US to EU Women's Shoe Size Conversion

Why the numbers don't line up cleanly

US women's shoe sizes climb in half-size steps (7, 7.5, 8) built around a different last-measuring tradition than the one EU sizes use. EU sizing descends from the French Paris-point system, where each point is two-thirds of a centimetre of last length — a unit the US scale has never touched. That's why a US 8 lands on a EU 39 rather than a tidier-looking number: the two scales were never designed to share a ratio, they're being translated, not relabeled.

The practical effect is that the jump from one US half-size to the next doesn't always correspond to a full EU point. Some EU factories only cut certain Paris-point sizes for a given last, so a shoe stamped EU 38 from one factory can measure closer to a US 7 and, from a different factory's last, closer to a US 7.5 — the printed conversion is the average, not a guarantee for every specific shoe.

European lasts tend to run narrow

Separately from the size number, French and Italian women's lasts are commonly cut narrower through the midfoot than most US lasts. Someone who wears a true US 8 in an American brand and orders the EU-converted size in a European brand for the first time often finds the length correct but the shoe snug across the ball of the foot. That's a last-shape difference, not a sizing-table error, and it's common enough that sizing up half a EU size on a known-narrow European last is standard advice rather than a workaround.

What actually settles it

Because the table is an average across brands, the most reliable check for a US-to-EU purchase is your actual foot length in centimetres against that specific brand's own chart, not the US size printed on your usual shoebox. Brands that sell into both markets almost always publish a foot-length-in-cm column precisely because the size-number conversion alone isn't precise enough for a purchase you can't try on first.

Returns across borders cost more to get wrong

A converted size that's off by half a step is a minor annoyance domestically but a bigger one when ordering from a European retailer that ships internationally — return postage and customs handling on an international parcel can erase whatever you saved buying direct. If a European brand's own chart shows a range of foot lengths for a given EU size rather than a single number, and your foot sits near the boundary between two sizes, it's usually worth contacting the retailer before ordering rather than guessing, since a mis-sized international return is far more costly than a mis-sized domestic one.