Shoe size converter: EU, US, UK and centimeters in one place
You are shopping for shoes on a foreign site and you get stuck on the size chart. The seller lists "US 9", the label says "UK 8.5", the product description also mentions "260 mm": and you have no idea if those are all the same shoe or three different sizes.
You type one number you know: your usual EU 41, your 27 cm foot length, or the size from an American store. The calculator shows all the equivalents at once: EU, US, UK, foot length in centimeters, Japanese (JP), Chinese (CN), Korean (KR) and Australian (AU). Separately for women and men, because the same numbers mean different shoes depending on gender.
You also get a table of adjacent sizes (two on each side): if you are between sizes, you can see at a glance what to grab when in doubt. Below that, a section of brand notes: Nike runs half a size small, Birkenstock runs large, Asics running shoes feel tight in length. No more hopping between size-chart tabs, everything is right here.
How to use it
- Pick a gender: women, men, kids. The tables are different for each, the same EU 39 number means a different shoe for women versus men. For kids the calculator suggests switching to the dedicated kids tool (kids sizes jump faster because feet are growing).
- Pick what you are typing: EU (European number, the one on the label in most of continental Europe), US (American), UK (British) or cm (foot length in centimeters). You only need one of these numbers.
- Type the value in the box. The + and - buttons step by half a size (or 0.1 cm in cm mode). Most physical stores only stock full sizes, but the calculator shows half sizes too, because many brands offer them (especially in UK and US sizing).
- The result card instantly shows every other size: EU, US, UK, cm, JP (Japanese, in centimeters), CN (Chinese, in millimeters), KR (Korean, in millimeters) and AU (Australian). The value you typed is highlighted so you can see where the numbers came from.
- The table below shows 5 rows: 2 sizes smaller, your match, 2 sizes larger. Handy when your exact size is out of stock, you can immediately see the closest one to try.
- Check the "Brand notes" section: Nike, Adidas, Birkenstock, Asics, Vans and others fit differently. The quick cheat sheet tells you whether to go half a size up, half a size down, or stick with your normal number.
- If you do not know any of your sizes, open the "How to measure your foot" section at the bottom. 5 steps, paper, pencil, ruler. Measure in the evening: feet swell during the day and that is when you actually wear shoes.
When this is useful
Six typical situations where you do not want to guess your size:
- Shopping on a foreign online store. The site only shows sizes in US or UK, but you know your EU 41. You type EU 41 (men), see US 8 and UK 7.5. You click the right size, international returns are expensive, better to order the correct size from the start.
- Buying shoes from Asian marketplaces. Sellers list foot length in millimeters (for example 245 mm), because that is the local standard. You type 24.5 cm (women), see EU 39, US 8.5. Or the other way around: type your EU 39, see that it is 245 mm, click the "245" tag on the listing.
- Picking shoes for a partner or family member. You know your partner wears EU 43, but the US site only stocks US 10 of that model. You check: EU 43 (men) = US 10. Match, you buy. No awkward "what size are you again" texts.
- Traveling abroad. You are going to Japan or Korea and want to grab a pair of local sneakers. The shelves are labeled in cm (JP): 26.0, 26.5, 27.0. You type your EU 41 (men), see 26.0 cm, and ask for that exact pair.
- Your size fluctuates between brands. In one store you are EU 40, in another EU 41, in a third UK 6.5. You measure your foot with a ruler (see the "How to measure" section), get 26.0 cm, and the calculator confirms that is EU 41 women or EU 41 men depending on cut. Concrete numbers, no more guessing.
- Checking whether brand X "runs small or large". A review says "Nike running shoes run half a size small". Your normal is EU 39, in Nike take EU 39.5 (or EU 40). The "Brand notes" section collects these rules for major brands in one place, no need to dig through forums.