Global Shoe Size Converter

No, US and UK sizes are not interchangeable and typically differ by at least one full size for adult males. A US men's size 10 is generally equivalent to a UK men's size 9, which can cause significant confusion for international shoppers. Women's sizing scales have different offsets, making it even more important to use a dedicated conversion tool before buying online. Our converter provides the most up-to-date mapping to ensure your new shoes fit comfortably the moment they arrive at your door.

To measure your foot, place it on a flat piece of paper and trace the outline while wearing the socks you intend to wear with the shoes. Measure the distance from the very back of your heel to the tip of your longest toe in either centimeters or inches. We recommend performing this measurement in the evening, as your feet tend to swell slightly throughout the day. Using this precise length measurement with our tool is much more reliable than guessing your size based on old pairs of shoes.

The EU shoe sizing system is based on the "Paris Point," which is exactly two-thirds of a centimeter (approximately 6.67mm). This means that a European size 42 corresponds to an internal shoe length of roughly 28 centimeters. This system is used across most of continental Europe and provides a very fine-grained scale for finding a precise fit. Our tool maps these metric-based EU sizes against the inch-based US and UK systems for a seamless global shopping experience. Understanding the underlying math can help you feel more confident when shopping from European brands.

Sizing can vary between manufacturers because each brand uses its own "last" (the physical mold of a foot) to design the internal shape of the shoe. Some brands, like Nike or Adidas, are known for running small or narrow, while others may offer a more generous "true to size" fit. While our tool provides an extremely accurate general guide, we always recommend checking the specific brand's own charts for high-performance footwear. Reading user reviews about how a particular model "runs" can also provide valuable context for your final purchase decision.

For children, feet should be measured every 2-3 months due to rapid growth, but even for adults, feet can change size over several years. Factors like weight gain, pregnancy, and aging can cause the arches of your feet to drop, potentially increasing your shoe size by a full half or whole size. If you haven't measured your feet in more than a year, it is a good idea to perform a fresh measurement before a major purchase. Ensuring you have the correct size is vital for preventing long-term foot pain and maintaining proper posture during daily activity.