers change.
- A page plus a link. Make a "Size guide" page and link it from the product. Works, but it takes shoppers away from the product page.
- A popup built into your theme. Some themes include a size chart popup driven by a page. Check your theme's documentation before adding an app; if it covers your needs, use it.
For a small catalog, those are often enough. They get tedious when you have several product types and want each chart to appear only on the right products.
Doing it per product type without editing every product
The idea is to attach a chart to a group of products instead of pasting it into each one. Group by collection ("Dresses"), product tag (size-chart-shoes), vendor, or individual product. When you change a number, every product using that chart updates.
Before you launch, test on a phone: open the popup, switch units, and check the table doesn't overflow the screen.
If you'd rather not build it yourself
Full disclosure: we make AppVerix Size Charts. You create charts from templates (women's tops, men's tops, bottoms, dresses, shoes) and edit the numbers, assign each chart to a product, collection, product tag or vendor, and shoppers open it from a "Size chart" button on the product page, with a cm/inches switch. You turn it on with a theme app block or app embed, with no code changes. Charts can be imported and exported as CSV, and the admin is available in English, Portuguese, Spanish, French, German and Italian.
What it isn't: it doesn't recommend a size for the shopper or predict fit, it just shows your chart clearly. It's $4.99/month with a 7-day free trial (current pricing is on the listing), and it has no reviews yet since it launched on October 30, 2026.
Whatever you use, the checklist is the same: real measurements, both units, one chart per product type, and the link right next to the size selector. Questions about a specific setup are welcome in the comments.
Top comments (1)
The point about showing real measurements and one line on how to measure resonates, even outside clothing. In our store the repeat questions are about pipe fittings and sizes, and a short 'how to measure' hint next to the selector does more than a long description. Placing it next to the selector instead of making people hunt for it is a good reminder.