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Shoe Size Converter

Free shoe size converter: translate US, UK and EU shoe sizes for men and women via foot length in cm and inches. Brand-independent estimates, runs in your browser.

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Deep dive guides

A LITTLE CONTEXT · 3 MIN READShoe Size Systems Explained
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  • Shoe Size Systems Explained — Foot length, lasts and the US, UK and EU scales — why no shoe size chart is universal and how to convert without getting burned.

How shoe size converter works

Every shoe sizing system is a slightly different ruler over the same foot. This converter anchors everything on foot length — the one measurement that survives across brands — using the standard published formulas: US men's size is 3 × foot length in inches − 22, the women's US scale runs the same ruler one size up (− 21), UK sizes sit one below US men's and two below US women's, and the European Paris-point system sizes 1.5 × (foot length in cm + 2 cm toe allowance).

Enter a size in any of the six combinations (US/UK/EU × men/women) and the tool inverts that system's formula to recover the foot length, then applies the other systems' formulas forward. The result shows the estimated foot length in centimetres and inches plus all six target sizes, so a US men's 9 reads out as roughly a 26.2 cm foot, UK 8, EU 42.4 and US women's 10.

The output is deliberately framed as estimates: brands offset their lasts by half a size or more in every direction, and the men's-to-women's offset is quoted as both 1 and 1.5 sizes by different makers. The numbers here match the widely published conversion charts, which is exactly what a cross-brand shopping trip needs — a starting point to confirm against each brand's own size chart when the purchase matters.

Frequently asked questions

How do I convert US shoe size to EU?
The common men's approximation is US + 33 (a US 9 ≈ EU 42) and women's US + 30.5, but the honest method works from foot length: EU size = 1.5 × (foot length in cm + 2). This tool does the full conversion both ways and shows the foot length it used, so you can sanity-check the result against a ruler.
What is the difference between men's and women's sizes?
They use different scales over the same feet. In this tool's model, a woman's US size is one number above a man's for the same foot length (a 26.2 cm foot is US men's 9 and US women's 10), and UK women's runs two below US women's. EU sizes are nominally unisex but branded charts for men and women still differ, so both are shown.
How do I measure my foot length?
Stand on a piece of paper against a wall, mark the tip of your longest toe, and measure from the wall to the mark in centimetres — do it at the end of the day when feet are longest, and measure both feet using the larger. Then pick the system you know a size in, enter it, and check that the foot length the tool reports matches your measurement before trusting the other systems.
Why do shoe sizes differ between brands?
Brands build shoes on lasts — the foot-shaped forms that define the fit — and each brand's lasts drift from the nominal standard by half a size or more, sometimes differently between that brand's own models. There is no enforced international standard, which is why every conversion, including this one, is an estimate. Use the foot length as the stable reference and confirm against the brand's chart for expensive purchases.
Is EU size 42 the same for men and women?
In this tool's foot-length model, yes: the EU Paris-point formula does not distinguish sex, so a 26.2 cm foot is EU 42.4 regardless. In practice many brands scale women's EU sizes slightly differently, which is why the result lists separate EU columns for men's and women's inputs even though both derive from the same foot length.

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