Korea to US Women's Shoe Size Conversion

A millimetre figure meeting a scale that was never built to hold one

A Korean size like 235 states foot length directly in millimetres in 5mm steps, while the US scale climbs in arbitrary half sizes with no length unit behind the number at all — the practical result is that a single Korean size can straddle the boundary between two US half-sizes, since 5mm doesn't divide evenly into whatever length gap a US half-size step happens to represent for a given last.

Korean online retail has grown faster than its chart standardisation has

A large share of recent Western interest in Korean footwear has come through fast-growing online marketplaces and independent sellers rather than long-established department-store brands, and that newer seller base is noticeably less consistent about publishing a reliable millimetre chart than Japan's more established export-focused retailers. Read that specific seller's return policy before ordering — a young, fast-growing seller hasn't necessarily built the decades of international-sizing experience an established Japanese exporter has.

K-fashion’s slimmer cut affects the whole shoe, not just the length

Korean shoe design has leaned into a slimmer, lower-volume silhouette through the instep and vamp as a stylistic choice on top of any underlying last-shape difference, which is a separate effect from the length conversion itself — a foot that’s average width for its length in a US shoe can still feel noticeably constricted in a Korean shoe at the length-correct converted size.

Keep the millimetre figure, not the converted US number, as your reference

Since a US half-size is a rounded approximation of whatever millimetre figure the brand's last was built around, converting your Korean size to inches and comparing that directly against a specific US brand's own published foot-length column avoids stacking one rounding step on top of another.

None of this is unique to shoes bought while traveling — the same millimetre-first approach applies just as well to an online order shipped internationally, so keeping your measured foot length on hand is worth doing before any Korean footwear purchase, not just a first one.

If you're ordering more than one pair from the same Korean seller, note down which specific model ran true to your measured length and which one needed rounding up — an individual model's last can vary even within one brand's own catalogue.

That habit pays off most on a second or third order, once you've built up a small personal record of how two or three specific Korean brands actually run against your own measured foot length rather than the general regional pattern alone.