Footwear
Convert between US, UK, EU, and centimetre shoe sizes instantly.
Converted Sizes
9US
8.5UK
42.5EU
26.4cm
Conversions are approximate. Fit varies by brand and model.
All sizes for men size 9
Shoe sizes vary significantly between brands. Always try on or check brand-specific sizing charts before purchasing online.
A shoe size converter is a tool that translates shoe sizes between different regional standards. US, UK, EU, and metric (centimetre) sizes measure foot length differently and use different scales. The converter uses standard conversion tables for both men's and women's shoes, accounting for the fact that women's and men's sizing systems are offset from each other.
The converter uses a lookup table with standard shoe size equivalencies. Select your gender (men or women), enter your current shoe size, choose your current region, and the tool instantly displays the equivalent sizes in all other systems along with the foot length in centimetres. The converter finds the closest match in the standard size progression to provide the most accurate conversion.
Shoe size conversions are based on foot length in centimetres as the common reference. US Men size 9 = UK 8.5 = EU 42.5 = 26.4 cm foot length. US Women size 8 = UK 5.5 = EU 38 = 24.0 cm. The offset between men's and women's sizing is approximately 1.5 sizes in the US system.Shoe sizes reflect foot length: each full size (e.g., US 9 to US 10) represents approximately 0.4 centimetres of additional foot length. Men's and women's shoes have different base sizes even though they cover similar foot lengths. EU sizes are the most linear; they directly reflect foot length in millimetres minus 10 (e.g., EU 42.5 = 425 mm = 42.5 cm). This tool uses established size conversion matrices used by shoe manufacturers worldwide.
| Input | Result | Notes |
|---|---|---|
| US Men 9 | UK 8.5, EU 42.5, 26.4 cm | US Men 9 is the most common size for adult men; equivalent to a 26.4 cm foot length |
| EU 40 | US Men 7, UK 6.5, 24.8 cm (or US Women 9, UK 6.5, 24.8 cm) | EU 40 spans both men's size 7 and women's size 9, depending on the shoe type |
| US Women 7 | UK 4.5, EU 37, 23.2 cm | US Women 7 is approximately 1.5 sizes smaller than US Men equivalent, due to different sizing bases |
US women's shoe sizes start from a different baseline than men's. Roughly, US Women's size = US Men's size + 1.5. This is arbitrary but widely used; other countries use a unified scale or smaller offsets.
EU sizing is more standardized than US, but still varies. Italian brands often run narrow, while other European brands are wider. Always measure your foot length and check the specific brand's sizing chart.
The centimetre measurement is your foot length from heel to longest toe, typically measured while standing. It's the most universal measurement and the most reliable for choosing the correct size.
This converter is designed for adult shoe sizes. Children's sizing varies by brand and doesn't follow the same progression. Check your child's age and foot length against the brand's specific chart.
Always round up (buy the larger size). A slightly loose shoe can be remedied with thicker socks or insoles; too-small shoes cause discomfort and foot problems. Measure your foot length first to be sure.
Manufacturing location and target market influence fit. A Nike shoe made in Vietnam may fit slightly differently from the same model made in China. Check customer reviews before ordering.