Shoe Size Converter

About This Tool

The Shoe Size Converter is a comprehensive, bidirectional sizing tool designed for anyone shopping for footwear internationally. Whether you are buying shoes from a European retailer, a Japanese brand, or converting between US and UK sizes, this tool provides instant, accurate conversions across all four major sizing systems: US, UK, EU, and JP (Japanese/Mondopoint).

Why Shoe Size Conversion Matters

International shoe shopping has exploded thanks to global e-commerce platforms. A pair of running shoes from a Japanese brand, Italian leather loafers, or British brogues may each use a different sizing system. Getting the wrong size means costly returns, shipping delays, and frustration. The challenge is that shoe sizing systems were developed independently across different countries and eras, so there is no simple universal formula to convert between them.

The US sizing system, originally based on the Brannock device, uses a scale where each full size represents approximately 1/3 inch (8.46mm) of foot length. UK sizes use a similar Barleycorn-based system but start from a different reference point. European (EU/Continental) sizes use the Paris Point system where each size equals 2/3 of a centimeter (6.67mm). Japanese sizes are the most straightforward: they directly represent foot length in centimeters, making them the most intuitive system once you know your foot measurement.

How Our Converter Works

Our converter uses industry-standard size mapping tables rather than mathematical approximations. This matters because the relationship between sizing systems is not perfectly linear. For example, the gap between US 10 and US 10.5 in EU sizes is not always the same as the gap between US 8 and US 8.5. We maintain separate tables for men, women, and children because each group has distinct sizing scales. When you enter a size in any system, we find the closest matching row in the appropriate table and display all equivalent sizes.

Understanding Gender Differences in Sizing

One of the most common sources of confusion in shoe sizing is the difference between men's and women's sizes. In the US system, women's sizes are approximately 1.5 sizes larger than men's for the same foot length. This means a woman who wears US Women's 8.5 would typically wear a US Men's 7. In the UK system, there is roughly a 2-size difference. The EU and JP systems are unisex in principle, meaning the same EU or JP size corresponds to the same foot length regardless of gender, though last shapes (the mold used to construct the shoe) may differ for men's and women's footwear.

Tips for Getting the Right Fit

Even with accurate size conversion, fit can vary between brands and shoe styles. Athletic shoes often run about half a size smaller than dress shoes. Width is another critical factor that standard size numbers do not capture. If you have wide feet, look for brands that offer width options (D/E for men, B/C for women in the US system). When in doubt, order a half size up rather than down, as slightly loose shoes can be corrected with insoles, while tight shoes cannot be stretched significantly. Always measure your feet at the end of the day when they are at their largest, and measure both feet since most people have one foot slightly larger than the other.

Children's Sizing Explained

Children's shoe sizing is particularly confusing because US children's sizes run from 0 to 13, then restart at 1 for youth/adult sizes. A child's size 13 is completely different from an adult size 13. The EU system avoids this confusion by using one continuous scale from infant to adult. Children's feet grow rapidly, roughly one full size every 2-3 months for toddlers, so frequent measuring is important. Our converter includes a dedicated children's size chart to eliminate any guesswork when buying shoes for kids.