Brand Sizing Guide
Quick answer:
How to use brand sizing guides: fit tendencies, regional conversion, and when to size up or down. Links to converters and brand-specific size charts.
See also: CM to US converter · Shoe size converter · Measurement standards
This guide explains how brand sizing works, why sizes vary between brands, and how to use our converters and brand-specific pages to get a better fit when shopping internationally or across brands. Use the sections below: Converters, Regions, Size Pairs, Guides, and Tools.
Converters
Main and category converters to get your baseline size before checking brand fit.
Regions
Convert between regions, then check the brand guide for fit tips.
Size Pairs
Single-size conversion pages; combine with brand guides for best fit.
- EU 42 to US
- EU 40 to US
- US 9 to EU
- UK 9 to US
- EU 38 to US (women's)
- CM 26 to US
- Programmatic Index (all size pairs)
Guides
Semantic guides and fit hubs.
- Shoe Sizing Guides
- Brand Size Guides
- How Shoe Sizing Works
- Why EU and US Sizes Differ
- How to Measure Your Feet in CM
- Common Shoe Sizing Mistakes
- How UK Shoe Sizes Differ
- How Japanese Shoe Sizes Work
- Brands That Run Small
- Brands That Run Large
- Nike Shoe Size Chart
- Adidas EU to US
- Puma Shoe Size Chart
- Zara Clothing Size Guide
- H&M Size Converter
- Shein Size Converter
- Uniqlo Size Guide
- New Balance Shoe Size Chart
- ASOS Size Guide
- Levi's Jeans Size Guide
Tools
Measurement and printable tools.
Frequently Asked Questions
Why do brands fit differently?
Brands use different fit models, design goals, and regional standards. Some use vanity sizing; others run true to size or small. Always check the brand's size chart when possible.
How do I convert my size for a specific brand?
Use our shoe or clothing size converter for your region, then open our brand size guides for that brand to see fit tips and any recommended size adjustments.
Where can I find all brand size guides?
See our Brand Size Guides hub for Nike, Adidas, Zara, H&M, and more. Each guide covers fit philosophy and conversion to US, UK, and EU.
Common questions
How should I use this converter?
Pick your region and size, then read the equivalents. When in doubt, measure in centimeters and compare to the brand chart.
Why do sizes differ between countries?
Each region uses its own scale; mapping through foot length (cm) reduces error.
More on Brand Sizing Guide
See linked guides on this site for measurement tips and regional differences.
Data sources
- ISO and regional footwear sizing references (length-based mapping)
- Published brand size charts (e.g. Nike, Adidas) for cross-checks—not endorsements
- International measurement and apparel sizing studies (public summaries)
Why Sizes May Vary
Shoe and clothing sizes can vary between brands due to manufacturing differences, materials, and regional sizing standards.
See also
Shoe Size Converter · Knowledge hub · Guides · Measurement standards