Shoe Size Converter (US / UK / EU / CM)

Pick men's or women's, enter your size in any system (US, UK, EU, or foot length in cm / Mondopoint), and the converter snaps to the closest standard row and shows the equivalent sizes in every other system. The full reference chart stays visible underneath with your match highlighted, so you can also eyeball half-size spreads at a glance. The CM column is true foot length — measure heel-to-longest-toe, not insole.

The centimetre column is the only one that means anything physical, and that is why it is the column to trust. US, UK and EU numbers are scale positions rather than measurements: a US 9 is not nine of anything, and the three scales use different starting points and different step sizes, so the arithmetic between them never lands exactly. Every conversion table is a set of nearest matches, which is why the same foot can map to two adjacent sizes depending on which chart you read.

The UK and US scales differ by a constant offset for men and a different one for women, which is where cross-gender conversion goes wrong. A women's US size is not a men's US size, and the gap between them is not the same gap as between UK and US. Converting twice through the wrong pair compounds the error into a full size.

European sizes are measured in Paris points, two thirds of a centimetre each, so a single EU step is about 6.7 mm while a half size in the US or UK is about 4.2 mm. The scales do not have the same granularity, so some US half sizes have no EU equivalent and get rounded to the nearest whole, which is why a conversion can round-trip to a different number than it started from.

None of this accounts for the last, which is the shape of the mould a shoe is built on. Two pairs of the same stated size from different manufacturers differ by a noticeable amount, and a brand that runs narrow or short is a fact about that brand rather than about the size system. Measure your foot, use the centimetre column as the anchor, and treat the rest as a starting point for trying shoes on.