Shoe Size Converter

Because foot length is the one honest input: it's a physical measurement you can take with a ruler, and it works even if you have no idea what size you wear in EU, UK or US shoes. Any other shoe size is itself just an approximation of that length, filtered through one manufacturer's last, so starting from a size you already own would carry that manufacturer's guesswork into the conversion.

Stand on a sheet of paper with your heel against a wall, mark the wall-to-toe line at your longest toe, which for many people is not the big toe, then measure that line in cm or mm with a ruler. Do it standing, since feet spread slightly under weight. Measure in the evening: feet swell over the day and are at their largest then. Measure both feet and use the larger one, since they are rarely identical.

Because they are, and that's stated rather than hidden. A shoe is built on a last, a solid form that is longer than the foot it's meant to fit, to leave room for movement and the shoe's construction. How much longer differs from one manufacturer to the next, which is exactly why every size chart on the internet disagrees slightly with every other one. These numbers are a solid starting point, not a guarantee that a specific pair will fit.

US women's charts genuinely disagree with each other, not just here. This tool uses the common US retail scale, where US women's size equals US men's size plus 1.5. Some brands instead use the athletic convention of men's plus 1, a half size smaller. If a specific brand's chart doesn't match, that's the reason, not an error in this tool.

The larger number is your size snapped to the nearest half, which is the granularity shoes are actually sold in. The figure underneath is the unrounded value straight from the formula, before snapping, so it can fall slightly above or below the size shown, not just below it. If that exact value sits close to the boundary between two half sizes, you're between sizes and should try both.

No. The conversion is arithmetic that runs in your browser, so nothing you enter is sent to a server.