You find the perfect blazer from a French boutique. The shoes? Italian leather, listed as “EU 42”. Your favorite Japanese brand runs in centimeters. And somewhere between a US 8 and a UK 10, you’ve probably guessed — and guessed wrong. Size conversion shouldn't be a gamble. Whether you're shopping cross‑border or just tired of returns, understanding international sizing is the secret to a seamless wardrobe.
I’ve spent more time than I’d like to admit with measuring tapes and return labels. That’s why I started relying on a straightforward clothing & shoe size converter that does the math instantly. But before you click away, let’s break down the actual differences — because once you see the patterns, you’ll never second-guess a size tag again.
There’s no universal standard. A US women’s 8 is roughly a UK 10, an EU 38, and a Japanese 11 — but vanity sizing, brand quirks, and even the type of garment shift the numbers. Men’s shirts? A 15.5" collar in the US might be labeled 39 in Europe (centimeters) and “M” in Asia. And let’s not start on kids’ sizes.
Shoes are even trickier: a US men’s 9 equals a UK 8, EU 42, and about 27 cm in Japan. But the difference between a US women’s 8 and a men’s 7 is just 1.5 sizes — and many unisex sneaker brands use men’s sizing as default. It’s no wonder that nearly 30% of online clothing returns are due to poor fit.
| US | UK | EU | IT | JP |
|---|---|---|---|---|
| 4 | 8 | 34 | 40 | 7 |
| 6 | 10 | 36 | 42 | 9 |
| 8 | 12 | 38 | 44 | 11 |
| 10 | 14 | 40 | 46 | 13 |
| 12 | 16 | 42 | 48 | 15 |
While memorizing a few benchmarks helps, you don't need to keep a cheat sheet. This size converter covers dresses, jeans, shoes, rings, and more — from US/UK/EU to Australian, Chinese, and even Korean sizes. You enter what you know, and it returns every equivalent. It’s like having a multilingual tailor in your pocket.
Instead of switching between six tabs and second‑guessing if a “42” is Italian or French, just pick your category and see all relevant sizes at once. It works for men, women, and kids — and even handles those confusing unisex footwear shifts.
Open the size converterAlways updated · no signup needed
European shoe sizes are based on the “Paris point” (⅔ cm), while the UK and US systems use barleycorn increments. That’s why a EU 42 is not exactly a US 9 — it’s closer to a 9.5 in some brands. And if you’re buying from Japan, you’ll see the foot length in centimeters (e.g., 27.0 cm). The converter I mentioned (right here) shows you the precise foot length alongside the sizes, which is a lifesaver for online sneaker drops.
| US | UK | EU | CM (JP) |
|---|---|---|---|
| 8 | 7 | 41 | 26 |
| 9 | 8 | 42 | 27 |
| 10 | 9 | 43 | 28 |
| 11 | 10 | 44 | 29 |
Again, brands differ: an Italian 43 might be a US 10, but a French 43 is often a US 9.5. The easiest way to avoid the headache? Use a reliable converter before you hit “buy”.
Three seconds to clarity
I keep the size converter website bookmarked on my phone. While I’m in a fitting room abroad or browsing a European boutique online, I just tap, convert, and know exactly what fits. No more “maybe it’ll stretch”.
Even with perfect size conversion, remember that a French 38 in a tailored blazer fits differently than a slouchy linen dress. Always check the garment measurements if available (chest, waist, length). And when in doubt between two sizes? The converter can't tell you that — but it can at least give you the correct starting point.
One more thing: shoe width matters. US sizes often come in narrow (B), medium (D), wide (2E). European sizing is usually a standard width, but you might see “G” for wide in UK. Many advanced conversion tools let you factor in width, so keep that in mind.
Bookmark the converter — it’s free, fast, and covers more units than any department store chart.
You can find the full conversion suite at https://global-size-converter.vercel.app/ — yes, it’s that straightforward. No ads, no clutter — just the numbers you need, in every unit imaginable.
— never guess your size again.