Shoe Size Converter (US/EU/UK)
Enter a size you already know — US, UK, EU, or a measured foot length in centimetres — and see every equivalent for men’s or women’s sizing.
Size equivalents
Why the conversion is an estimate
The US, UK, and EU shoe-size systems each grew out of a different measuring tradition, so converting between them is a well-established approximation rather than an exact one-to-one mapping. This tool uses the common reference points — a men’s US 9 lining up with a UK 8.5, an EU 42, and a foot length of about 27cm, and a women’s US 8 lining up with a UK 6, an EU 39, and about 24.5cm — and scales linearly from there.
Because real shoes are cut on a specific last, two brands labelled the same size can still fit differently. Use the conversion to know roughly what to order, then check the specific brand’s own chart before you commit, particularly when buying online without trying the shoe on first.
Frequently Asked Questions
Why don't US, UK, and EU sizes just line up with a single offset?
They come from three different measuring traditions. The UK system counts in barleycorns (1/3 inch) starting from a child's last, the US system uses the same barleycorn step but starts counting from a different zero point, and the EU (Paris point) system counts in 2/3-centimetre steps from a French shoemaking standard. The result is that each system moves by a different-sized 'click' as the shoe gets bigger, so the gap between them isn't perfectly constant across every size — this tool uses the widely published approximate offsets, which are accurate for most adult sizes.
Why is the men's-to-women's conversion not just a fixed number either?
Women's lasts are typically narrower and shaped differently through the heel than men's lasts of the 'same' size, on top of the numbering offset (US women's is roughly US men's plus 1.5 to 2). Some brands publish a men's/women's conversion for their own shoes and others don't, so treat a cross-gender conversion as a rough starting point, not a guarantee of fit.
How should I measure my foot length at home?
Stand on a piece of paper against a wall, mark the tip of your longest toe and the back of your heel, and measure the distance between the marks in centimetres. Measure both feet in the evening, when feet are at their largest, and use the bigger of the two measurements.
My measured size doesn't match the number I usually buy — why?
Brands cut shoes on different lasts, so a size 9 running shoe and a size 9 dress shoe from different makers can differ by up to a full size in true length and width. Use this converter to get in the right neighborhood, then check the specific brand's own size chart before you buy, especially online.
General estimate only, not a professional fitting assessment. Sizing varies by brand and last — always check the brand’s own size chart before buying.