👟 US to EU Shoe Size Converter

How to Use This Shoe Size Converter

Select men\'s or women\'s US sizing, enter your US size, and get EU, UK, and foot-length equivalents instantly. The chart covers the full adult range in half sizes.

The Conversion Rules

The chart behind the calculator uses standard manufacturer tables, not just the rough formulas, so half sizes land correctly. EU sizes step in two-thirds of a centimeter (one Paris point), which is why they look irregular next to US halves. Mondopoint, the cm-based system, is the most precise of all. When precision matters, foot length in centimeters beats every conversion, and trying shoes on beats centimeters.

Worked Example

Men\'s US 9: UK 8, EU 42.5, foot about 27 cm. Women\'s US 9: UK 7, EU 40.5, foot about 25.7 cm. Notice the same US number means different feet by gender, which is why the gender selector matters. Ordering from a European site: take the EU number straight from the result; EU sizes are unisex, so no further conversion is needed.

Kids\' Shoe Sizing

Kids\' sizes run on separate scales: US kids 13 equals about EU 31, and youth sizes bridge into adult smalls. Measure kids\' feet every few months; they outgrow shoes faster than the uppers wear out. Leave a thumb\'s width, about half an inch, of growing room. Convert kids\' US to EU with the brand\'s chart, since the adult formulas do not apply below US 6.

Measuring Your Feet Right

Measure heel to longest toe in centimeters; use the larger foot. Do it in the afternoon, since feet swell through the day by up to half a size. Compare the cm number to the brand\'s chart, not to your usual size. Trace the outline and keep it in your wallet or phone; shoe shopping without measuring becomes guesswork. This one habit eliminates most online shoe returns.

Ordering Shoes Online

Online ordering works when you lead with centimeters. Filter by your EU size, then check the brand\'s cm chart before adding to cart. Read three fit reviews and look for a consensus: "true to size" means buy your normal, "runs small" means size up. Order from retailers with free returns when trying a new brand. Keep the box until you have worn them indoors; most return policies require it.

Brand Variations

Conversions are starting points, not guarantees. Running brands often run small, dress brands narrow, and European makers true to EU cm. Read the fit reviews: "runs small, size up" appears on half the internet\'s shoe listings for a reason. Width matters as much as length; a D-width foot in a B-width shoe will never fit regardless of size. When a brand publishes its own cm chart, trust it over any converter, including this one.

Worked Example: The Marathon Shoe Order

A runner with 25.0 cm feet ordering from a European site. Women's US 8.5 converts to about EU 39.5 and 25.0 cm on most charts. Running shoes need a thumb's width of space ahead of the toes, roughly half an inch, because feet swell on long runs, so she orders EU 40 and checks the brand's own centimeter chart before paying. The EU number goes straight into the European checkout; no further conversion needed.

The return-shipping trap: European orders returned from the US can cost $30 or more, so one careful measurement beats two rushed orders. Measure both feet in the evening, use the larger, and when between EU sizes in running shoes, take the larger one.

Why EU Sizes Feel More Precise

EU sizes run on the Paris point: 2/3 of a centimeter, 6.67 mm, per full size, with half sizes at 3.33 mm steps. US half sizes step about 4.2 mm. The EU system's finer granularity means less rounding error between your foot and the size, which is why European shoppers argue less about fit.

The honest system underneath both is Mondopoint: foot length in millimeters, the ISO standard used for ski boots, military footwear, and Japanese sizing. A 260 Mondopoint boot fits a 26.0 cm foot, no conversion, no gender offset, no brand folklore. When a brand prints the centimeter or Mondopoint size, trust it over every converted number on the page.

The Half-Size Trap: When to Size Up

The most common online shoe mistake is ordering your measured size in a shoe built for a different job. Running shoes should be a half to a full size larger than your dress shoes: feet swell during a run, toes need room on downhills, and black toenails are the receipt for shoes bought too small. Hiking boots follow the same rule with thick socks factored in. Court shoes and everyday sneakers can stay closer to measured size, but never smaller.

Measure in the evening, standing, with the socks you will actually wear. Feet spread under body weight and swell through the day, so a morning barefoot measurement is the smallest your foot will ever be and the worst number to order from. Trace both feet and measure the longer one; most people have a half-size difference between feet, and shoes are bought for the bigger foot. The smaller foot adapts. The bigger one does not.

Wide Feet: The Letter System

Length is only half the fit; width is the other, and the US letter system is how you say it. For men, D is medium and E/2E is wide; for women, B is medium and D is wide. European sizing mostly ignores width, which is why a EU 42 can fit one foot perfectly and crush another: same length, different volume. If your toes splay, your forefoot spills over the sole, or you consistently size up for comfort, stop sizing up and start sizing wide.

Two traps to know. First, wide sizes vary more between brands than length does, so a 2E in one brand can feel like a D in another; reviews mentioning width are worth more than the size chart. Second, insoles and orthotics eat volume, so orthotic wearers often need a wide even with medium feet. Length gets you in the shoe. Width decides whether you stay.