The same foot wears three different numbers depending on which side of an ocean the shoe was sold on — US 8, UK 6, EU 39 for the same women’s shoe. This Shoe Size Conversion tool converts US men’s and women’s sizes to their UK and European equivalents instantly, from the standard conversion charts used across the industry, with the honest caveats about brand variation that every cross-border shoe buyer needs.





Worked Example: US Women’s 8

A US women’s 8 converts to UK 6 and EU 39 — the calculator’s default lookup, and the single most-ordered conversion in cross-border shoe shopping. The men’s chart runs on a different offset: a US men’s 9 is UK 8.5 and EU 42.5, and a US men’s 10 is UK 9.5, EU 44. The patterns beneath the numbers explain the systems’ quirks. UK sizes are built on the barleycorn — increments of 1/3 inch in last length — and start counting from a smaller base, which is why UK numbers sit lower than US for the same foot. US men’s and women’s scales are offset from each other by roughly 1.5 sizes (a men’s 8 approximates a women’s 9.5 in length) and by different width conventions, so never convert across the two charts by arithmetic: convert within the correct chart, as this page does. EU sizes use the Paris point (2/3 cm per size) counted along the last, which is why EU equivalents look large (39, 42.5) and step evenly where US/UK steps alternate half-size offsets — the EU column is often the most reliable cross-brand anchor precisely because it tracks length most directly. If your size lands between chart rows in any system, you are a half-size case there regardless of what your home chart calls you, and the fit guidance below matters more than the third decimal of any conversion.

The Standard Charts (and Why Brands Wander From Them)

The charts embedded in this calculator are the industry-consensus tables — the values major retailers publish when they must commit to one table. Women’s US → UK → EU runs: 5 → 3 → 35.5; 6 → 4 → 36.5; 7 → 5 → 38; 8 → 6 → 39; 9 → 7 → 40.5; 10 → 8 → 42; 11 → 9 → 43; 12 → 10 → 44.5. Men’s runs: 7 → 6.5 → 40; 8 → 7.5 → 41; 9 → 8.5 → 42.5; 10 → 9.5 → 44; 11 → 10.5 → 45; 12 → 11.5 → 46; 13 → 12.5 → 47.5. Three honest warnings accompany any chart. First, there is no single enforced international standard: the EU theoretically follows the Mondopoint-adjacent Paris-point system, but manufacturers assign their own conversions, and some brands’ EU 39 measures like another’s 39.5 — the chart is the center of the distribution, not a guarantee. Second, shoe type bends fit: running shoes are commonly bought a half to a full US size up (feet swell over distance), cycling and climbing shoes are fitted tight on purpose, and boots allow for thick socks — conversions give the size to start trying, not the size to blind-order in a category you wear differently. Third, width is invisible to every conversion chart: a wide foot in a standard-width foreign size is a wrong shoe at the right number, and brands mark width inconsistently (US letters, UK letters, EU usually silent). Measure your foot in centimetres (heel to longest toe, standing, evening) and treat any brand whose size guide lists centimetres as the tiebreaker — length in cm is the one number no marketing department redefines.

Shopping Across Borders Without Returns

The practical workflow this page supports: convert with the standard chart, then verify against the specific brand’s own size guide (which overrides the standard chart for that brand), then check the retailer’s notes for “runs small/large” intelligence, which experienced shoppers treat as a half-size adjustment signal. Order strategy follows from return economics: within your home market, a half-size bracket (both neighbours) with free returns is cheap insurance; internationally, where returns cost real money, the centimetre measurement against the brand’s cm column is the safer instrument, and unbranded marketplace sizing (notoriously optimistic) deserves a full size of skepticism. Children’s sizes are a separate universe (the UK and US both restart their numbering, and EU runs 16–39 continuously) and are deliberately excluded from this page’s charts — a child’s conversion from the adult tables would be wrong in a way that matters to small feet. Finally, keep your own record: once a brand fits you at a stated size, that empirical pair (your foot, their number) outranks every chart including this one, and a note in your phone — “Brand X EU 39 = perfect” — is the highest-quality conversion data you will ever own.

The Centimetre Method: Your Tiebreaker Measurement

Every conversion dispute ends the same way — with a measurement in centimetres, the one quantity in footwear that no relabelling can distort. The method takes two minutes. Stand in the socks you will wear with the shoes, full weight on the foot, in the evening when feet are at their daily largest. Trace or mark the heel’s back and the longest toe’s tip (not always the big toe) on a sheet of paper taped to a hard floor, then measure the distance. Work an example: a foot measuring 25.5 cm sits in the heart of the women’s mid-range — standard charts place it at about US women’s 8.5, UK 6.5, EU 39.5, and the calculator above confirms the 8.5 row at UK 6.5 / EU 39.5 exactly. The same 25.5 cm on the men’s side is a smaller size number entirely (a men’s US 7.5–8 territory), which is the whole reason this page forces a chart choice before converting. Three refinements separate a good measurement from a misleading one: measure both feet and size to the larger (a half-centimetre of asymmetry is normal and is a full half-size); add the shoe-type allowance in the shoe, not the measurement — the cm you bring to a brand’s guide should be your foot’s honest length, with their guide’s built-in ease doing the rest; and re-measure rather than trusting a size you settled years ago, because adult feet lengthen and widen slowly with age, mileage and pregnancy, and a conversion anchored to a stale home size replicates the staleness in three currencies at once.

Unisex Lines and the 1.5-Size Bridge

Unisex footwear has made one cross-chart conversion genuinely common: a style sold on the men’s scale being bought by a woman, or the reverse. The working bridge is that the two US scales are offset by about 1.5 sizes at equal foot length — a women’s US 9.5 is approximately a men’s US 8 in length — so convert by measuring against the target chart rather than by habit: find your size in your usual chart, take its EU equivalent (the length-anchored column), then read across to the other chart’s row carrying that same EU number. The calculator supports exactly this two-hop route: convert your women’s size to EU, then enter men’s sizes until the same EU appears. Width remains the bridge’s toll — men’s lasts are typically built wider at the same length, women’s narrower with a relatively narrower heel — so the length conversion is necessary but not sufficient, and unisex styles that publish a single chart with both US numbers are doing you a documented favour worth trusting over any improvised arithmetic, including this paragraph’s.

Common Mistakes

Converting men’s to women’s (or the reverse) by sliding along one chart — the scales differ in offset and width, not just labels. Assuming the EU number is inflated and sizing down: EU numbers are larger because the unit is smaller, not because the shoes are. Blind-ordering performance footwear at street-shoe conversions. Ignoring that UK sizes for women run about 2 below US (US 8 = UK 6) while men’s run about 0.5 below (US 9 = UK 8.5) — mixing the two rules is the classic conversion injury. And trusting a single chart for a brand you have never worn, without the centimetre cross-check.

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Frequently Asked Questions

What is a US 8 in UK and EU sizes?

Women’s US 8 = UK 6 = EU 39. Men’s US 8 = UK 7.5 = EU 41. Always convert within the correct chart — the men’s and women’s scales have different offsets.

What is a US men’s 9 in European sizes?

EU 42.5 (and UK 8.5). Men’s 10 is EU 44; men’s 11 is EU 45. Half steps in US/UK often land on whole or half EU sizes because the EU unit (the Paris point) is finer.

Why do conversions differ between brands?

No enforced global standard exists — each manufacturer maps its lasts onto the three scales itself, and fit philosophy (snug vs roomy) shifts the mapping. Use the standard chart here as the starting point and the brand’s own guide, especially its centimetre column, as the final word.

Should I size up for running shoes?

Commonly a half to a full US size above your street size, because feet swell over distance and toes need striking room. Convert your running size (not your street size) with the chart, then confirm with the brand’s guidance for that model.

How do I measure my foot for conversions?

Stand on paper in the evening, mark heel and longest toe, measure in centimetres. That length is your anchor across every system — most brands publish the cm their sizes fit, and cm cannot be relabelled.

Are children’s sizes covered by these charts?

No. Children’s numbering restarts in the US and UK and runs differently in the EU. Use a dedicated children’s chart for kids’ shoes — applying the adult tables would give wrong results.