Uniqlo size guide
Uniqlo sizing runs about one full size smaller than standard US or EU sizing. A Uniqlo Large fits closer to a US or EU Medium.
How the offset works
| If you usually wear (US) | Try in Uniqlo |
|---|---|
| XS | S |
| S | M |
| M | L |
| L | XL |
| If you usually wear (EU, women's) | Try in Uniqlo |
|---|---|
| EU 36 (S) | M |
| EU 38 (M) | L |
| EU 40 (L) | XL |
Why this happens
Uniqlo's size block originates from Japanese Industrial Standard (JIS) body measurements, which run smaller on average than US or European sizing standards. The label letters (S, M, L) stayed the same across markets, but the actual garment measurements behind each letter are cut to the Japanese scale — so the same letter means a smaller garment than the equivalent letter at a US or European retailer.
Convert your size
Start from your usual US, UK or EU size using our US/UK/EU size guide, then size up one for Uniqlo.
This is an independent, unaffiliated reference based on widely reported customer experience and the brand's own published sizing. Not officially associated with or endorsed by the brand. Fit varies by garment and collection — always check the specific product's measurements.
Frequently asked questions
Does Uniqlo run small?
Yes — Uniqlo uses Japanese-origin sizing, which runs about one full size smaller than standard US or EU sizing.
What US size is a Uniqlo Large?
Roughly a US Medium.
Should I always size up at Uniqlo?
Sizing up one from your usual US or EU size is the commonly recommended starting point, though knitwear and relaxed styles are more forgiving.