US to UK Shoe Size Calculator

Size Conversion Charts

Use the interactive charts below to quickly find your UK shoe size from your US size.

Visual Size Comparison

Understanding US and UK Shoe Sizing

While both the United States and the United Kingdom share a common language, their shoe sizing systems have some key differences that can cause confusion when shopping across the Atlantic. Understanding these differences is essential for getting the right fit.

Both systems are based on the barleycorn measurement (1/3 of an inch), which dates back to medieval England. However, they use different starting points and have separate scales for men and women.

Conversion Formulas

Converting between US and UK shoe sizes is straightforward once you know the rules:

For example:

• Men's US 10 = UK 9
• Men's US 12 = UK 11
• Women's US 8 = UK 6
• Women's US 10 = UK 8

Why Are US and UK Sizes Different?

The difference between US and UK shoe sizes stems from historical factors:

• Different zero points: The UK system starts from a larger "size 0" for infants, while the US system has a different starting point.
• Evolution over time: When America developed its own shoe industry, manufacturers made small adjustments to the British system.
• Standardization: Each country developed its own industry standards independently, leading to the differences we see today.

Half Sizes and Width

Both US and UK sizing systems use half sizes to provide a better fit. The half size represents approximately 4.23mm (1/6 inch) in length.

Width is also important for finding comfortable shoes. In both countries, shoes come in various widths:

• Narrow: AA or N
• Standard/Medium: B (women), D (men)
• Wide: D (women), E/EE (men)
• Extra Wide: EE (women), EEE/EEEE (men)

Tips for Buying Shoes Internationally

1. Always check the brand's size chart: Some brands may vary from standard conversions.
2. Know your foot measurements: Having your foot length in centimeters helps verify any size.
3. Consider the type of shoe: Athletic shoes may fit differently than dress shoes.
4. Read reviews: Other buyers often mention if shoes run large or small.
5. Check return policies: Make sure you can exchange if the size isn't right.

Children's Shoe Size Differences

Children's shoe sizes also differ between the US and UK:

• UK children's sizes range from 0-13, then continue to adult sizes
• US children's sizes range from 0-13.5, then transition to youth/adult sizes
• The conversion is generally US = UK + 1 for children

Common Shopping Scenarios

Here are some common scenarios where you might need to convert sizes:

• Online shopping from UK retailers: Sites like ASOS, Clarks, or Church's use UK sizing
• Shopping in London: All British shoe stores display UK sizes
• Buying British brands in the US: Some may label shoes in UK sizes
• Vintage or second-hand shoes: Older shoes often only show UK sizes

Shoe Size History

The barleycorn system has been used since the 14th century when King Edward II of England decreed that three barleycorns (grains of barley) laid end to end would equal one inch. This measurement became the basis for shoe sizing in English-speaking countries.

The system was designed so that each whole size represents a difference of one barleycorn (approximately 8.46mm or 1/3 inch). Half sizes were introduced later to provide a more precise fit.