Official US to UK Shoe Size Converter
Convert US shoe sizes to UK (British) sizes instantly using our official data charts.
Whether you're shopping for British brands, traveling to the UK, or need to convert your US size for international online shopping, our converter provides accurate, ISO-standard conversions for all shoe types.
How to Convert US to UK Shoe Sizes
Step-by-Step Guide
- Know Your US Size: If you know your US shoe size, you can directly use the conversion chart or interactive converter below. UK sizes are typically 1 size smaller than US men's sizes.
- Select Your Gender: Choose whether you're converting men's, women's, or children's sizes. The conversion scales differ between genders.
- Use the Converter: Enter your US size in the interactive converter below, or find your size in the quick reference charts. The converter will instantly show your UK equivalent.
- Consider Brand Variations: While our converter uses ISO standards, some brands may have slight variations. Check brand-specific charts when available for the most accurate fit.
Quick Reference Examples
Men's Sizes:
US 9 → UK 8 (Men)
US 10 → UK 9 (Men)
US 11 → UK 10 (Men)
Women's Sizes:
US 7 → UK 5 (Women)
US 8 → UK 6 (Women)
US 9 → UK 7 (Women)
💡 Important: UK sizes are typically 1 size smaller than US men's sizes, and 1.5-2 sizes smaller than US women's sizes. For example, a men's US 10 is a UK 9.
Women's US to UK
Men's US to UK
Interactive Shoe Size Converter
Understanding US vs UK Shoe Sizing
The Problem with "Rules of Thumb"
Simple rules like "subtract 1 for men" or "subtract 2 for women" are common but not always accurate. The true relationship between US and UK sizing is not a fixed number, as it can vary based on the specific size and whether the shoe is for men, women, or children. These rules ignore the different base measurements of each system.
Using ISO-Based Charts for Accuracy
To ensure accuracy, it's best to use a conversion chart derived from the ISO/TS 19407:2015 international standard for shoe sizing. Our interactive tool and the data tables on this page use this standard, providing a reliable conversion from US to UK sizes without relying on flawed general rules.
Brand-Specific Sizing Notes
US Brands (Nike, New Balance)
Brands like Nike and New Balance are true to US sizing. The converted UK size should be a good fit when buying these brands from a UK retailer.
UK Brands (Clarks, Dr. Martens)
When buying British brands online from the US, trust their sizing. If their chart says UK 8, it is a true UK 8. Our converter will give you the correct US size to look for.
European Brands (Adidas, Puma)
These brands can be tricky. They often use EU sizing as their primary reference. An Adidas US 9 might have a different UK conversion than a standard shoe.
Frequently Asked Questions
What is US size 9 in UK?
A US size 9 is typically a UK size 8 for men and a UK size 6.5 to 7 for women. The exact conversion can vary slightly by brand and shoe type, so using a converter is recommended.
Are UK sizes smaller than US sizes?
Yes, for the same foot length, UK shoe sizes are assigned a smaller number than US sizes. For example, a men's US 10 is a UK 9.
Why are US and UK trainer sizes different?
Both sizing systems originated from the imperial system but evolved differently. They use different starting points (zero-points) and sizing increments, leading to the size difference you see today, especially in athletic trainers.
Need to Compare Specific Brands?
Shoe sizes can differ between Nike, Adidas, and New Balance. For the most accurate fit, try our dedicated brand-specific converter.
Go to Multi-Brand Converter