Free Shoe Size Converter

A shoe size converter translates between the different sizing systems used around the world. The United States, United Kingdom, European Union, and East Asian countries all use distinct numbering scales, which makes buying shoes internationally confusing without a reliable reference.

The US system uses a scale that starts at 1 for infants and runs into the teens for adults, with half sizes. Men's and women's US sizes use different scales — a women's US 9 is about 1.5 sizes smaller than a men's US 9 in actual foot length. The UK system is similar but offset by about half a size for men and two sizes for women.

The European (EU) system uses Paris Points, where each size represents 6.67mm of shoe length. EU sizes are gender-neutral — EU 42 is EU 42 whether it's a men's or women's shoe. This makes the EU system simpler in some ways, though it still doesn't tell you anything about width.

The CM (centimeter) and KR (Korean) systems are the most logical. They measure actual foot length directly. A 28 cm foot wears a size 280 in Korea. This “Mondopoint” approach is also used by NATO and the international standard ISO 9407 because it removes all ambiguity — your foot is exactly as long as it is.

Getting an accurate foot measurement is the single most important step in finding the right shoe size. Stand on a hard floor (not carpet) with a piece of paper and a pencil. Place your heel against a wall and mark the tip of your longest toe — which may be your second toe, not your big toe.

Measure from the edge of the paper to the mark in centimeters. This gives you your foot length, which maps directly to the CM column in the converter. Always measure both feet — most people have one foot that's slightly longer, sometimes by as much as half a size. Size to the larger foot.

Time of day matters too. Feet swell throughout the day from walking and gravity. Measuring in the late afternoon or evening gives a more realistic size for all-day comfort. If you measured first thing in the morning, consider going up a half size.

The average American man wears a US 10.5, up from 9.5 in the 1970s. This shift is partly due to increasing average height and weight, but also because modern sizing has become more generous — what was labeled a 10 decades ago might be labeled a 9.5 today (a phenomenon called “vanity sizing”).

Shoe sizing can vary by up to a full size between brands. Nike tends to run slightly small, Adidas slightly narrow, and New Balance offers the widest range of width options. When shopping online from international brands, always check the brand's specific size chart rather than relying solely on a generic converter.

Children's sizing is particularly confusing because kids outgrow shoes every few months. The US kids' scale resets at size 1 when transitioning from toddler to youth sizes. European kids' sizes run continuously from about EU 16 (infant) to EU 31 (youth), which makes tracking growth simpler.

This converter shows all sizing systems simultaneously. Enter a size in any system and instantly see the equivalents in US, UK, EU, CM, and Korean sizing. No clicking through dropdowns or submitting forms — results update in real-time as you type.

The full conversion tables cover the complete range for men's (US 6–15), women's (US 4–12), and kids' (US 1–13) sizes. The currently selected size is highlighted in the table for easy reference. You can use the table to compare multiple sizes at a glance or verify a conversion.

The foot measurement guide and width sizing reference help you go beyond just length. A shoe that's the right length but the wrong width will still be uncomfortable — and width is where most people make mistakes when buying shoes online.