Brands That Run Small

Many brands run small in shoes or clothing. Use our converters and brand size guides below to get the right size. When in doubt, check the brand's official chart and consider sizing up.

Sizing is not standardized across brands. A US 10 in one shoe brand can fit like a 9.5 in another; a medium in one clothing brand can feel like a small elsewhere. This guide explains why some brands run small and how to use conversion tools and brand-specific charts to choose the right size.

Why do some brands run small?

Brands use different lasts (shoe molds), fit models, and grading rules. Athletic brands like Nike and Adidas often design for a snug, performance-oriented fit, so many people find they need to size up half or a full size compared with their usual US or EU size. Fast fashion and Asian-market brands such as Zara and Shein frequently use slimmer cuts or smaller base measurements, so clothing and sometimes shoes run small relative to US or UK expectations. Uniqlo uses Japanese sizing, which tends to run smaller than US and EU; converting your measurements with our shoe size converter or clothing size converter gives you a starting point, but the brand's own chart should always be checked.

Using converters and brand guides together

Start with your known size in one system—for example, your EU shoe size or your US dress size. Use the Shoe Size Converter or Clothing Size Converter to see equivalents in other regions. That gives you a baseline. Then look up the brand's official size chart (we link to several in our Brand Size Guides hub). If the brand is known to run small, plan to size up when you are between sizes; if you are already at the top of a size range, consider the next size up. For foot length in centimeters, use our measurement-to-size pages or the Measurement Assistant tool, then cross-check with the brand.

Shoes vs clothing

Fit reports vary by category. In shoes, Nike and Adidas are often cited as running small; our EU to US and UK to US conversion pages help you translate your size before you compare with the brand chart. In clothing, Zara, Shein, and Uniqlo are commonly reported to run small; the Clothing Size Converter and Printable Clothing Measurement Chart help you work from measurements. We also offer a Printable Foot Measuring Sheet and a Fit Assistant for additional guidance. All of these are educational tools; the final decision should be based on the retailer's or brand's size chart for the specific item.

Regional conversion as a baseline

If you usually wear a certain US, UK, or EU size, use our Shoe Size Pages index and regional converters such as EU to US, US to EU, and CM to US to get the correct regional equivalent. That way you are not mixing systems (e.g. using a US number as if it were EU). Once you have the right regional size, compare it to the brand's chart. For brands that run small, sizing up from that equivalent is often the right approach. Our How Shoe Sizing Works and Common Shoe Sizing Mistakes guides explain more about regional differences and how to avoid mix-ups.

Summary

Brands that run small are common in athletic footwear and in fast-fashion or Asian-market clothing. There is no substitute for checking the brand's official size chart. Use our Shoe Size Converter and Clothing Size Converter to establish your regional size, then compare with the brand. When between sizes, sizing up usually improves fit for brands that run small. Our Brand Size Guides, Measurement Tools, and Shoe Sizing Guides hubs link to all relevant converters, tools, and guides in one place.

Converters

Guides & semantic pages

Tools

Product examples (brands that often run small)

Frequently Asked Questions

Which brands run small?

Nike, Adidas, Zara, Shein, and Uniqlo are often reported to run small in shoes or clothing. Check each brand's size guide for the specific product.

Should I size up for Nike or Adidas?

Many people size up half or one size in Nike and Adidas shoes. Use our brand size guides and converter to compare your usual size to the brand chart.

How do I convert my size for a brand that runs small?

Use our Shoe or Clothing Size Converter for your region, then check the brand's official size chart. When between sizes, consider sizing up.

GlobalSizeChart.com is an independent utility for size conversion. Our content is educational and our sizing data is compiled from public standards.

  • Independent Utility Tool — Free converters and charts, not affiliated with any retailer or brand.
  • No brand affiliation — We are not owned by or paid by any clothing or shoe brand.
  • Educational content — Guides and explanations are for information only; always check the brand's size chart when possible.
  • Sizing data compiled from public standards — Conversions are based on widely published international sizing standards; individual brands may differ.