Common Sizing Problems
Wrong size, mixed regions, or brand fit issues? Use our converters, measurement guides, and brand size charts to avoid common sizing problems and get a better fit.
Sizing problems usually fall into three categories: ordering the wrong size because of regional confusion, not measuring and relying on an old or guessed size, or ignoring that brands fit differently. This guide explains these issues and how to use conversion tools, measurement guides, and brand charts to reduce them.
Regional mix-ups
One of the most common sizing problems is mixing up regional systems. A US men's 10 is not the same as a UK 10 or an EU 10; the numbers overlap but do not match. If you enter or assume the wrong region, you will get the wrong size. Always use a converter with the correct "from" region: for example, use our Shoe Size Converter or EU to US and US to EU pages to translate your size before ordering. Our Why EU and US Sizes Differ and How UK Shoe Sizes Differ guides explain the underlying systems. The Shoe Size Pages and Clothing Size Pages hubs list conversion pages by region and category.
Not measuring
Another common problem is relying on an old size or guessing. Feet and body measurements change; brands use different base measurements. Measuring your foot length in centimeters and using our measurement-to-size pages or the Measurement Assistant gives you a more reliable baseline. For clothing, measure chest, waist, and hips and use the Clothing Size Converter and the brand's size chart. We provide a Printable Foot Measuring Sheet and Printable Clothing Measurement Chart; the How to Measure Your Feet in CM guide explains the process. Our Common Shoe Sizing Mistakes guide covers similar pitfalls.
Brand fit differences
Even with the correct regional size, brands fit differently. Some run small (e.g. many Nike, Adidas, Zara, Shein styles), others run large (e.g. Levi's jeans). Use our Brands That Run Small and Brands That Run Large hubs for an overview, and always check the brand's official size chart—we link to many in our Brand Size Guides. When between sizes, size up for brands that run small and consider sizing down for brands that run large, in line with the brand's chart. The Shoe Fit Problems and Clothing Fit Problems pages go into more detail on fit issues.
Putting it together
To reduce sizing problems: (1) Know your size in the correct region and use our Shoe or Clothing Size Converter to convert. (2) Measure when possible and use our Measurement Assistant or printable charts. (3) Check the brand's size chart and our Brand Sizing Guide and brand-specific pages. (4) When unsure, order two sizes and return one if the retailer allows. The Measurement Tools hub and Shoe Sizing Guides hub centralize links to converters, tools, and guides.
Summary
Common sizing problems usually come from regional mix-ups, not measuring, or ignoring brand fit. Use our converters with the correct region, measure your foot or body when you can, and always check the brand's size chart. Our Shoe Size Pages, Clothing Size Pages, Brands That Run Small, and Brands That Run Large hubs, together with the Measurement Tools and Shoe Sizing Guides hubs, give you a single place to find all conversion and measurement resources.
Converters
Guides & semantic pages
Tools
Product examples (brand size guides)
Frequently Asked Questions
Why do I keep getting the wrong size?
Often it's mixing regions (e.g. using US number as EU) or not measuring. Use our converters with the correct region and measure your foot or body in cm when possible.
What are the most common sizing mistakes?
Assuming sizes are the same across countries, not measuring, and ignoring brand fit. See our Common Shoe Sizing Mistakes guide and brand size guides.
How do I fix clothing that runs small?
Check the brand's size chart and our brands that run small hub. Size up when between sizes or order two sizes and return one.
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.