International Size Charts for Shopify: US, UK, EU and CM/Inches
Learn how to build an international size chart for Shopify with US, UK, EU, AU and JP sizing, inches and centimeters, and brand-specific fit guidance.
You do not need separate Shopify product pages just because customers use different sizing systems.
A better approach is to build one international size chart that connects your own product measurements to the labels shoppers recognize in the US, UK, EU, AU, and JP markets, while displaying measurements in both inches and centimeters.
The important part is not finding a universal conversion formula. It is creating a verified size mapping for your products, because an international size conversion is rarely perfectly one-to-one across brands and categories.
Why International Size Charts Need More Than Conversion
An international size chart should translate your product’s actual fit rather than simply replacing one size number with another.
Size labels are not universal measurements
US, UK, EU, AU, and Japanese sizing systems use different labels, but even two brands using the same system can fit differently.
A shopper therefore needs more than a regional size equivalent. They also need measurements that show what your specific product means by that size.
Body and garment measurements answer different questions
Body measurements help shoppers decide which size is designed for their chest, waist, hip, or other body dimensions.
Garment measurements describe the finished product itself, such as flat chest width, inseam, sleeve length, or total garment length.
Conversion should be a reference, not a promise
A conversion column helps shoppers orient themselves, but it should not imply that two regional labels are physically identical across every brand.
Anchor the chart to verified measurements first, then add regional equivalents as navigation.
Size-chart fit: Lavar helps merchants create customizable size charts without building separate product-page layouts for every sizing group.
How to Map US, UK, EU, AU and JP Sizes
The safest mapping process starts with your own product data and adds regional size labels around it.
Choose one internal size as the source of truth
Your supplier, pattern maker, or product team should have a base sizing system such as XS–XL, numbered sizes, or product-specific dimensions.
Use that as the internal reference instead of repeatedly converting one regional chart into another.
Add a column for each market you serve
A practical international table can include one column for your brand size, separate US, UK, EU, AU, and JP reference columns, and measurement columns beside them.
| Chart Column | What to Enter |
|---|---|
| Brand Size | Your actual internal size such as XS, S, M, L |
| US | Your verified US equivalent |
| UK | Your verified UK equivalent |
| EU | Your verified EU equivalent |
| AU | Your verified Australian equivalent |
| JP | Your verified Japanese equivalent |
| Measurements | Actual body or garment measurements in inches and centimeters |
Verify each mapping against the product
Do not assume that two regional systems always move together by a fixed number. Clothing category, brand pattern, gendered sizing, footwear, and product construction can all change the mapping.
If the supplier only provides one regional label, use the product measurements to verify the additional equivalents before publishing them.
How to Show Inches and Centimeters
Dual-unit measurements make the chart more useful even when shoppers ignore the regional size-conversion columns.
Use the same measurement point for both units
Do not measure one sample in inches and a different sample in centimeters. Record one verified measurement and convert the unit.
One inch equals 2.54 centimeters, so a measurement of 20 inches converts to 50.8 centimeters.
Round consistently across the chart
Choose a consistent level of precision rather than mixing whole centimeters, one-decimal measurements, and heavily rounded inch values.
The exact rounding style matters less than making it predictable across every row.
Explain how the measurement was taken
“Chest 20 in / 50.8 cm” can still be ambiguous if the shopper does not know whether that means body circumference, garment circumference, or flat garment width.
Add short measurement notes such as “measured flat from armpit to armpit” or “measure around the fullest part of the chest.”
How Lavar Helps Build International Size Charts
Lavar gives merchants a way to present product-specific sizing guidance without maintaining separate theme code for each chart.
Create charts around your own size logic
An international size chart should follow the product rather than force every product into one generic table.
With Lavar, merchants can build customizable size charts around the measurements and labels that make sense for each product group.
Combine regional labels with real measurements
A useful chart can include market equivalents alongside bust, waist, hip, inseam, chest, sleeve, or other product measurements.
This allows a shopper to use the familiar regional label as a starting point and the measurement data as the more reliable fit reference.
Keep the chart visible on the product page
International shoppers should not need to leave the product page and search a help article to understand sizing.
Lavar lets merchants place size-chart guidance directly within the storefront so the information stays close to the size-selection decision.
Practical fit: Lavar is useful when the same Shopify catalog needs different size guidance by product while maintaining a consistent storefront experience.
Avoid One Size Chart for Every Product
International conversion becomes less reliable when one generic table is reused across products with different patterns or fit.
Separate charts by product category
A T-shirt, fitted dress, denim pant, footwear product, and oversized jacket do not need the same measurement fields.
Create charts around the dimensions that actually determine fit for each category.
Add brand-specific fit notes
Regional conversion alone does not communicate whether an item is fitted, relaxed, oversized, cropped, high-rise, or designed with extra ease.
Add concise notes beside the chart so shoppers understand how the numbers translate into the intended fit.
Update charts when the product pattern changes
A size chart becomes misleading when a supplier changes measurements but the storefront still displays the old values.
Include size-guide updates in the same product-maintenance workflow used for pricing, inventory, imagery, and descriptions.
How to Use One Product Page for Multiple Markets
Most stores can support international sizing from one product page by giving shoppers several ways to understand the same product.
Show regional labels in one table
Instead of creating separate US and European product pages, place the relevant regional references together so customers can find the system they recognize.
This also keeps reviews, inventory, product media, and merchandising attached to the same product experience.
Show both inches and centimeters
Regional size labels are helpful, but measurements give shoppers an additional way to verify fit.
Displaying both units means a US shopper can work in inches while a European shopper reads the same dimensions in centimeters.
Keep the mobile version easy to scan
International charts can become wide quickly once several market columns are added.
Prioritize the most useful columns, keep labels concise, and test whether shoppers can understand the table on a phone without losing the measurement context.
Final Thoughts
An international size chart for Shopify should connect US, UK, EU, AU, and JP labels to your own verified product measurements rather than relying on a universal conversion formula; combine those references with inches, centimeters, fit notes, and product-specific charts, then use Lavar to keep the guidance accessible without creating separate product pages for every market.
FAQ
These questions cover common sizing problems for Shopify stores selling across multiple markets.
Are US, UK and EU clothing sizes directly convertible?
Not universally. Conversion tables are useful references, but brands and product categories can fit differently, so actual body or garment measurements should remain the primary reference.
Should a Shopify size chart use inches or centimeters?
For an international store, showing both is usually clearer. Keep the same measurement points and convert each value consistently.
Do I need separate product pages for different size systems?
Usually not. One product page can show several regional size equivalents plus dual-unit measurements, while Lavar can provide product-specific size-chart guidance.
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