Shoe Size Chart — International Conversion Guide

Why Shoe Sizes Are So Confusing

There is no single international shoe size standard. The United States, United Kingdom, Europe, Japan, and China each use different sizing systems with different numbering, different increments, and different measurement starting points. A US men size 10 is a UK 9.5, a European 43, and a Japanese 28. These numbers bear no mathematical relationship to each other — they are separate systems that evolved independently in different countries over centuries.

To make matters worse, shoe sizes are not even consistent within a single system. A US size 10 from Nike may fit differently than a size 10 from Adidas, New Balance, or a dress shoe manufacturer. Each brand develops its own lasts (foot-shaped molds) with slightly different proportions. Width, arch height, toe box shape, and heel width all vary between brands and even between models from the same brand. The size number is a rough starting point for finding the right fit, not a precise specification.

How the Major Sizing Systems Work

The US sizing system uses the Brannock device scale, where each full size represents one-third of an inch in foot length. US men sizes start at 1 for a foot approximately 7.67 inches long. US women sizes are offset by approximately 1.5 sizes from men sizes — a women 8.5 is roughly equivalent to a men 7. Children sizes use the same scale but start over at size 1 when they reach approximately 8.5 inches (the youth-to-adult transition is around youth size 13.5 to adult size 1).

European sizes use the Paris Point system, where each size represents two-thirds of a centimeter. European sizes are unisex — a 43 is a 43 for everyone. The scale starts at size 0 for a foot length of 0 cm, which means adult sizes (typically 35 to 48) correspond to actual foot measurements in a more intuitive way than US sizes. Our Shoe Size Converter at miniconvert.com converts between all major sizing systems including half sizes and width variations.

Japanese sizes are the simplest — they represent the foot length in centimeters. A Japanese 27 is designed for a 27 cm foot. This direct measurement system is the most logical of all sizing systems, and some have advocated for its universal adoption, though cultural inertia has prevented this.

Measuring Your Feet Correctly

Feet change size throughout the day — they swell as you stand and walk, typically growing by half a size from morning to evening. Measure your feet in the afternoon or evening when they are at their largest. Stand while measuring (feet spread under body weight), measure both feet (most people have one foot slightly larger — always buy for the larger foot), and measure length from heel to longest toe.

Width matters as much as length but gets far less attention. Standard width is designated B for women and D for men. Narrow widths are A or AA (women) and B or C (men). Wide widths are D or E (women) and E or EE (men). If you consistently find shoes uncomfortable despite being the correct length, you likely need a different width. Many online retailers now offer width options that brick-and-mortar stores may not stock.

Children Shoe Sizing

Children feet grow rapidly — roughly one full size every 3 to 4 months for toddlers, slowing to about one size per year by school age. Buying shoes that are too large (to grow into) or too small (because they were fine last month) both cause problems. Too-large shoes cause tripping, blisters, and gait issues. Too-small shoes compress toes, causing ingrown toenails, bunions, and permanent structural changes in developing feet.

Check your child shoe fit monthly by pressing your thumb on the toe of the shoe while they stand — there should be about a thumb width of space between the longest toe and the end of the shoe. Children often cannot reliably tell you whether shoes fit because their nerve endings are still developing — they may say shoes feel fine even when they are too small. Physical checking is more reliable than asking.

Online Shopping and Size Charts

When buying shoes online, always check the brand specific size chart rather than relying on your usual size. Measure your foot in centimeters and compare directly to the chart measurements — this is more reliable than converting between sizing systems. Read reviews that mention sizing (runs large, runs narrow) to calibrate expectations. And buy from retailers with free returns, because even with perfect measurements, the only true test of fit is wearing the shoe and walking around.